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1.  Height and Breast Cancer Risk: Evidence From Prospective Studies and Mendelian Randomization 
Zhang, Ben | Shu, Xiao-Ou | Delahanty, Ryan J. | Zeng, Chenjie | Michailidou, Kyriaki | Bolla, Manjeet K. | Wang, Qin | Dennis, Joe | Wen, Wanqing | Long, Jirong | Li, Chun | Dunning, Alison M. | Chang-Claude, Jenny | Shah, Mitul | Perkins, Barbara J. | Czene, Kamila | Darabi, Hatef | Eriksson, Mikael | Bojesen, Stig E. | Nordestgaard, Børge G. | Nielsen, Sune F. | Flyger, Henrik | Lambrechts, Diether | Neven, Patrick | Wildiers, Hans | Floris, Giuseppe | Schmidt, Marjanka K. | Rookus, Matti A. | van den Hurk, Katja | de Kort, Wim L. A. M. | Couch, Fergus J. | Olson, Janet E. | Hallberg, Emily | Vachon, Celine | Rudolph, Anja | Seibold, Petra | Flesch-Janys, Dieter | Peto, Julian | dos-Santos-Silva, Isabel | Fletcher, Olivia | Johnson, Nichola | Nevanlinna, Heli | Muranen, Taru A. | Aittomäki, Kristiina | Blomqvist, Carl | Li, Jingmei | Humphreys, Keith | Brand, Judith | Guénel, Pascal | Truong, Thérèse | Cordina-Duverger, Emilie | Menegaux, Florence | Burwinkel, Barbara | Marme, Frederik | Yang, Rongxi | Surowy, Harald | Benitez, Javier | Zamora, M. Pilar | Perez, Jose I. A. | Cox, Angela | Cross, Simon S. | Reed, Malcolm W. R. | Andrulis, Irene L. | Knight, Julia A. | Glendon, Gord | Tchatchou, Sandrine | Sawyer, Elinor J. | Tomlinson, Ian | Kerin, Michael J. | Miller, Nicola | Chenevix-Trench, Georgia | Haiman, Christopher A. | Henderson, Brian E. | Schumacher, Fredrick | Marchand, Loic Le | Lindblom, Annika | Margolin, Sara | Hooning, Maartje J. | Martens, John W. M. | Tilanus-Linthorst, Madeleine M. A. | Collée, J. Margriet | Hopper, John L. | Southey, Melissa C. | Tsimiklis, Helen | Apicella, Carmel | Slager, Susan | Toland, Amanda E. | Ambrosone, Christine B. | Yannoukakos, Drakoulis | Giles, Graham G. | Milne, Roger L. | McLean, Catriona | Fasching, Peter A. | Haeberle, Lothar | Ekici, Arif B. | Beckmann, Matthias W. | Brenner, Hermann | Dieffenbach, Aida Karina | Arndt, Volker | Stegmaier, Christa | Swerdlow, Anthony J. | Ashworth, Alan | Orr, Nick | Jones, Michael | Figueroa, Jonine | Garcia-Closas, Montserrat | Brinton, Louise | Lissowska, Jolanta | Dumont, Martine | Winqvist, Robert | Pylkäs, Katri | Jukkola-Vuorinen, Arja | Grip, Mervi | Brauch, Hiltrud | Brüning, Thomas | Ko, Yon-Dschun | Peterlongo, Paolo | Manoukian, Siranoush | Bonanni, Bernardo | Radice, Paolo | Bogdanova, Natalia | Antonenkova, Natalia | Dörk, Thilo | Mannermaa, Arto | Kataja, Vesa | Kosma, Veli-Matti | Hartikainen, Jaana M. | Devilee, Peter | Seynaeve, Caroline | Van Asperen, Christi J. | Jakubowska, Anna | Lubiński, Jan | Jaworska-Bieniek, Katarzyna | Durda, Katarzyna | Hamann, Ute | Torres, Diana | Schmutzler, Rita K. | Neuhausen, Susan L. | Anton-Culver, Hoda | Kristensen, Vessela N. | Grenaker Alnæs, Grethe I. | Pierce, Brandon L. | Kraft, Peter | Peters, Ulrike | Lindstrom, Sara | Seminara, Daniela | Burgess, Stephen | Ahsan, Habibul | Whittemore, Alice S. | John, Esther M. | Gammon, Marilie D. | Malone, Kathleen E. | Tessier, Daniel C. | Vincent, Daniel | Bacot, Francois | Luccarini, Craig | Baynes, Caroline | Ahmed, Shahana | Maranian, Mel | Healey, Catherine S. | González-Neira, Anna | Pita, Guillermo | Alonso, M. Rosario | Álvarez, Nuria | Herrero, Daniel | Pharoah, Paul D. P. | Simard, Jacques | Hall, Per | Hunter, David J. | Easton, Douglas F. | Zheng, Wei
Background:
Epidemiological studies have linked adult height with breast cancer risk in women. However, the magnitude of the association, particularly by subtypes of breast cancer, has not been established. Furthermore, the mechanisms of the association remain unclear.
Methods:
We performed a meta-analysis to investigate associations between height and breast cancer risk using data from 159 prospective cohorts totaling 5216302 women, including 113178 events. In a consortium with individual-level data from 46325 case patients and 42482 control subjects, we conducted a Mendelian randomization analysis using a genetic score that comprised 168 height-associated variants as an instrument. This association was further evaluated in a second consortium using summary statistics data from 16003 case patients and 41335 control subjects.
Results:
The pooled relative risk of breast cancer was 1.17 (95% confidence interval [CI] = 1.15 to 1.19) per 10cm increase in height in the meta-analysis of prospective studies. In Mendelian randomization analysis, the odds ratio of breast cancer per 10cm increase in genetically predicted height was 1.22 (95% CI = 1.13 to 1.32) in the first consortium and 1.21 (95% CI = 1.05 to 1.39) in the second consortium. The association was found in both premenopausal and postmenopausal women but restricted to hormone receptor–positive breast cancer. Analyses of height-associated variants identified eight new loci associated with breast cancer risk after adjusting for multiple comparisons, including three loci at 1q21.2, DNAJC27, and CCDC91 at genome-wide significance level P < 5×10–8.
Conclusions:
Our study provides strong evidence that adult height is a risk factor for breast cancer in women and certain genetic factors and biological pathways affecting adult height have an important role in the etiology of breast cancer.
doi:10.1093/jnci/djv219
PMCID: PMC4643630  PMID: 26296642
2.  Breast cancer risk variants at 6q25 display different phenotype associations and regulate ESR1, RMND1 and CCDC170 
Dunning, Alison M | Michailidou, Kyriaki | Kuchenbaecker, Karoline B | Thompson, Deborah | French, Juliet D | Beesley, Jonathan | Healey, Catherine S | Kar, Siddhartha | Pooley, Karen A | Lopez-Knowles, Elena | Dicks, Ed | Barrowdale, Daniel | Sinnott-Armstrong, Nicholas A | Sallari, Richard C | Hillman, Kristine M | Kaufmann, Susanne | Sivakumaran, Haran | Marjaneh, Mahdi Moradi | Lee, Jason S | Hills, Margaret | Jarosz, Monika | Drury, Suzie | Canisius, Sander | Bolla, Manjeet K | Dennis, Joe | Wang, Qin | Hopper, John L | Southey, Melissa C | Broeks, Annegien | Schmidt, Marjanka K | Lophatananon, Artitaya | Muir, Kenneth | Beckmann, Matthias W | Fasching, Peter A | dos-Santos-Silva, Isabel | Peto, Julian | Sawyer, Elinor J | Tomlinson, Ian | Burwinkel, Barbara | Marme, Frederik | Guénel, Pascal | Truong, Thérèse | Bojesen, Stig E | Flyger, Henrik | González-Neira, Anna | Perez, Jose I A | Anton-Culver, Hoda | Eunjung, Lee | Arndt, Volker | Brenner, Hermann | Meindl, Alfons | Schmutzler, Rita K | Brauch, Hiltrud | Hamann, Ute | Aittomäki, Kristiina | Blomqvist, Carl | Ito, Hidemi | Matsuo, Keitaro | Bogdanova, Natasha | Dörk, Thilo | Lindblom, Annika | Margolin, Sara | Kosma, Veli-Matti | Mannermaa, Arto | Tseng, Chiu-chen | Wu, Anna H | Lambrechts, Diether | Wildiers, Hans | Chang-Claude, Jenny | Rudolph, Anja | Peterlongo, Paolo | Radice, Paolo | Olson, Janet E | Giles, Graham G | Milne, Roger L | Haiman, Christopher A | Henderson, Brian E | Goldberg, Mark S | Teo, Soo H | Yip, Cheng Har | Nord, Silje | Borresen-Dale, Anne-Lise | Kristensen, Vessela | Long, Jirong | Zheng, Wei | Pylkäs, Katri | Winqvist, Robert | Andrulis, Irene L | Knight, Julia A | Devilee, Peter | Seynaeve, Caroline | Figueroa, Jonine | Sherman, Mark E | Czene, Kamila | Darabi, Hatef | Hollestelle, Antoinette | van den Ouweland, Ans M W | Humphreys, Keith | Gao, Yu-Tang | Shu, Xiao-Ou | Cox, Angela | Cross, Simon S | Blot, William | Cai, Qiuyin | Ghoussaini, Maya | Perkins, Barbara J | Shah, Mitul | Choi, Ji-Yeob | Kang, Daehee | Lee, Soo Chin | Hartman, Mikael | Kabisch, Maria | Torres, Diana | Jakubowska, Anna | Lubinski, Jan | Brennan, Paul | Sangrajrang, Suleeporn | Ambrosone, Christine B | Toland, Amanda E | Shen, Chen-Yang | Wu, Pei-Ei | Orr, Nick | Swerdlow, Anthony | McGuffog, Lesley | Healey, Sue | Lee, Andrew | Kapuscinski, Miroslav | John, Esther M | Terry, Mary Beth | Daly, Mary B | Goldgar, David E | Buys, Saundra S | Janavicius, Ramunas | Tihomirova, Laima | Tung, Nadine | Dorfling, Cecilia M | van Rensburg, Elizabeth J | Neuhausen, Susan L | Ejlertsen, Bent | Hansen, Thomas V O | Osorio, Ana | Benitez, Javier | Rando, Rachel | Weitzel, Jeffrey N | Bonanni, Bernardo | Peissel, Bernard | Manoukian, Siranoush | Papi, Laura | Ottini, Laura | Konstantopoulou, Irene | Apostolou, Paraskevi | Garber, Judy | Rashid, Muhammad Usman | Frost, Debra | Izatt, Louise | Ellis, Steve | Godwin, Andrew K | Arnold, Norbert | Niederacher, Dieter | Rhiem, Kerstin | Bogdanova-Markov, Nadja | Sagne, Charlotte | Stoppa-Lyonnet, Dominique | Damiola, Francesca | Sinilnikova, Olga M | Mazoyer, Sylvie | Isaacs, Claudine | Claes, Kathleen B M | De Leeneer, Kim | de la Hoya, Miguel | Caldes, Trinidad | Nevanlinna, Heli | Khan, Sofia | Mensenkamp, Arjen R | Hooning, Maartje J | Rookus, Matti A | Kwong, Ava | Olah, Edith | Diez, Orland | Brunet, Joan | Pujana, Miquel Angel | Gronwald, Jacek | Huzarski, Tomasz | Barkardottir, Rosa B | Laframboise, Rachel | Soucy, Penny | Montagna, Marco | Agata, Simona | Teixeira, Manuel R | Park, Sue Kyung | Lindor, Noralane | Couch, Fergus J | Tischkowitz, Marc | Foretova, Lenka | Vijai, Joseph | Offit, Kenneth | Singer, Christian F | Rappaport, Christine | Phelan, Catherine M | Greene, Mark H | Mai, Phuong L | Rennert, Gad | Imyanitov, Evgeny N | Hulick, Peter J | Phillips, Kelly-Anne | Piedmonte, Marion | Mulligan, Anna Marie | Glendon, Gord | Bojesen, Anders | Thomassen, Mads | Caligo, Maria A | Yoon, Sook-Yee | Friedman, Eitan | Laitman, Yael | Borg, Ake | von Wachenfeldt, Anna | Ehrencrona, Hans | Rantala, Johanna | Olopade, Olufunmilayo I | Ganz, Patricia A | Nussbaum, Robert L | Gayther, Simon A | Nathanson, Katherine L | Domchek, Susan M | Arun, Banu K | Mitchell, Gillian | Karlan, Beth Y | Lester, Jenny | Maskarinec, Gertraud | Woolcott, Christy | Scott, Christopher | Stone, Jennifer | Apicella, Carmel | Tamimi, Rulla | Luben, Robert | Khaw, Kay-Tee | Helland, Åslaug | Haakensen, Vilde | Dowsett, Mitch | Pharoah, Paul D P | Simard, Jacques | Hall, Per | García-Closas, Montserrat | Vachon, Celine | Chenevix-Trench, Georgia | Antoniou, Antonis C | Easton, Douglas F | Edwards, Stacey L
Nature genetics  2016;48(4):374-386.
We analyzed 3,872 common genetic variants across the ESR1 locus (encoding estrogen receptor α) in 118,816 subjects from three international consortia. We found evidence for at least five independent causal variants, each associated with different phenotype sets, including estrogen receptor (ER+ or ER−) and human ERBB2 (HER2+ or HER2−) tumor subtypes, mammographic density and tumor grade. The best candidate causal variants for ER− tumors lie in four separate enhancer elements, and their risk alleles reduce expression of ESR1, RMND1 and CCDC170, whereas the risk alleles of the strongest candidates for the remaining independent causal variant disrupt a silencer element and putatively increase ESR1 and RMND1 expression.
doi:10.1038/ng.3521
PMCID: PMC4938803  PMID: 26928228
3.  Mammographic density and risk of breast cancer by mode of detection and tumor size: a case-control study 
Background
Risk of screen-detected breast cancer mostly reflects inherent risk, while risk of interval cancer reflects inherent risk and risk of masking (risk of the tumor not being detected due to increased dense tissue). Therefore the predictors of whether a breast cancer is interval or screen-detected include those that predict masking. Our aim was to investigate the associations between mammographic measures and (1) inherent risk, and (2) masking.
Methods
We conducted a case-control study nested within the Melbourne collaborative cohort study of 244 screen-detected cases (192 small tumors (<2 cm)) matched to 700 controls and 148 interval cases (76 small tumors) matched to 446 controls. Dense area (DA), percent dense area (PDA), and non-dense area (NDA) were measured using the Cumulus software. Conditional and unconditional logistic regression were applied as appropriate to estimate the odds per adjusted standard deviation (OPERA) adjusted for age and body mass index (BMI), allowing for the association with BMI to be a function of age at diagnosis. Tests of fit were performed using the Bayesian information criterion (BIC) and the area under the receiver operating characteristic curve.
Results
For screen-detected cancer, the association with BMI had a marginally significant dependence on age at diagnosis, and after adjustment both DA and PDA were associated with risk (OPERA approximately 1.2) and gave a similar fit. NDA was not associated with risk. For interval cancer, the BMI risk association was not dependent on age at diagnosis and the best fitting model was PDA alone (OPERA = 2.24, 95 % confidence interval 1.75, 2.86). Prediction of interval versus screen-detected cancer was best achieved by PDA alone (OPERA = 1.76, 95 % confidence interval 1.39, 2.22) with no association with BMI. When the analysis was restricted to small tumors to reduce the influence of tumor growth, we obtained similar results.
Conclusions
Inherent breast cancer risk is predicted by BMI and DA or PDA, but not NDA. Masking is predicted by PDA, and not by BMI. Understanding risk and masking could help tailor mammographic screening.
Electronic supplementary material
The online version of this article (doi:10.1186/s13058-016-0722-4) contains supplementary material, which is available to authorized users.
doi:10.1186/s13058-016-0722-4
PMCID: PMC4912759  PMID: 27316945
Mammographic density; Breast cancer; Detection mode; Tumor size
4.  An investigation of gene-environment interactions between 47 newly identified breast cancer susceptibility loci and environmental risk factors 
Rudolph, Anja | Milne, Roger L. | Truong, Thérèse | Knight, Julia A. | Seibold, Petra | Flesch-Janys, Dieter | Behrens, Sabine | Eilber, Ursula | Bolla, Manjeet K. | Wang, Qin | Dennis, Joe | Dunning, Alison M. | Shah, Mitul | Munday, Hannah R. | Darabi, Hatef | Eriksson, Mikael | Brand, Judith S. | Olson, Janet | Vachon, Celine M. | Hallberg, Emily | Castelao, J. Esteban | Carracedo, Angel | Torres, Maria | Li, Jingmei | Humphreys, Keith | Cordina-Duverger, Emilie | Menegaux, Florence | Flyger, Henrik | Nordestgaard, Børge G. | Nielsen, Sune F. | Yesilyurt, Betul T. | Floris, Giuseppe | Leunen, Karin | Engelhardt, Ellen G. | Broeks, Annegien | Rutgers, Emiel J. | Glendon, Gord | Mulligan, Anna Marie | Cross, Simon | Reed, Malcolm | Gonzalez-Neira, Anna | Perez, José Ignacio Arias | Provenzano, Elena | Apicella, Carmel | Southey, Melissa C. | Spurdle, Amanda | Investigators, kConFab | Group, AOCS | Häberle, Lothar | Beckmann, Matthias W. | Ekici, Arif B. | Dieffenbach, Aida Karina | Arndt, Volker | Stegmaier, Christa | McLean, Catriona | Baglietto, Laura | Chanock, Stephen J. | Lissowska, Jolanta | Sherman, Mark E. | Brüning, Thomas | Hamann, Ute | Ko, Yon-Dschun | Orr, Nick | Schoemaker, Minouk | Ashworth, Alan | Kosma, Veli-Matti | Kataja, Vesa | Hartikainen, Jaana M. | Mannermaa, Arto | Swerdlow, Anthony | Giles, Graham G. | Brenner, Hermann | Fasching, Peter A. | Chenevix-Trench, Georgia | Hopper, John | Benítez, Javier | Cox, Angela | Andrulis, Irene L. | Lambrechts, Diether | Gago-Dominguez, Manuela | Couch, Fergus | Czene, Kamila | Bojesen, Stig E. | Easton, Doug F. | Schmidt, Marjanka K. | Guénel, Pascal | Hall, Per | Pharoah, Paul D. P. | Garcia-Closas, Montserrat | Chang-Claude, Jenny
A large genotyping project within the Breast Cancer Association Consortium (BCAC) recently identified 41 associations between single nucleotide polymorphisms (SNPs) and overall breast cancer (BC) risk. We investigated whether the effects of these 41 SNPs, as well as six SNPs associated with estrogen receptor (ER) negative BC risk are modified by 13 environmental risk factors for BC.
Data from 22 studies participating in BCAC were pooled, comprising up to 26,633 cases and 30,119 controls. Interactions between SNPs and environmental factors were evaluated using an empirical Bayes-type shrinkage estimator.
Six SNPs showed interactions with associated p-values (pint) <1.1×10−3. None of the observed interactions was significant after accounting for multiple testing. The Bayesian False Discovery Probability was used to rank the findings, which indicated three interactions as being noteworthy at 1% prior probability of interaction. SNP rs6828523 was associated with increased ER-negative BC risk in women ≥170cm (OR=1.22, p=0.017), but inversely associated with ER-negative BC risk in women <160cm (OR=0.83, p=0.039, pint=1.9×10−4). The inverse association between rs4808801 and overall BC risk was stronger for women who had had four or more pregnancies (OR=0.85, p=2.0×10−4), and absent in women who had had just one (OR=0.96, p=0.19, pint = 6.1×10−4). SNP rs11242675 was inversely associated with overall BC risk in never/former smokers (OR=0.93, p=2.8×10−5), but no association was observed in current smokers (OR=1.07, p=0.14, pint = 3.4×10−4).
In conclusion, recently identified breast cancer susceptibility loci are not strongly modified by established risk factors and the observed potential interactions require confirmation in independent studies.
doi:10.1002/ijc.29188
PMCID: PMC4289418  PMID: 25227710
gene-environment interaction; breast cancer; risk factor; genetic susceptibility
5.  Inherited variants in the inner centromere protein (INCENP) gene of the chromosomal passenger complex contribute to the susceptibility of ER-negative breast cancer 
Kabisch, Maria | Lorenzo Bermejo, Justo | Dünnebier, Thomas | Ying, Shibo | Michailidou, Kyriaki | Bolla, Manjeet K. | Wang, Qin | Dennis, Joe | Shah, Mitul | Perkins, Barbara J. | Czene, Kamila | Darabi, Hatef | Eriksson, Mikael | Bojesen, Stig E. | Nordestgaard, Børge G. | Nielsen, Sune F. | Flyger, Henrik | Lambrechts, Diether | Neven, Patrick | Peeters, Stephanie | Weltens, Caroline | Couch, Fergus J. | Olson, Janet E. | Wang, Xianshu | Purrington, Kristen | Chang-Claude, Jenny | Rudolph, Anja | Seibold, Petra | Flesch-Janys, Dieter | Peto, Julian | dos-Santos-Silva, Isabel | Johnson, Nichola | Fletcher, Olivia | Nevanlinna, Heli | Muranen, Taru A. | Aittomäki, Kristiina | Blomqvist, Carl | Schmidt, Marjanka K. | Broeks, Annegien | Cornelissen, Sten | Hogervorst, Frans B.L. | Li, Jingmei | Brand, Judith S. | Humphreys, Keith | Guénel, Pascal | Truong, Thérèse | Menegaux, Florence | Sanchez, Marie | Burwinkel, Barbara | Marmé, Frederik | Yang, Rongxi | Bugert, Peter | González-Neira, Anna | Benitez, Javier | Pilar Zamora, M. | Arias Perez, Jose I. | Cox, Angela | Cross, Simon S. | Reed, Malcolm W.R. | Andrulis, Irene L. | Knight, Julia A. | Glendon, Gord | Tchatchou, Sandrine | Sawyer, Elinor J. | Tomlinson, Ian | Kerin, Michael J. | Miller, Nicola | Haiman, Christopher A. | Schumacher, Fredrick | Henderson, Brian E. | Le Marchand, Loic | Lindblom, Annika | Margolin, Sara | Hooning, Maartje J. | Hollestelle, Antoinette | Kriege, Mieke | Koppert, Linetta B. | Hopper, John L. | Southey, Melissa C. | Tsimiklis, Helen | Apicella, Carmel | Slettedahl, Seth | Toland, Amanda E. | Vachon, Celine | Yannoukakos, Drakoulis | Giles, Graham G. | Milne, Roger L. | McLean, Catriona | Fasching, Peter A. | Ruebner, Matthias | Ekici, Arif B. | Beckmann, Matthias W. | Brenner, Hermann | Dieffenbach, Aida K. | Arndt, Volker | Stegmaier, Christa | Ashworth, Alan | Orr, Nicholas | Schoemaker, Minouk J. | Swerdlow, Anthony | García-Closas, Montserrat | Figueroa, Jonine | Chanock, Stephen J. | Lissowska, Jolanta | Goldberg, Mark S. | Labrèche, France | Dumont, Martine | Winqvist, Robert | Pylkäs, Katri | Jukkola-Vuorinen, Arja | Grip, Mervi | Brauch, Hiltrud | Brüning, Thomas | Ko, Yon-Dschun | Radice, Paolo | Peterlongo, Paolo | Scuvera, Giulietta | Fortuzzi, Stefano | Bogdanova, Natalia | Dörk, Thilo | Mannermaa, Arto | Kataja, Vesa | Kosma, Veli-Matti | Hartikainen, Jaana M. | Devilee, Peter | Tollenaar, Robert A.E.M. | Seynaeve, Caroline | Van Asperen, Christi J. | Jakubowska, Anna | Lubinski, Jan | Jaworska-Bieniek, Katarzyna | Durda, Katarzyna | Zheng, Wei | Shrubsole, Martha J. | Cai, Qiuyin | Torres, Diana | Anton-Culver, Hoda | Kristensen, Vessela | Bacot, François | Tessier, Daniel C. | Vincent, Daniel | Luccarini, Craig | Baynes, Caroline | Ahmed, Shahana | Maranian, Mel | Simard, Jacques | Chenevix-Trench, Georgia | Hall, Per | Pharoah, Paul D.P. | Dunning, Alison M. | Easton, Douglas F. | Hamann, Ute
Carcinogenesis  2015;36(2):256-271.
Summary
This is the first study investigating the contribution of inherited variants in core genes of the chromosomal passenger complex to breast cancer susceptibility. It was found that several INCENP variants are associated with the risk of ER-negative breast cancer in the European population.
The chromosomal passenger complex (CPC) plays a pivotal role in the regulation of cell division. Therefore, inherited CPC variability could influence tumor development. The present candidate gene approach investigates the relationship between single nucleotide polymorphisms (SNPs) in genes encoding key CPC components and breast cancer risk. Fifteen SNPs in four CPC genes (INCENP, AURKB, BIRC5 and CDCA8) were genotyped in 88 911 European women from 39 case-control studies of the Breast Cancer Association Consortium. Possible associations were investigated in fixed-effects meta-analyses. The synonymous SNP rs1675126 in exon 7 of INCENP was associated with overall breast cancer risk [per A allele odds ratio (OR) 0.95, 95% confidence interval (CI) 0.92–0.98, P = 0.007] and particularly with estrogen receptor (ER)-negative breast tumors (per A allele OR 0.89, 95% CI 0.83–0.95, P = 0.0005). SNPs not directly genotyped were imputed based on 1000 Genomes. The SNPs rs1047739 in the 3ʹ untranslated region and rs144045115 downstream of INCENP showed the strongest association signals for overall (per T allele OR 1.03, 95% CI 1.00–1.06, P = 0.0009) and ER-negative breast cancer risk (per A allele OR 1.06, 95% CI 1.02–1.10, P = 0.0002). Two genotyped SNPs in BIRC5 were associated with familial breast cancer risk (top SNP rs2071214: per G allele OR 1.12, 95% CI 1.04–1.21, P = 0.002). The data suggest that INCENP in the CPC pathway contributes to ER-negative breast cancer susceptibility in the European population. In spite of a modest contribution of CPC-inherited variants to the total burden of sporadic and familial breast cancer, their potential as novel targets for breast cancer treatment should be further investigated.
doi:10.1093/carcin/bgu326
PMCID: PMC4335262  PMID: 25586992
6.  Identification and characterization of novel associations in the CASP8/ALS2CR12 region on chromosome 2 with breast cancer risk 
Lin, Wei-Yu | Camp, Nicola J. | Ghoussaini, Maya | Beesley, Jonathan | Michailidou, Kyriaki | Hopper, John L. | Apicella, Carmel | Southey, Melissa C. | Stone, Jennifer | Schmidt, Marjanka K. | Broeks, Annegien | Van't Veer, Laura J. | Th Rutgers, Emiel J. | Muir, Kenneth | Lophatananon, Artitaya | Stewart-Brown, Sarah | Siriwanarangsan, Pornthep | Fasching, Peter A. | Haeberle, Lothar | Ekici, Arif B. | Beckmann, Matthias W. | Peto, Julian | Dos-Santos-Silva, Isabel | Fletcher, Olivia | Johnson, Nichola | Bolla, Manjeet K. | Wang, Qin | Dennis, Joe | Sawyer, Elinor J. | Cheng, Timothy | Tomlinson, Ian | Kerin, Michael J. | Miller, Nicola | Marmé, Frederik | Surowy, Harald M. | Burwinkel, Barbara | Guénel, Pascal | Truong, Thérèse | Menegaux, Florence | Mulot, Claire | Bojesen, Stig E. | Nordestgaard, Børge G. | Nielsen, Sune F. | Flyger, Henrik | Benitez, Javier | Zamora, M. Pilar | Arias Perez, Jose Ignacio | Menéndez, Primitiva | González-Neira, Anna | Pita, Guillermo | Alonso, M. Rosario | Álvarez, Nuria | Herrero, Daniel | Anton-Culver, Hoda | Brenner, Hermann | Dieffenbach, Aida Karina | Arndt, Volker | Stegmaier, Christa | Meindl, Alfons | Lichtner, Peter | Schmutzler, Rita K. | Müller-Myhsok, Bertram | Brauch, Hiltrud | Brüning, Thomas | Ko, Yon-Dschun | Tessier, Daniel C. | Vincent, Daniel | Bacot, Francois | Nevanlinna, Heli | Aittomäki, Kristiina | Blomqvist, Carl | Khan, Sofia | Matsuo, Keitaro | Ito, Hidemi | Iwata, Hiroji | Horio, Akiyo | Bogdanova, Natalia V. | Antonenkova, Natalia N. | Dörk, Thilo | Lindblom, Annika | Margolin, Sara | Mannermaa, Arto | Kataja, Vesa | Kosma, Veli-Matti | Hartikainen, Jaana M. | Wu, Anna H. | Tseng, Chiu-Chen | Van Den Berg, David | Stram, Daniel O. | Neven, Patrick | Wauters, Els | Wildiers, Hans | Lambrechts, Diether | Chang-Claude, Jenny | Rudolph, Anja | Seibold, Petra | Flesch-Janys, Dieter | Radice, Paolo | Peterlongo, Paolo | Manoukian, Siranoush | Bonanni, Bernardo | Couch, Fergus J. | Wang, Xianshu | Vachon, Celine | Purrington, Kristen | Giles, Graham G. | Milne, Roger L. | Mclean, Catriona | Haiman, Christopher A. | Henderson, Brian E. | Schumacher, Fredrick | Le Marchand, Loic | Simard, Jacques | Goldberg, Mark S. | Labrèche, France | Dumont, Martine | Teo, Soo Hwang | Yip, Cheng Har | Hassan, Norhashimah | Vithana, Eranga Nishanthie | Kristensen, Vessela | Zheng, Wei | Deming-Halverson, Sandra | Shrubsole, Martha J. | Long, Jirong | Winqvist, Robert | Pylkäs, Katri | Jukkola-Vuorinen, Arja | Kauppila, Saila | Andrulis, Irene L. | Knight, Julia A. | Glendon, Gord | Tchatchou, Sandrine | Devilee, Peter | Tollenaar, Robert A.E.M. | Seynaeve, Caroline | Van Asperen, Christi J. | García-Closas, Montserrat | Figueroa, Jonine | Lissowska, Jolanta | Brinton, Louise | Czene, Kamila | Darabi, Hatef | Eriksson, Mikael | Brand, Judith S. | Hooning, Maartje J. | Hollestelle, Antoinette | Van Den Ouweland, Ans M.W. | Jager, Agnes | Li, Jingmei | Liu, Jianjun | Humphreys, Keith | Shu, Xiao-Ou | Lu, Wei | Gao, Yu-Tang | Cai, Hui | Cross, Simon S. | Reed, Malcolm W. R. | Blot, William | Signorello, Lisa B. | Cai, Qiuyin | Pharoah, Paul D.P. | Perkins, Barbara | Shah, Mitul | Blows, Fiona M. | Kang, Daehee | Yoo, Keun-Young | Noh, Dong-Young | Hartman, Mikael | Miao, Hui | Chia, Kee Seng | Putti, Thomas Choudary | Hamann, Ute | Luccarini, Craig | Baynes, Caroline | Ahmed, Shahana | Maranian, Mel | Healey, Catherine S. | Jakubowska, Anna | Lubinski, Jan | Jaworska-Bieniek, Katarzyna | Durda, Katarzyna | Sangrajrang, Suleeporn | Gaborieau, Valerie | Brennan, Paul | Mckay, James | Slager, Susan | Toland, Amanda E. | Yannoukakos, Drakoulis | Shen, Chen-Yang | Hsiung, Chia-Ni | Wu, Pei-Ei | Ding, Shian-ling | Ashworth, Alan | Jones, Michael | Orr, Nick | Swerdlow, Anthony J | Tsimiklis, Helen | Makalic, Enes | Schmidt, Daniel F. | Bui, Quang M. | Chanock, Stephen J. | Hunter, David J. | Hein, Rebecca | Dahmen, Norbert | Beckmann, Lars | Aaltonen, Kirsimari | Muranen, Taru A. | Heikkinen, Tuomas | Irwanto, Astrid | Rahman, Nazneen | Turnbull, Clare A. | Waisfisz, Quinten | Meijers-Heijboer, Hanne E. J. | Adank, Muriel A. | Van Der Luijt, Rob B. | Hall, Per | Chenevix-Trench, Georgia | Dunning, Alison | Easton, Douglas F. | Cox, Angela
Human Molecular Genetics  2014;24(1):285-298.
Previous studies have suggested that polymorphisms in CASP8 on chromosome 2 are associated with breast cancer risk. To clarify the role of CASP8 in breast cancer susceptibility, we carried out dense genotyping of this region in the Breast Cancer Association Consortium (BCAC). Single-nucleotide polymorphisms (SNPs) spanning a 1 Mb region around CASP8 were genotyped in 46 450 breast cancer cases and 42 600 controls of European origin from 41 studies participating in the BCAC as part of a custom genotyping array experiment (iCOGS). Missing genotypes and SNPs were imputed and, after quality exclusions, 501 typed and 1232 imputed SNPs were included in logistic regression models adjusting for study and ancestry principal components. The SNPs retained in the final model were investigated further in data from nine genome-wide association studies (GWAS) comprising in total 10 052 case and 12 575 control subjects. The most significant association signal observed in European subjects was for the imputed intronic SNP rs1830298 in ALS2CR12 (telomeric to CASP8), with per allele odds ratio and 95% confidence interval [OR (95% confidence interval, CI)] for the minor allele of 1.05 (1.03–1.07), P = 1 × 10−5. Three additional independent signals from intronic SNPs were identified, in CASP8 (rs36043647), ALS2CR11 (rs59278883) and CFLAR (rs7558475). The association with rs1830298 was replicated in the imputed results from the combined GWAS (P = 3 × 10−6), yielding a combined OR (95% CI) of 1.06 (1.04–1.08), P = 1 × 10−9. Analyses of gene expression associations in peripheral blood and normal breast tissue indicate that CASP8 might be the target gene, suggesting a mechanism involving apoptosis.
doi:10.1093/hmg/ddu431
PMCID: PMC4334820  PMID: 25168388
7.  Novel Associations between Common Breast Cancer Susceptibility Variants and Risk-Predicting Mammographic Density Measures 
Cancer research  2015;75(12):2457-2467.
Mammographic density measures adjusted for age and body mass index (BMI) are heritable predictors of breast cancer risk but few mammographic density-associated genetic variants have been identified. Using data for 10,727 women from two international consortia, we estimated associations between 77 common breast cancer susceptibility variants and absolute dense area, percent dense area and absolute non-dense area adjusted for study, age and BMI using mixed linear modeling. We found strong support for established associations between rs10995190 (in the region of ZNF365), rs2046210 (ESR1) and rs3817198 (LSP1) and adjusted absolute and percent dense areas (all p <10−5). Of 41 recently discovered breast cancer susceptibility variants, associations were found between rs1432679 (EBF1), rs17817449 (MIR1972-2: FTO), rs12710696 (2p24.1), and rs3757318 (ESR1) and adjusted absolute and percent dense areas, respectively. There were associations between rs6001930 (MKL1) and both adjusted absolute dense and non-dense areas, and between rs17356907 (NTN4) and adjusted absolute non-dense area. Trends in all but two associations were consistent with those for breast cancer risk. Results suggested that 18% of breast cancer susceptibility variants were associated with at least one mammographic density measure. Genetic variants at multiple loci were associated with both breast cancer risk and the mammographic density measures. Further understanding of the underlying mechanisms at these loci could help identify etiological pathways implicated in how mammographic density predicts breast cancer risk.
doi:10.1158/0008-5472.CAN-14-2012
PMCID: PMC4470785  PMID: 25862352
mammographic density; genetic variation; single nucleotide polymorphisms (SNPs); breast cancer; risk factors
8.  Genetic variation in mitotic regulatory pathway genes is associated with breast tumor grade 
Purrington, Kristen S. | Slettedahl, Seth | Bolla, Manjeet K. | Michailidou, Kyriaki | Czene, Kamila | Nevanlinna, Heli | Bojesen, Stig E. | Andrulis, Irene L. | Cox, Angela | Hall, Per | Carpenter, Jane | Yannoukakos, Drakoulis | Haiman, Christopher A. | Fasching, Peter A. | Mannermaa, Arto | Winqvist, Robert | Brenner, Hermann | Lindblom, Annika | Chenevix-Trench, Georgia | Benitez, Javier | Swerdlow, Anthony | Kristensen, Vessela | Guénel, Pascal | Meindl, Alfons | Darabi, Hatef | Eriksson, Mikael | Fagerholm, Rainer | Aittomäki, Kristiina | Blomqvist, Carl | Nordestgaard, Børge G. | Nielsen, Sune F. | Flyger, Henrik | Wang, Xianshu | Olswold, Curtis | Olson, Janet E. | Mulligan, Anna Marie | Knight, Julia A. | Tchatchou, Sandrine | Reed, Malcolm W.R. | Cross, Simon S. | Liu, Jianjun | Li, Jingmei | Humphreys, Keith | Clarke, Christine | Scott, Rodney | Fostira, Florentia | Fountzilas, George | Konstantopoulou, Irene | Henderson, Brian E. | Schumacher, Fredrick | Le Marchand, Loic | Ekici, Arif B. | Hartmann, Arndt | Beckmann, Matthias W. | Hartikainen, Jaana M. | Kosma, Veli-Matti | Kataja, Vesa | Jukkola-Vuorinen, Arja | Pylkäs, Katri | Kauppila, Saila | Dieffenbach, Aida Karina | Stegmaier, Christa | Arndt, Volker | Margolin, Sara | Balleine, Rosemary | Arias Perez, Jose Ignacio | Pilar Zamora, M. | Menéndez, Primitiva | Ashworth, Alan | Jones, Michael | Orr, Nick | Arveux, Patrick | Kerbrat, Pierre | Truong, Thérèse | Bugert, Peter | Toland, Amanda E. | Ambrosone, Christine B. | Labrèche, France | Goldberg, Mark S. | Dumont, Martine | Ziogas, Argyrios | Lee, Eunjung | Dite, Gillian S. | Apicella, Carmel | Southey, Melissa C. | Long, Jirong | Shrubsole, Martha | Deming-Halverson, Sandra | Ficarazzi, Filomena | Barile, Monica | Peterlongo, Paolo | Durda, Katarzyna | Jaworska-Bieniek, Katarzyna | Tollenaar, Robert A.E.M. | Seynaeve, Caroline | Brüning, Thomas | Ko, Yon-Dschun | Van Deurzen, Carolien H.M. | Martens, John W.M. | Kriege, Mieke | Figueroa, Jonine D. | Chanock, Stephen J. | Lissowska, Jolanta | Tomlinson, Ian | Kerin, Michael J. | Miller, Nicola | Schneeweiss, Andreas | Tapper, William J. | Gerty, Susan M. | Durcan, Lorraine | Mclean, Catriona | Milne, Roger L. | Baglietto, Laura | dos Santos Silva, Isabel | Fletcher, Olivia | Johnson, Nichola | Van'T Veer, Laura J. | Cornelissen, Sten | Försti, Asta | Torres, Diana | Rüdiger, Thomas | Rudolph, Anja | Flesch-Janys, Dieter | Nickels, Stefan | Weltens, Caroline | Floris, Giuseppe | Moisse, Matthieu | Dennis, Joe | Wang, Qin | Dunning, Alison M. | Shah, Mitul | Brown, Judith | Simard, Jacques | Anton-Culver, Hoda | Neuhausen, Susan L. | Hopper, John L. | Bogdanova, Natalia | Dörk, Thilo | Zheng, Wei | Radice, Paolo | Jakubowska, Anna | Lubinski, Jan | Devillee, Peter | Brauch, Hiltrud | Hooning, Maartje | García-Closas, Montserrat | Sawyer, Elinor | Burwinkel, Barbara | Marmee, Frederick | Eccles, Diana M. | Giles, Graham G. | Peto, Julian | Schmidt, Marjanka | Broeks, Annegien | Hamann, Ute | Chang-Claude, Jenny | Lambrechts, Diether | Pharoah, Paul D.P. | Easton, Douglas | Pankratz, V. Shane | Slager, Susan | Vachon, Celine M. | Couch, Fergus J.
Human Molecular Genetics  2014;23(22):6034-6046.
Mitotic index is an important component of histologic grade and has an etiologic role in breast tumorigenesis. Several small candidate gene studies have reported associations between variation in mitotic genes and breast cancer risk. We measured associations between 2156 single nucleotide polymorphisms (SNPs) from 194 mitotic genes and breast cancer risk, overall and by histologic grade, in the Breast Cancer Association Consortium (BCAC) iCOGS study (n = 39 067 cases; n = 42 106 controls). SNPs in TACC2 [rs17550038: odds ratio (OR) = 1.24, 95% confidence interval (CI) 1.16–1.33, P = 4.2 × 10−10) and EIF3H (rs799890: OR = 1.07, 95% CI 1.04–1.11, P = 8.7 × 10−6) were significantly associated with risk of low-grade breast cancer. The TACC2 signal was retained (rs17550038: OR = 1.15, 95% CI 1.07–1.23, P = 7.9 × 10−5) after adjustment for breast cancer risk SNPs in the nearby FGFR2 gene, suggesting that TACC2 is a novel, independent genome-wide significant genetic risk locus for low-grade breast cancer. While no SNPs were individually associated with high-grade disease, a pathway-level gene set analysis showed that variation across the 194 mitotic genes was associated with high-grade breast cancer risk (P = 2.1 × 10−3). These observations will provide insight into the contribution of mitotic defects to histological grade and the etiology of breast cancer.
doi:10.1093/hmg/ddu300
PMCID: PMC4204763  PMID: 24927736
9.  Genome-wide association analysis of more than 120,000 individuals identifies 15 new susceptibility loci for breast cancer 
Michailidou, Kyriaki | Beesley, Jonathan | Lindstrom, Sara | Canisius, Sander | Dennis, Joe | Lush, Michael | Maranian, Mel J | Bolla, Manjeet K | Wang, Qin | Shah, Mitul | Perkins, Barbara J | Czene, Kamila | Eriksson, Mikael | Darabi, Hatef | Brand, Judith S | Bojesen, Stig E | Nordestgaard, Børge G | Flyger, Henrik | Nielsen, Sune F | Rahman, Nazneen | Turnbull, Clare | Fletcher, Olivia | Peto, Julian | Gibson, Lorna | dos-Santos-Silva, Isabel | Chang-Claude, Jenny | Flesch-Janys, Dieter | Rudolph, Anja | Eilber, Ursula | Behrens, Sabine | Nevanlinna, Heli | Muranen, Taru A | Aittomäki, Kristiina | Blomqvist, Carl | Khan, Sofia | Aaltonen, Kirsimari | Ahsan, Habibul | Kibriya, Muhammad G | Whittemore, Alice S | John, Esther M | Malone, Kathleen E | Gammon, Marilie D | Santella, Regina M | Ursin, Giske | Makalic, Enes | Schmidt, Daniel F | Casey, Graham | Hunter, David J | Gapstur, Susan M | Gaudet, Mia M | Diver, W Ryan | Haiman, Christopher A | Schumacher, Fredrick | Henderson, Brian E | Le Marchand, Loic | Berg, Christine D | Chanock, Stephen | Figueroa, Jonine | Hoover, Robert N | Lambrechts, Diether | Neven, Patrick | Wildiers, Hans | van Limbergen, Erik | Schmidt, Marjanka K | Broeks, Annegien | Verhoef, Senno | Cornelissen, Sten | Couch, Fergus J | Olson, Janet E | Hallberg, Emily | Vachon, Celine | Waisfisz, Quinten | Meijers-Heijboer, Hanne | Adank, Muriel A | van der Luijt, Rob B | Li, Jingmei | Liu, Jianjun | Humphreys, Keith | Kang, Daehee | Choi, Ji-Yeob | Park, Sue K | Yoo, Keun-Young | Matsuo, Keitaro | Ito, Hidemi | Iwata, Hiroji | Tajima, Kazuo | Guénel, Pascal | Truong, Thérèse | Mulot, Claire | Sanchez, Marie | Burwinkel, Barbara | Marme, Frederik | Surowy, Harald | Sohn, Christof | Wu, Anna H | Tseng, Chiu-chen | Van Den Berg, David | Stram, Daniel O | González-Neira, Anna | Benitez, Javier | Zamora, M Pilar | Perez, Jose Ignacio Arias | Shu, Xiao-Ou | Lu, Wei | Gao, Yu-Tang | Cai, Hui | Cox, Angela | Cross, Simon S | Reed, Malcolm WR | Andrulis, Irene L | Knight, Julia A | Glendon, Gord | Mulligan, Anna Marie | Sawyer, Elinor J | Tomlinson, Ian | Kerin, Michael J | Miller, Nicola | Lindblom, Annika | Margolin, Sara | Teo, Soo Hwang | Yip, Cheng Har | Taib, Nur Aishah Mohd | TAN, Gie-Hooi | Hooning, Maartje J | Hollestelle, Antoinette | Martens, John WM | Collée, J Margriet | Blot, William | Signorello, Lisa B | Cai, Qiuyin | Hopper, John L | Southey, Melissa C | Tsimiklis, Helen | Apicella, Carmel | Shen, Chen-Yang | Hsiung, Chia-Ni | Wu, Pei-Ei | Hou, Ming-Feng | Kristensen, Vessela N | Nord, Silje | Alnaes, Grethe I Grenaker | Giles, Graham G | Milne, Roger L | McLean, Catriona | Canzian, Federico | Trichopoulos, Dmitrios | Peeters, Petra | Lund, Eiliv | Sund, Malin | Khaw, Kay-Tee | Gunter, Marc J | Palli, Domenico | Mortensen, Lotte Maxild | Dossus, Laure | Huerta, Jose-Maria | Meindl, Alfons | Schmutzler, Rita K | Sutter, Christian | Yang, Rongxi | Muir, Kenneth | Lophatananon, Artitaya | Stewart-Brown, Sarah | Siriwanarangsan, Pornthep | Hartman, Mikael | Miao, Hui | Chia, Kee Seng | Chan, Ching Wan | Fasching, Peter A | Hein, Alexander | Beckmann, Matthias W | Haeberle, Lothar | Brenner, Hermann | Dieffenbach, Aida Karina | Arndt, Volker | Stegmaier, Christa | Ashworth, Alan | Orr, Nick | Schoemaker, Minouk J | Swerdlow, Anthony J | Brinton, Louise | Garcia-Closas, Montserrat | Zheng, Wei | Halverson, Sandra L | Shrubsole, Martha | Long, Jirong | Goldberg, Mark S | Labrèche, France | Dumont, Martine | Winqvist, Robert | Pylkäs, Katri | Jukkola-Vuorinen, Arja | Grip, Mervi | Brauch, Hiltrud | Hamann, Ute | Brüning, Thomas | Radice, Paolo | Peterlongo, Paolo | Manoukian, Siranoush | Bernard, Loris | Bogdanova, Natalia V | Dörk, Thilo | Mannermaa, Arto | Kataja, Vesa | Kosma, Veli-Matti | Hartikainen, Jaana M | Devilee, Peter | Tollenaar, Robert AEM | Seynaeve, Caroline | Van Asperen, Christi J | Jakubowska, Anna | Lubinski, Jan | Jaworska, Katarzyna | Huzarski, Tomasz | Sangrajrang, Suleeporn | Gaborieau, Valerie | Brennan, Paul | McKay, James | Slager, Susan | Toland, Amanda E | Ambrosone, Christine B | Yannoukakos, Drakoulis | Kabisch, Maria | Torres, Diana | Neuhausen, Susan L | Anton-Culver, Hoda | Luccarini, Craig | Baynes, Caroline | Ahmed, Shahana | Healey, Catherine S | Tessier, Daniel C | Vincent, Daniel | Bacot, Francois | Pita, Guillermo | Alonso, M Rosario | Álvarez, Nuria | Herrero, Daniel | Simard, Jacques | Pharoah, Paul PDP | Kraft, Peter | Dunning, Alison M | Chenevix-Trench, Georgia | Hall, Per | Easton, Douglas F
Nature genetics  2015;47(4):373-380.
Genome wide association studies (GWAS) and large scale replication studies have identified common variants in 79 loci associated with breast cancer, explaining ~14% of the familial risk of the disease. To identify new susceptibility loci, we performed a meta-analysis of 11 GWAS comprising of 15,748 breast cancer cases and 18,084 controls, and 46,785 cases and 42,892 controls from 41 studies genotyped on a 200K custom array (iCOGS). Analyses were restricted to women of European ancestry. Genotypes for more than 11M SNPs were generated by imputation using the 1000 Genomes Project reference panel. We identified 15 novel loci associated with breast cancer at P<5×10−8. Combining association analysis with ChIP-Seq data in mammary cell lines and ChIA-PET chromatin interaction data in ENCODE, we identified likely target genes in two regions: SETBP1 on 18q12.3 and RNF115 and PDZK1 on 1q21.1. One association appears to be driven by an amino-acid substitution in EXO1.
doi:10.1038/ng.3242
PMCID: PMC4549775  PMID: 25751625
10.  A comprehensive evaluation of interaction between genetic variants and use of menopausal hormone therapy on mammographic density 
Introduction
Mammographic density is an established breast cancer risk factor with a strong genetic component and can be increased in women using menopausal hormone therapy (MHT). Here, we aimed to identify genetic variants that may modify the association between MHT use and mammographic density.
Methods
The study comprised 6,298 postmenopausal women from the Mayo Mammography Health Study and nine studies included in the Breast Cancer Association Consortium. We selected for evaluation 1327 single nucleotide polymorphisms (SNPs) showing the lowest P-values for interaction (Pint) in a meta-analysis of genome-wide gene-environment interaction studies with MHT use on risk of breast cancer, 2541 SNPs in candidate genes (AKR1C4, CYP1A1-CYP1A2, CYP1B1, ESR2, PPARG, PRL, SULT1A1-SULT1A2 and TNF) and ten SNPs (AREG-rs10034692, PRDM6-rs186749, ESR1-rs12665607, ZNF365-rs10995190, 8p11.23-rs7816345, LSP1-rs3817198, IGF1-rs703556, 12q24-rs1265507, TMEM184B-rs7289126, and SGSM3-rs17001868) associated with mammographic density in genome-wide studies. We used multiple linear regression models adjusted for potential confounders to evaluate interactions between SNPs and current use of MHT on mammographic density.
Results
No significant interactions were identified after adjustment for multiple testing. The strongest SNP-MHT interaction (unadjusted Pint <0.0004) was observed with rs9358531 6.5kb 5′ of PRL. Furthermore, three SNPs in PLCG2 that had previously been shown to modify the association of MHT use with breast cancer risk were found to modify also the association of MHT use with mammographic density (unadjusted Pint <0.002), but solely among cases (unadjusted Pint SNP×MHT×case-status <0.02).
Conclusions
The study identified potential interactions on mammographic density between current use of MHT and SNPs near PRL and in PLCG2, which require confirmation. Given the moderate size of the interactions observed, larger studies are needed to identify genetic modifiers of the association of MHT use with mammographic density.
Electronic supplementary material
The online version of this article (doi:10.1186/s13058-015-0625-9) contains supplementary material, which is available to authorized users.
doi:10.1186/s13058-015-0625-9
PMCID: PMC4537547  PMID: 26275715
12.  Common germline polymorphisms associated with breast cancer-specific survival 
Pirie, Ailith | Guo, Qi | Kraft, Peter | Canisius, Sander | Eccles, Diana M | Rahman, Nazneen | Nevanlinna, Heli | Chen, Constance | Khan, Sofia | Tyrer, Jonathan | Bolla, Manjeet K | Wang, Qin | Dennis, Joe | Michailidou, Kyriaki | Lush, Michael | Dunning, Alison M | Shah, Mitul | Czene, Kamila | Darabi, Hatef | Eriksson, Mikael | Lambrechts, Dieter | Weltens, Caroline | Leunen, Karin | van Ongeval, Chantal | Nordestgaard, Børge G | Nielsen, Sune F | Flyger, Henrik | Rudolph, Anja | Seibold, Petra | Flesch-Janys, Dieter | Blomqvist, Carl | Aittomäki, Kristiina | Fagerholm, Rainer | Muranen, Taru A | Olsen, Janet E | Hallberg, Emily | Vachon, Celine | Knight, Julia A | Glendon, Gord | Mulligan, Anna Marie | Broeks, Annegien | Cornelissen, Sten | Haiman, Christopher A | Henderson, Brian E | Schumacher, Frederick | Le Marchand, Loic | Hopper, John L | Tsimiklis, Helen | Apicella, Carmel | Southey, Melissa C | Cross, Simon S | Reed, Malcolm WR | Giles, Graham G | Milne, Roger L | McLean, Catriona | Winqvist, Robert | Pylkäs, Katri | Jukkola-Vuorinen, Arja | Grip, Mervi | Hooning, Maartje J | Hollestelle, Antoinette | Martens, John WM | van den Ouweland, Ans MW | Marme, Federick | Schneeweiss, Andreas | Yang, Rongxi | Burwinkel, Barbara | Figueroa, Jonine | Chanock, Stephen J | Lissowska, Jolanta | Sawyer, Elinor J | Tomlinson, Ian | Kerin, Michael J | Miller, Nicola | Brenner, Hermann | Butterbach, Katja | Holleczek, Bernd | Kataja, Vesa | Kosma, Veli-Matti | Hartikainen, Jaana M | Li, Jingmei | Brand, Judith S | Humphreys, Keith | Devilee, Peter | Tollenaar, Robert AEM | Seynaeve, Caroline | Radice, Paolo | Peterlongo, Paolo | Manoukian, Siranoush | Ficarazzi, Filomena | Beckmann, Matthias W | Hein, Alexander | Ekici, Arif B | Balleine, Rosemary | Phillips, Kelly-Anne | Benitez, Javier | Zamora, M Pilar | Perez, Jose Ignacio Arias | Menéndez, Primitiva | Jakubowska, Anna | Lubinski, Jan | Gronwald, Jacek | Durda, Katarzyna | Hamann, Ute | Kabisch, Maria | Ulmer, Hans Ulrich | Rüdiger, Thomas | Margolin, Sara | Kristensen, Vessela | Nord, Siljie | Evans, D Gareth | Abraham, Jean | Earl, Helena | Poole, Christopher J | Hiller, Louise | Dunn, Janet A | Bowden, Sarah | Yang, Rose | Campa, Daniele | Diver, W Ryan | Gapstur, Susan M | Gaudet, Mia M | Hankinson, Susan | Hoover, Robert N | Hüsing, Anika | Kaaks, Rudolf | Machiela, Mitchell J | Willett, Walter | Barrdahl, Myrto | Canzian, Federico | Chin, Suet-Feung | Caldas, Carlos | Hunter, David J | Lindstrom, Sara | Garcia-Closas, Montserrat | Couch, Fergus J | Chenevix-Trench, Georgia | Mannermaa, Arto | Andrulis, Irene L | Hall, Per | Chang-Claude, Jenny | Easton, Douglas F | Bojesen, Stig E | Cox, Angela | Fasching, Peter A | Pharoah, Paul DP | Schmidt, Marjanka K
Introduction
Previous studies have identified common germline variants nominally associated with breast cancer survival. These associations have not been widely replicated in further studies. The purpose of this study was to evaluate the association of previously reported SNPs with breast cancer-specific survival using data from a pooled analysis of eight breast cancer survival genome-wide association studies (GWAS) from the Breast Cancer Association Consortium.
Methods
A literature review was conducted of all previously published associations between common germline variants and three survival outcomes: breast cancer-specific survival, overall survival and disease-free survival. All associations that reached the nominal significance level of P value <0.05 were included. Single nucleotide polymorphisms that had been previously reported as nominally associated with at least one survival outcome were evaluated in the pooled analysis of over 37,000 breast cancer cases for association with breast cancer-specific survival. Previous associations were evaluated using a one-sided test based on the reported direction of effect.
Results
Fifty-six variants from 45 previous publications were evaluated in the meta-analysis. Fifty-four of these were evaluated in the full set of 37,954 breast cancer cases with 2,900 events and the two additional variants were evaluated in a reduced sample size of 30,000 samples in order to ensure independence from the previously published studies. Five variants reached nominal significance (P <0.05) in the pooled GWAS data compared to 2.8 expected under the null hypothesis. Seven additional variants were associated (P <0.05) with ER-positive disease.
Conclusions
Although no variants reached genome-wide significance (P <5 x 10−8), these results suggest that there is some evidence of association between candidate common germline variants and breast cancer prognosis. Larger studies from multinational collaborations are necessary to increase the power to detect associations, between common variants and prognosis, at more stringent significance levels.
Electronic supplementary material
The online version of this article (doi:10.1186/s13058-015-0570-7) contains supplementary material, which is available to authorized users.
doi:10.1186/s13058-015-0570-7
PMCID: PMC4484708  PMID: 25897948
13.  Identification of Novel Genetic Markers of Breast Cancer Survival 
Guo, Qi | Schmidt, Marjanka K. | Kraft, Peter | Canisius, Sander | Chen, Constance | Khan, Sofia | Tyrer, Jonathan | Bolla, Manjeet K. | Wang, Qin | Dennis, Joe | Michailidou, Kyriaki | Lush, Michael | Kar, Siddhartha | Beesley, Jonathan | Dunning, Alison M. | Shah, Mitul | Czene, Kamila | Darabi, Hatef | Eriksson, Mikael | Lambrechts, Diether | Weltens, Caroline | Leunen, Karin | Bojesen, Stig E. | Nordestgaard, Børge G. | Nielsen, Sune F. | Flyger, Henrik | Chang-Claude, Jenny | Rudolph, Anja | Seibold, Petra | Flesch-Janys, Dieter | Blomqvist, Carl | Aittomäki, Kristiina | Fagerholm, Rainer | Muranen, Taru A. | Couch, Fergus J. | Olson, Janet E. | Vachon, Celine | Andrulis, Irene L. | Knight, Julia A. | Glendon, Gord | Mulligan, Anna Marie | Broeks, Annegien | Hogervorst, Frans B. | Haiman, Christopher A. | Henderson, Brian E. | Schumacher, Fredrick | Le Marchand, Loic | Hopper, John L. | Tsimiklis, Helen | Apicella, Carmel | Southey, Melissa C. | Cox, Angela | Cross, Simon S. | Reed, Malcolm W. R. | Giles, Graham G. | Milne, Roger L. | McLean, Catriona | Winqvist, Robert | Pylkäs, Katri | Jukkola-Vuorinen, Arja | Grip, Mervi | Hooning, Maartje J. | Hollestelle, Antoinette | Martens, John W. M. | van den Ouweland, Ans M. W. | Marme, Federik | Schneeweiss, Andreas | Yang, Rongxi | Burwinkel, Barbara | Figueroa, Jonine | Chanock, Stephen J. | Lissowska, Jolanta | Sawyer, Elinor J. | Tomlinson, Ian | Kerin, Michael J. | Miller, Nicola | Brenner, Hermann | Dieffenbach, Aida Karina | Arndt, Volker | Holleczek, Bernd | Mannermaa, Arto | Kataja, Vesa | Kosma, Veli-Matti | Hartikainen, Jaana M. | Li, Jingmei | Brand, Judith S. | Humphreys, Keith | Devilee, Peter | Tollenaar, Rob A. E. M. | Seynaeve, Caroline | Radice, Paolo | Peterlongo, Paolo | Bonanni, Bernardo | Mariani, Paolo | Fasching, Peter A. | Beckmann, Matthias W. | Hein, Alexander | Ekici, Arif B. | Chenevix-Trench, Georgia | Balleine, Rosemary | Phillips, Kelly-Anne | Benitez, Javier | Zamora, M. Pilar | Arias Perez, Jose Ignacio | Menéndez, Primitiva | Jakubowska, Anna | Lubinski, Jan | Jaworska-Bieniek, Katarzyna | Durda, Katarzyna | Hamann, Ute | Kabisch, Maria | Ulmer, Hans Ulrich | Rüdiger, Thomas | Margolin, Sara | Kristensen, Vessela | Nord, Silje | Evans, D. Gareth | Abraham, Jean E. | Earl, Helena M. | Hiller, Louise | Dunn, Janet A. | Bowden, Sarah | Berg, Christine | Campa, Daniele | Diver, W. Ryan | Gapstur, Susan M. | Gaudet, Mia M. | Hankinson, Susan E. | Hoover, Robert N. | Hüsing, Anika | Kaaks, Rudolf | Machiela, Mitchell J. | Willett, Walter | Barrdahl, Myrto | Canzian, Federico | Chin, Suet-Feung | Caldas, Carlos | Hunter, David J. | Lindstrom, Sara | García-Closas, Montserrat | Hall, Per | Easton, Douglas F. | Eccles, Diana M. | Rahman, Nazneen | Nevanlinna, Heli | Pharoah, Paul D. P.
Background:
Survival after a diagnosis of breast cancer varies considerably between patients, and some of this variation may be because of germline genetic variation. We aimed to identify genetic markers associated with breast cancer–specific survival.
Methods:
We conducted a large meta-analysis of studies in populations of European ancestry, including 37954 patients with 2900 deaths from breast cancer. Each study had been genotyped for between 200000 and 900000 single nucleotide polymorphisms (SNPs) across the genome; genotypes for nine million common variants were imputed using a common reference panel from the 1000 Genomes Project. We also carried out subtype-specific analyses based on 6881 estrogen receptor (ER)–negative patients (920 events) and 23059 ER-positive patients (1333 events). All statistical tests were two-sided.
Results:
We identified one new locus (rs2059614 at 11q24.2) associated with survival in ER-negative breast cancer cases (hazard ratio [HR] = 1.95, 95% confidence interval [CI] = 1.55 to 2.47, P = 1.91 x 10–8). Genotyping a subset of 2113 case patients, of which 300 were ER negative, provided supporting evidence for the quality of the imputation. The association in this set of case patients was stronger for the observed genotypes than for the imputed genotypes. A second locus (rs148760487 at 2q24.2) was associated at genome-wide statistical significance in initial analyses; the association was similar in ER-positive and ER-negative case patients. Here the results of genotyping suggested that the finding was less robust.
Conclusions:
This is currently the largest study investigating genetic variation associated with breast cancer survival. Our results have potential clinical implications, as they confirm that germline genotype can provide prognostic information in addition to standard tumor prognostic factors.
doi:10.1093/jnci/djv081
PMCID: PMC4555642  PMID: 25890600
14.  Prediction of Breast Cancer Risk Based on Profiling With Common Genetic Variants 
Mavaddat, Nasim | Pharoah, Paul D. P. | Michailidou, Kyriaki | Tyrer, Jonathan | Brook, Mark N. | Bolla, Manjeet K. | Wang, Qin | Dennis, Joe | Dunning, Alison M. | Shah, Mitul | Luben, Robert | Brown, Judith | Bojesen, Stig E. | Nordestgaard, Børge G. | Nielsen, Sune F. | Flyger, Henrik | Czene, Kamila | Darabi, Hatef | Eriksson, Mikael | Peto, Julian | dos-Santos-Silva, Isabel | Dudbridge, Frank | Johnson, Nichola | Schmidt, Marjanka K. | Broeks, Annegien | Verhoef, Senno | Rutgers, Emiel J. | Swerdlow, Anthony | Ashworth, Alan | Orr, Nick | Schoemaker, Minouk J. | Figueroa, Jonine | Chanock, Stephen J. | Brinton, Louise | Lissowska, Jolanta | Couch, Fergus J. | Olson, Janet E. | Vachon, Celine | Pankratz, Vernon S. | Lambrechts, Diether | Wildiers, Hans | Van Ongeval, Chantal | van Limbergen, Erik | Kristensen, Vessela | Grenaker Alnæs, Grethe | Nord, Silje | Borresen-Dale, Anne-Lise | Nevanlinna, Heli | Muranen, Taru A. | Aittomäki, Kristiina | Blomqvist, Carl | Chang-Claude, Jenny | Rudolph, Anja | Seibold, Petra | Flesch-Janys, Dieter | Fasching, Peter A. | Haeberle, Lothar | Ekici, Arif B. | Beckmann, Matthias W. | Burwinkel, Barbara | Marme, Frederik | Schneeweiss, Andreas | Sohn, Christof | Trentham-Dietz, Amy | Newcomb, Polly | Titus, Linda | Egan, Kathleen M. | Hunter, David J. | Lindstrom, Sara | Tamimi, Rulla M. | Kraft, Peter | Rahman, Nazneen | Turnbull, Clare | Renwick, Anthony | Seal, Sheila | Li, Jingmei | Liu, Jianjun | Humphreys, Keith | Benitez, Javier | Pilar Zamora, M. | Arias Perez, Jose Ignacio | Menéndez, Primitiva | Jakubowska, Anna | Lubinski, Jan | Jaworska-Bieniek, Katarzyna | Durda, Katarzyna | Bogdanova, Natalia V. | Antonenkova, Natalia N. | Dörk, Thilo | Anton-Culver, Hoda | Neuhausen, Susan L. | Ziogas, Argyrios | Bernstein, Leslie | Devilee, Peter | Tollenaar, Robert A. E. M. | Seynaeve, Caroline | van Asperen, Christi J. | Cox, Angela | Cross, Simon S. | Reed, Malcolm W. R. | Khusnutdinova, Elza | Bermisheva, Marina | Prokofyeva, Darya | Takhirova, Zalina | Meindl, Alfons | Schmutzler, Rita K. | Sutter, Christian | Yang, Rongxi | Schürmann, Peter | Bremer, Michael | Christiansen, Hans | Park-Simon, Tjoung-Won | Hillemanns, Peter | Guénel, Pascal | Truong, Thérèse | Menegaux, Florence | Sanchez, Marie | Radice, Paolo | Peterlongo, Paolo | Manoukian, Siranoush | Pensotti, Valeria | Hopper, John L. | Tsimiklis, Helen | Apicella, Carmel | Southey, Melissa C. | Brauch, Hiltrud | Brüning, Thomas | Ko, Yon-Dschun | Sigurdson, Alice J. | Doody, Michele M. | Hamann, Ute | Torres, Diana | Ulmer, Hans-Ulrich | Försti, Asta | Sawyer, Elinor J. | Tomlinson, Ian | Kerin, Michael J. | Miller, Nicola | Andrulis, Irene L. | Knight, Julia A. | Glendon, Gord | Marie Mulligan, Anna | Chenevix-Trench, Georgia | Balleine, Rosemary | Giles, Graham G. | Milne, Roger L. | McLean, Catriona | Lindblom, Annika | Margolin, Sara | Haiman, Christopher A. | Henderson, Brian E. | Schumacher, Fredrick | Le Marchand, Loic | Eilber, Ursula | Wang-Gohrke, Shan | Hooning, Maartje J. | Hollestelle, Antoinette | van den Ouweland, Ans M. W. | Koppert, Linetta B. | Carpenter, Jane | Clarke, Christine | Scott, Rodney | Mannermaa, Arto | Kataja, Vesa | Kosma, Veli-Matti | Hartikainen, Jaana M. | Brenner, Hermann | Arndt, Volker | Stegmaier, Christa | Karina Dieffenbach, Aida | Winqvist, Robert | Pylkäs, Katri | Jukkola-Vuorinen, Arja | Grip, Mervi | Offit, Kenneth | Vijai, Joseph | Robson, Mark | Rau-Murthy, Rohini | Dwek, Miriam | Swann, Ruth | Annie Perkins, Katherine | Goldberg, Mark S. | Labrèche, France | Dumont, Martine | Eccles, Diana M. | Tapper, William J. | Rafiq, Sajjad | John, Esther M. | Whittemore, Alice S. | Slager, Susan | Yannoukakos, Drakoulis | Toland, Amanda E. | Yao, Song | Zheng, Wei | Halverson, Sandra L. | González-Neira, Anna | Pita, Guillermo | Rosario Alonso, M. | Álvarez, Nuria | Herrero, Daniel | Tessier, Daniel C. | Vincent, Daniel | Bacot, Francois | Luccarini, Craig | Baynes, Caroline | Ahmed, Shahana | Maranian, Mel | Healey, Catherine S. | Simard, Jacques | Hall, Per | Easton, Douglas F. | Garcia-Closas, Montserrat
Background:
Data for multiple common susceptibility alleles for breast cancer may be combined to identify women at different levels of breast cancer risk. Such stratification could guide preventive and screening strategies. However, empirical evidence for genetic risk stratification is lacking.
Methods:
We investigated the value of using 77 breast cancer-associated single nucleotide polymorphisms (SNPs) for risk stratification, in a study of 33 673 breast cancer cases and 33 381 control women of European origin. We tested all possible pair-wise multiplicative interactions and constructed a 77-SNP polygenic risk score (PRS) for breast cancer overall and by estrogen receptor (ER) status. Absolute risks of breast cancer by PRS were derived from relative risk estimates and UK incidence and mortality rates.
Results:
There was no strong evidence for departure from a multiplicative model for any SNP pair. Women in the highest 1% of the PRS had a three-fold increased risk of developing breast cancer compared with women in the middle quintile (odds ratio [OR] = 3.36, 95% confidence interval [CI] = 2.95 to 3.83). The ORs for ER-positive and ER-negative disease were 3.73 (95% CI = 3.24 to 4.30) and 2.80 (95% CI = 2.26 to 3.46), respectively. Lifetime risk of breast cancer for women in the lowest and highest quintiles of the PRS were 5.2% and 16.6% for a woman without family history, and 8.6% and 24.4% for a woman with a first-degree family history of breast cancer.
Conclusions:
The PRS stratifies breast cancer risk in women both with and without a family history of breast cancer. The observed level of risk discrimination could inform targeted screening and prevention strategies. Further discrimination may be achievable through combining the PRS with lifestyle/environmental factors, although these were not considered in this report.
doi:10.1093/jnci/djv036
PMCID: PMC4754625  PMID: 25855707
15.  A large-scale assessment of two-way SNP interactions in breast cancer susceptibility using 46 450 cases and 42 461 controls from the breast cancer association consortium 
Milne, Roger L. | Herranz, Jesús | Michailidou, Kyriaki | Dennis, Joe | Tyrer, Jonathan P. | Zamora, M. Pilar | Arias-Perez, José Ignacio | González-Neira, Anna | Pita, Guillermo | Alonso, M. Rosario | Wang, Qin | Bolla, Manjeet K. | Czene, Kamila | Eriksson, Mikael | Humphreys, Keith | Darabi, Hatef | Li, Jingmei | Anton-Culver, Hoda | Neuhausen, Susan L. | Ziogas, Argyrios | Clarke, Christina A. | Hopper, John L. | Dite, Gillian S. | Apicella, Carmel | Southey, Melissa C. | Chenevix-Trench, Georgia | Swerdlow, Anthony | Ashworth, Alan | Orr, Nicholas | Schoemaker, Minouk | Jakubowska, Anna | Lubinski, Jan | Jaworska-Bieniek, Katarzyna | Durda, Katarzyna | Andrulis, Irene L. | Knight, Julia A. | Glendon, Gord | Mulligan, Anna Marie | Bojesen, Stig E. | Nordestgaard, Børge G. | Flyger, Henrik | Nevanlinna, Heli | Muranen, Taru A. | Aittomäki, Kristiina | Blomqvist, Carl | Chang-Claude, Jenny | Rudolph, Anja | Seibold, Petra | Flesch-Janys, Dieter | Wang, Xianshu | Olson, Janet E. | Vachon, Celine | Purrington, Kristen | Winqvist, Robert | Pylkäs, Katri | Jukkola-Vuorinen, Arja | Grip, Mervi | Dunning, Alison M. | Shah, Mitul | Guénel, Pascal | Truong, Thérèse | Sanchez, Marie | Mulot, Claire | Brenner, Hermann | Dieffenbach, Aida Karina | Arndt, Volker | Stegmaier, Christa | Lindblom, Annika | Margolin, Sara | Hooning, Maartje J. | Hollestelle, Antoinette | Collée, J. Margriet | Jager, Agnes | Cox, Angela | Brock, Ian W. | Reed, Malcolm W.R. | Devilee, Peter | Tollenaar, Robert A.E.M. | Seynaeve, Caroline | Haiman, Christopher A. | Henderson, Brian E. | Schumacher, Fredrick | Le Marchand, Loic | Simard, Jacques | Dumont, Martine | Soucy, Penny | Dörk, Thilo | Bogdanova, Natalia V. | Hamann, Ute | Försti, Asta | Rüdiger, Thomas | Ulmer, Hans-Ulrich | Fasching, Peter A. | Häberle, Lothar | Ekici, Arif B. | Beckmann, Matthias W. | Fletcher, Olivia | Johnson, Nichola | dos Santos Silva, Isabel | Peto, Julian | Radice, Paolo | Peterlongo, Paolo | Peissel, Bernard | Mariani, Paolo | Giles, Graham G. | Severi, Gianluca | Baglietto, Laura | Sawyer, Elinor | Tomlinson, Ian | Kerin, Michael | Miller, Nicola | Marme, Federik | Burwinkel, Barbara | Mannermaa, Arto | Kataja, Vesa | Kosma, Veli-Matti | Hartikainen, Jaana M. | Lambrechts, Diether | Yesilyurt, Betul T. | Floris, Giuseppe | Leunen, Karin | Alnæs, Grethe Grenaker | Kristensen, Vessela | Børresen-Dale, Anne-Lise | García-Closas, Montserrat | Chanock, Stephen J. | Lissowska, Jolanta | Figueroa, Jonine D. | Schmidt, Marjanka K. | Broeks, Annegien | Verhoef, Senno | Rutgers, Emiel J. | Brauch, Hiltrud | Brüning, Thomas | Ko, Yon-Dschun | Couch, Fergus J. | Toland, Amanda E. | Yannoukakos, Drakoulis | Pharoah, Paul D.P. | Hall, Per | Benítez, Javier | Malats, Núria | Easton, Douglas F.
Human Molecular Genetics  2013;23(7):1934-1946.
Part of the substantial unexplained familial aggregation of breast cancer may be due to interactions between common variants, but few studies have had adequate statistical power to detect interactions of realistic magnitude. We aimed to assess all two-way interactions in breast cancer susceptibility between 70 917 single nucleotide polymorphisms (SNPs) selected primarily based on prior evidence of a marginal effect. Thirty-eight international studies contributed data for 46 450 breast cancer cases and 42 461 controls of European origin as part of a multi-consortium project (COGS). First, SNPs were preselected based on evidence (P < 0.01) of a per-allele main effect, and all two-way combinations of those were evaluated by a per-allele (1 d.f.) test for interaction using logistic regression. Second, all 2.5 billion possible two-SNP combinations were evaluated using Boolean operation-based screening and testing, and SNP pairs with the strongest evidence of interaction (P < 10−4) were selected for more careful assessment by logistic regression. Under the first approach, 3277 SNPs were preselected, but an evaluation of all possible two-SNP combinations (1 d.f.) identified no interactions at P < 10−8. Results from the second analytic approach were consistent with those from the first (P > 10−10). In summary, we observed little evidence of two-way SNP interactions in breast cancer susceptibility, despite the large number of SNPs with potential marginal effects considered and the very large sample size. This finding may have important implications for risk prediction, simplifying the modelling required. Further comprehensive, large-scale genome-wide interaction studies may identify novel interacting loci if the inherent logistic and computational challenges can be overcome.
doi:10.1093/hmg/ddt581
PMCID: PMC3943524  PMID: 24242184
16.  A Genome-wide Association Study of Early-onset Breast Cancer Identifies PFKM as a Novel Breast Cancer Gene and Supports a Common Genetic Spectrum for Breast Cancer at Any Age 
Ahsan, Habibul | Halpern, Jerry | Kibriya, Muhammad G | Pierce, Brandon L | Tong, Lin | Gamazon, Eric | McGuire, Valerie | Felberg, Anna | Shi, Jianxin | Jasmine, Farzana | Roy, Shantanu | Brutus, Rachelle | Argos, Maria | Melkonian, Stephanie | Chang-Claude, Jenny | Andrulis, Irene | Hopper, John L | John, Esther M. | Malone, Kathi | Ursin, Giske | Gammon, Marilie D | Thomas, Duncan C | Seminara, Daniela | Casey, Graham | Knight, Julia A | Southey, Melissa C | Giles, Graham G | Santella, Regina M | Lee, Eunjung | Conti, David | Duggan, David | Gallinger, Steve | Haile, Robert | Jenkins, Mark | Lindor, Noralane M | Newcomb, Polly | Michailidou, Kyriaki | Apicella, Carmel | Park, Daniel J | Peto, Julian | Fletcher, Olivia | Silva, Isabel dos Santos | Lathrop, Mark | Hunter, David J | Chanock, Stephen J | Meindl, Alfons | Schmutzler, Rita K | Müller-Myhsok, Bertram | Lochmann, Magdalena | Beckmann, Lars | Hein, Rebecca | Makalic, Enes | Schmidt, Daniel F | Bui, Quang Minh | Stone, Jennifer | Flesch-Janys, Dieter | Dahmen, Norbert | Nevanlinna, Heli | Aittomäki, Kristiina | Blomqvist, Carl | Hall, Per | Czene, Kamila | Irwanto, Astrid | Liu, Jianjun | Rahman, Nazneen | Turnbull, Clare | Dunning, Alison M. | Pharoah, Paul | Waisfisz, Quinten | Meijers-Heijboer, Hanne | Uitterlinden, Andre G. | Rivadeneira, Fernando | Nicolae, Dan | Easton, Douglas F | Cox, Nancy J | Whittemore, Alice S
Early-onset breast cancer (EOBC) causes substantial loss of life and productivity, creating a major burden among women worldwide. We analyzed 1,265,548 Hapmap3 SNPs among a discovery set of 3,523 EOBC incident case and 2,702 population control women aged <=51 years. The SNPs with smallest P-values were examined in a replication set of 3,470 EOBC case and 5,475 control women. We also tested EOBC association with 19,684 genes by annotating each gene with putative functional SNPs, and then combining their P-values to obtain a gene-based P-value. We examined the gene with smallest P-value for replication in 1,145 breast cancer case and 1,142 control women. The combined discovery and replication sets identified 72 new SNPs associated with EOBC (P<4×10−8) located in six genomic regions previously reported to contain SNPs associated largely with later-onset breast cancer (LOBC). SNP rs2229882 and 10 other SNPs on chromosome 5q11.2 remained associated (P<6×10−4) after adjustment for the strongest published SNPs in the region. Thirty-two of the 82 currently known LOBC SNPs were associated with EOBC (P<0.05). Low power is likely responsible for the remaining 50 unassociated known LOBC SNPs. The gene-based analysis identified an association between breast cancer and the phosphofructokinase-muscle (PFKM) gene on chromosome 12q13.11 that met the genomewide gene-based threshold of 2.5×10−6. In conclusion, EOBC and LOBC appear to have similar genetic etiologies; the 5q11.2 region may contain multiple distinct breast cancer loci; and the PFKM gene region is worthy of further investigation. These findings should enhance our understanding of the etiology of breast cancer.
doi:10.1158/1055-9965.EPI-13-0340
PMCID: PMC3990360  PMID: 24493630
17.  Fine-mapping identifies two additional breast cancer susceptibility loci at 9q31.2 
Orr, Nick | Dudbridge, Frank | Dryden, Nicola | Maguire, Sarah | Novo, Daniela | Perrakis, Eleni | Johnson, Nichola | Ghoussaini, Maya | Hopper, John L. | Southey, Melissa C. | Apicella, Carmel | Stone, Jennifer | Schmidt, Marjanka K. | Broeks, Annegien | Van't Veer, Laura J. | Hogervorst, Frans B. | Fasching, Peter A. | Haeberle, Lothar | Ekici, Arif B. | Beckmann, Matthias W. | Gibson, Lorna | Aitken, Zoe | Warren, Helen | Sawyer, Elinor | Tomlinson, Ian | Kerin, Michael J. | Miller, Nicola | Burwinkel, Barbara | Marme, Frederik | Schneeweiss, Andreas | Sohn, Chistof | Guénel, Pascal | Truong, Thérèse | Cordina-Duverger, Emilie | Sanchez, Marie | Bojesen, Stig E. | Nordestgaard, Børge G. | Nielsen, Sune F. | Flyger, Henrik | Benitez, Javier | Zamora, Maria Pilar | Arias Perez, Jose Ignacio | Menéndez, Primitiva | Anton-Culver, Hoda | Neuhausen, Susan L. | Brenner, Hermann | Dieffenbach, Aida Karina | Arndt, Volker | Stegmaier, Christa | Hamann, Ute | Brauch, Hiltrud | Justenhoven, Christina | Brüning, Thomas | Ko, Yon-Dschun | Nevanlinna, Heli | Aittomäki, Kristiina | Blomqvist, Carl | Khan, Sofia | Bogdanova, Natalia | Dörk, Thilo | Lindblom, Annika | Margolin, Sara | Mannermaa, Arto | Kataja, Vesa | Kosma, Veli-Matti | Hartikainen, Jaana M. | Chenevix-Trench, Georgia | Beesley, Jonathan | Lambrechts, Diether | Moisse, Matthieu | Floris, Guiseppe | Beuselinck, Benoit | Chang-Claude, Jenny | Rudolph, Anja | Seibold, Petra | Flesch-Janys, Dieter | Radice, Paolo | Peterlongo, Paolo | Peissel, Bernard | Pensotti, Valeria | Couch, Fergus J. | Olson, Janet E. | Slettedahl, Seth | Vachon, Celine | Giles, Graham G. | Milne, Roger L. | McLean, Catriona | Haiman, Christopher A. | Henderson, Brian E. | Schumacher, Fredrick | Le Marchand, Loic | Simard, Jacques | Goldberg, Mark S. | Labrèche, France | Dumont, Martine | Kristensen, Vessela | Alnæs, Grethe Grenaker | Nord, Silje | Borresen-Dale, Anne-Lise | Zheng, Wei | Deming-Halverson, Sandra | Shrubsole, Martha | Long, Jirong | Winqvist, Robert | Pylkäs, Katri | Jukkola-Vuorinen, Arja | Grip, Mervi | Andrulis, Irene L. | Knight, Julia A. | Glendon, Gord | Tchatchou, Sandrine | Devilee, Peter | Tollenaar, Robertus A. E. M. | Seynaeve, Caroline M. | Van Asperen, Christi J. | Garcia-Closas, Montserrat | Figueroa, Jonine | Chanock, Stephen J. | Lissowska, Jolanta | Czene, Kamila | Darabi, Hatef | Eriksson, Mikael | Klevebring, Daniel | Hooning, Maartje J. | Hollestelle, Antoinette | van Deurzen, Carolien H. M. | Kriege, Mieke | Hall, Per | Li, Jingmei | Liu, Jianjun | Humphreys, Keith | Cox, Angela | Cross, Simon S. | Reed, Malcolm W. R. | Pharoah, Paul D. P. | Dunning, Alison M. | Shah, Mitul | Perkins, Barbara J. | Jakubowska, Anna | Lubinski, Jan | Jaworska-Bieniek, Katarzyna | Durda, Katarzyna | Ashworth, Alan | Swerdlow, Anthony | Jones, Michael | Schoemaker, Minouk J. | Meindl, Alfons | Schmutzler, Rita K. | Olswold, Curtis | Slager, Susan | Toland, Amanda E. | Yannoukakos, Drakoulis | Muir, Kenneth | Lophatananon, Artitaya | Stewart-Brown, Sarah | Siriwanarangsan, Pornthep | Matsuo, Keitaro | Ito, Hidema | Iwata, Hiroji | Ishiguro, Junko | Wu, Anna H. | Tseng, Chiu-chen | Van Den Berg, David | Stram, Daniel O. | Teo, Soo Hwang | Yip, Cheng Har | Kang, Peter | Ikram, Mohammad Kamran | Shu, Xiao-Ou | Lu, Wei | Gao, Yu-Tang | Cai, Hui | Kang, Daehee | Choi, Ji-Yeob | Park, Sue K. | Noh, Dong-Young | Hartman, Mikael | Miao, Hui | Lim, Wei Yen | Lee, Soo Chin | Sangrajrang, Suleeporn | Gaborieau, Valerie | Brennan, Paul | Mckay, James | Wu, Pei-Ei | Hou, Ming-Feng | Yu, Jyh-Cherng | Shen, Chen-Yang | Blot, William | Cai, Qiuyin | Signorello, Lisa B. | Luccarini, Craig | Bayes, Caroline | Ahmed, Shahana | Maranian, Mel | Healey, Catherine S. | González-Neira, Anna | Pita, Guillermo | Alonso, M. Rosario | Álvarez, Nuria | Herrero, Daniel | Tessier, Daniel C. | Vincent, Daniel | Bacot, Francois | Hunter, David J. | Lindstrom, Sara | Dennis, Joe | Michailidou, Kyriaki | Bolla, Manjeet K. | Easton, Douglas F. | dos Santos Silva, Isabel | Fletcher, Olivia | Peto, Julian
Human Molecular Genetics  2015;24(10):2966-2984.
We recently identified a novel susceptibility variant, rs865686, for estrogen-receptor positive breast cancer at 9q31.2. Here, we report a fine-mapping analysis of the 9q31.2 susceptibility locus using 43 160 cases and 42 600 controls of European ancestry ascertained from 52 studies and a further 5795 cases and 6624 controls of Asian ancestry from nine studies. Single nucleotide polymorphism (SNP) rs676256 was most strongly associated with risk in Europeans (odds ratios [OR] = 0.90 [0.88–0.92]; P-value = 1.58 × 10−25). This SNP is one of a cluster of highly correlated variants, including rs865686, that spans ∼14.5 kb. We identified two additional independent association signals demarcated by SNPs rs10816625 (OR = 1.12 [1.08–1.17]; P-value = 7.89 × 10−09) and rs13294895 (OR = 1.09 [1.06–1.12]; P-value = 2.97 × 10−11). SNP rs10816625, but not rs13294895, was also associated with risk of breast cancer in Asian individuals (OR = 1.12 [1.06–1.18]; P-value = 2.77 × 10−05). Functional genomic annotation using data derived from breast cancer cell-line models indicates that these SNPs localise to putative enhancer elements that bind known drivers of hormone-dependent breast cancer, including ER-α, FOXA1 and GATA-3. In vitro analyses indicate that rs10816625 and rs13294895 have allele-specific effects on enhancer activity and suggest chromatin interactions with the KLF4 gene locus. These results demonstrate the power of dense genotyping in large studies to identify independent susceptibility variants. Analysis of associations using subjects with different ancestry, combined with bioinformatic and genomic characterisation, can provide strong evidence for the likely causative alleles and their functional basis.
doi:10.1093/hmg/ddv035
PMCID: PMC4406292  PMID: 25652398
18.  MicroRNA Related Polymorphisms and Breast Cancer Risk 
Khan, Sofia | Greco, Dario | Michailidou, Kyriaki | Milne, Roger L. | Muranen, Taru A. | Heikkinen, Tuomas | Aaltonen, Kirsimari | Dennis, Joe | Bolla, Manjeet K. | Liu, Jianjun | Hall, Per | Irwanto, Astrid | Humphreys, Keith | Li, Jingmei | Czene, Kamila | Chang-Claude, Jenny | Hein, Rebecca | Rudolph, Anja | Seibold, Petra | Flesch-Janys, Dieter | Fletcher, Olivia | Peto, Julian | dos Santos Silva, Isabel | Johnson, Nichola | Gibson, Lorna | Aitken, Zoe | Hopper, John L. | Tsimiklis, Helen | Bui, Minh | Makalic, Enes | Schmidt, Daniel F. | Southey, Melissa C. | Apicella, Carmel | Stone, Jennifer | Waisfisz, Quinten | Meijers-Heijboer, Hanne | Adank, Muriel A. | van der Luijt, Rob B. | Meindl, Alfons | Schmutzler, Rita K. | Müller-Myhsok, Bertram | Lichtner, Peter | Turnbull, Clare | Rahman, Nazneen | Chanock, Stephen J. | Hunter, David J. | Cox, Angela | Cross, Simon S. | Reed, Malcolm W. R. | Schmidt, Marjanka K. | Broeks, Annegien | Veer, Laura J. V. a. n't. | Hogervorst, Frans B. | Fasching, Peter A. | Schrauder, Michael G. | Ekici, Arif B. | Beckmann, Matthias W. | Bojesen, Stig E. | Nordestgaard, Børge G. | Nielsen, Sune F. | Flyger, Henrik | Benitez, Javier | Zamora, Pilar M. | Perez, Jose I. A. | Haiman, Christopher A. | Henderson, Brian E. | Schumacher, Fredrick | Le Marchand, Loic | Pharoah, Paul D. P. | Dunning, Alison M. | Shah, Mitul | Luben, Robert | Brown, Judith | Couch, Fergus J. | Wang, Xianshu | Vachon, Celine | Olson, Janet E. | Lambrechts, Diether | Moisse, Matthieu | Paridaens, Robert | Christiaens, Marie-Rose | Guénel, Pascal | Truong, Thérèse | Laurent-Puig, Pierre | Mulot, Claire | Marme, Frederick | Burwinkel, Barbara | Schneeweiss, Andreas | Sohn, Christof | Sawyer, Elinor J. | Tomlinson, Ian | Kerin, Michael J. | Miller, Nicola | Andrulis, Irene L. | Knight, Julia A. | Tchatchou, Sandrine | Mulligan, Anna Marie | Dörk, Thilo | Bogdanova, Natalia V. | Antonenkova, Natalia N. | Anton-Culver, Hoda | Darabi, Hatef | Eriksson, Mikael | Garcia-Closas, Montserrat | Figueroa, Jonine | Lissowska, Jolanta | Brinton, Louise | Devilee, Peter | Tollenaar, Robert A. E. M. | Seynaeve, Caroline | van Asperen, Christi J. | Kristensen, Vessela N. | Slager, Susan | Toland, Amanda E. | Ambrosone, Christine B. | Yannoukakos, Drakoulis | Lindblom, Annika | Margolin, Sara | Radice, Paolo | Peterlongo, Paolo | Barile, Monica | Mariani, Paolo | Hooning, Maartje J. | Martens, John W. M. | Collée, J. Margriet | Jager, Agnes | Jakubowska, Anna | Lubinski, Jan | Jaworska-Bieniek, Katarzyna | Durda, Katarzyna | Giles, Graham G. | McLean, Catriona | Brauch, Hiltrud | Brüning, Thomas | Ko, Yon-Dschun | Brenner, Hermann | Dieffenbach, Aida Karina | Arndt, Volker | Stegmaier, Christa | Swerdlow, Anthony | Ashworth, Alan | Orr, Nick | Jones, Michael | Simard, Jacques | Goldberg, Mark S. | Labrèche, France | Dumont, Martine | Winqvist, Robert | Pylkäs, Katri | Jukkola-Vuorinen, Arja | Grip, Mervi | Kataja, Vesa | Kosma, Veli-Matti | Hartikainen, Jaana M. | Mannermaa, Arto | Hamann, Ute | Chenevix-Trench, Georgia | Blomqvist, Carl | Aittomäki, Kristiina | Easton, Douglas F. | Nevanlinna, Heli
PLoS ONE  2014;9(11):e109973.
Genetic variations, such as single nucleotide polymorphisms (SNPs) in microRNAs (miRNA) or in the miRNA binding sites may affect the miRNA dependent gene expression regulation, which has been implicated in various cancers, including breast cancer, and may alter individual susceptibility to cancer. We investigated associations between miRNA related SNPs and breast cancer risk. First we evaluated 2,196 SNPs in a case-control study combining nine genome wide association studies (GWAS). Second, we further investigated 42 SNPs with suggestive evidence for association using 41,785 cases and 41,880 controls from 41 studies included in the Breast Cancer Association Consortium (BCAC). Combining the GWAS and BCAC data within a meta-analysis, we estimated main effects on breast cancer risk as well as risks for estrogen receptor (ER) and age defined subgroups. Five miRNA binding site SNPs associated significantly with breast cancer risk: rs1045494 (odds ratio (OR) 0.92; 95% confidence interval (CI): 0.88–0.96), rs1052532 (OR 0.97; 95% CI: 0.95–0.99), rs10719 (OR 0.97; 95% CI: 0.94–0.99), rs4687554 (OR 0.97; 95% CI: 0.95–0.99, and rs3134615 (OR 1.03; 95% CI: 1.01–1.05) located in the 3′ UTR of CASP8, HDDC3, DROSHA, MUSTN1, and MYCL1, respectively. DROSHA belongs to miRNA machinery genes and has a central role in initial miRNA processing. The remaining genes are involved in different molecular functions, including apoptosis and gene expression regulation. Further studies are warranted to elucidate whether the miRNA binding site SNPs are the causative variants for the observed risk effects.
doi:10.1371/journal.pone.0109973
PMCID: PMC4229095  PMID: 25390939
19.  Confirmation of 5p12 as a susceptibility locus for progesterone-receptor-positive, lower grade breast cancer 
Milne, Roger L. | Goode, Ellen L. | García-Closas, Montserrat | Couch, Fergus J. | Severi, Gianluca | Hein, Rebecca | Fredericksen, Zachary | Malats, Núria | Zamora, M. Pilar | Pérez, Jose Ignacio Arias | Benítez, Javier | Dörk, Thilo | Schürmann, Peter | Karstens, Johann H. | Hillemanns, Peter | Cox, Angela | Brock, Ian W. | Elliot, Graeme | Cross, Simon S. | Seal, Sheila | Turnbull, Clare | Renwick, Anthony | Rahman, Nazneen | Shen, Chen-Yang | Yu, Jyh-Cherng | Huang, Chiun-Sheng | Hou, Ming-Feng | Nordestgaard, Børge G. | Bojesen, Stig E. | Lanng, Charlotte | Alnæs, Grethe Grenaker | Kristensen, Vessela | Børrensen-Dale, Anne-Lise | Hopper, John L. | Dite, Gillian S. | Apicella, Carmel | Southey, Melissa C. | Lambrechts, Diether | Yesilyurt, Betül T. | Floris, Giuseppe | Leunen, Karin | Sangrajrang, Suleeporn | Gaborieau, Valerie | Brennan, Paul | McKay, James | Chang-Claude, Jenny | Wang-Gohrke, Shan | Radice, Paolo | Peterlongo, Paolo | Manoukian, Siranoush | Barile, Monica | Giles, Graham G. | Baglietto, Laura | John, Esther M. | Miron, Alexander | Chanock, Stephen J. | Lissowska, Jolanta | Sherman, Mark E. | Figueroa, Jonine D. | Bogdanova, Natalia V. | Antonenkova, Natalia N. | Zalutsky, Iosif V. | Rogov, Yuri I. | Fasching, Peter A. | Bayer, Christian M. | Ekici, Arif B. | Beckmann, Matthias W. | Brenner, Hermann | Müller, Heiko | Arndt, Volker | Stegmaier, Christa | Andrulis, Irene L. | Knight, Julia A. | Glendon, Gord | Mulligan, Anna Marie | Mannermaa, Arto | Kataja, Vesa | Kosma, Veli-Matti | Hartikainen, Jaana M. | Meindl, Alfons | Heil, Joerg | Bartram, Claus R. | Schmutzler, Rita K. | Thomas, Gilles D. | Hoover, Robert N. | Fletcher, Olivia | Gibson, Lorna J. | Silva, Isabel dos Santos | Peto, Julian | Nickels, Stefan | Flesch-Janys, Dieter | Anton-Culver, Hoda | Ziogas, Argyrios | Sawyer, Elinor | Tomlinson, Ian | Kerin, Michael | Miller, Nicola | Schmidt, Marjanka K. | Broeks, Annegien | Van ‘t Veer, Laura J. | Tollenaar, Rob A.E.M. | Pharoah, Paul D.P. | Dunning, Alison M. | Pooley, Karen A. | Marme, Frederik | Schneeweiss, Andreas | Sohn, Christof | Burwinkel, Barbara | Jakubowska, Anna | Lubinski, Jan | Jaworska, Katarzyna | Durda, Katarzyna | Kang, Daehee | Yoo, Keun-Young | Noh, Dong-Young | Ahn, Sei-Hyun | Hunter, David J. | Hankinson, Susan E. | Kraft, Peter | Lindstrom, Sara | Chen, Xiaoqing | Beesley, Jonathan | Hamann, Ute | Harth, Volker | Justenhoven, Christina | Winqvist, Robert | Pylkäs, Katri | Jukkola-Vuorinen, Arja | Grip, Mervi | Hooning, Maartje | Hollestelle, Antoinette | Oldenburg, Rogier A. | Tilanus-Linthorst, Madeleine | Khusnutdinova, Elza | Bermisheva, Marina | Prokofieva, Darya | Farahtdinova, Albina | Olson, Janet E. | Wang, Xianshu | Humphreys, Manjeet K. | Wang, Qin | Chenevix-Trench, Georgia | Easton, Douglas F.
Background
The single nucleotide polymorphism 5p12-rs10941679has been found to be associated with risk of breast cancer, particularly estrogen receptor (ER)-positive disease. We aimed to further explore this association overall, and by tumor histopathology, in the Breast Cancer Association Consortium.
Methods
Data were combined from 37 studies, including 40,972 invasive cases, 1,398 cases of ductal carcinoma in situ (DCIS) and 46,334 controls, all of white European ancestry, as well as 3,007 invasive cases and 2,337 controls of Asian ancestry. Associations overall and by tumor invasiveness and histopathology were assessed using logistic regression.
Results
For white Europeans, the per-allele odds ratio (OR) associated with 5p12-rs10941679 was 1.11 (95% confidence interval [CI] =1.08–1.14, P=7×10−18) for invasive breast cancer and 1.10 (95%CI=1.01–1.21, P=0.03) for DCIS. For Asian women, the estimated OR for invasive disease was similar (OR=1.07, 95%CI=0.99–1.15, P=0.09). Further analyses suggested that the association in white Europeans was largely limited to progesterone receptor (PR)-positive disease (per-allele OR=1.16, 95%CI=1.12–1.20, P=1×10−18 versus OR=1.03, 95%CI=0.99–1.07, P=0.2 for PR-negative disease; P-heterogeneity=2×10−7); heterogeneity by estrogen receptor status was not observed (P=0.2) once PR status was accounted for. The association was also stronger for lower-grade tumors (per-allele OR [95%CI]=1.20 [1.14–1.25], 1.13 [1.09–1.16] and 1.04 [0.99–1.08] for grade 1, 2 and 3/4, respectively; P–trend=5×10−7).
Conclusion
5p12 is a breast cancer susceptibility locus for PR-positive, lower gradebreast cancer.
Impact
Multi-centre fine-mapping studies of this region are needed as a first step to identifying the causal variant or variants.
doi:10.1158/1055-9965.EPI-11-0569
PMCID: PMC4164116  PMID: 21795498
Breast cancer; SNP; susceptibility; disease subtypes
20.  Diagnostic chest x-rays and breast cancer risk before age 50 years for BRCA1 and BRCA2 mutation carriers 
Background
The effects of low-dose medical radiation on breast cancer risk are uncertain, and few studies have included genetically susceptible women, such as those who carry germline BRCA1 and BRCA2 mutations.
Methods
We studied 454 BRCA1 and 273 BRCA2 mutation carriers aged <50 years from three breast cancer family registries in the USA, Canada, and Australia/New Zealand. We estimated breast cancer risk associated with diagnostic chest x-rays by comparing mutation carriers with breast cancer (cases) with those without breast cancer (controls). Exposure to chest x-rays was self-reported. Mammograms were not considered in the analysis.
Results
After adjusting for known risk factors for breast cancer, the odds ratio (OR) for a history of diagnostic chest x-rays, excluding those for tuberculosis or pneumonia, was 1.16 (95% confidence interval (CI) = 0.64–2.11) for BRCA1 mutations carriers and 1.22 (95% CI=0.62–2.42) for BRCA2 mutations carriers. The OR was statistically elevated for BRCA2 mutation carriers with 3–5 diagnostic chest x-rays (p = 0.01), but not for those with 6 or more chest x-rays. Few women reported chest fluoroscopy for tuberculosis or chest x-rays for pneumonia; the OR estimates were elevated, but not statistically significant, for BRCA1 mutation carriers.
Conclusions
Our findings do not support a positive association between diagnostic chest x-rays and breast cancer risk before age 50 years for BRCA1 or BRCA2 mutation carriers.
Impact
Given the increasing use of diagnostic imaging involving higher ionizing radiation doses, further studies of genetically predisposed women are warranted.
doi:10.1158/1055-9965.EPI-13-0189
PMCID: PMC4015518  PMID: 23853209
breast cancer; BRCA1; BRCA2; chest x-rays; diagnostic radiation; epidemiology
21.  Using SNP genotypes to improve the discrimination of a simple breast cancer risk prediction model 
It has been shown that, for women aged 50 years or older, the discriminatory accuracy of the Breast Cancer Risk Prediction Tool (BCRAT) can be modestly improved by the inclusion of information on common single nucleotide polymorphisms (SNPs) that are associated with increased breast cancer risk. We aimed to determine whether a similar improvement is seen for earlier onset disease. We used the Australian Breast Cancer Family Registry to study a population-based sample of 962 cases aged 35 to 59 years and 463 controls frequency matched for age and for whom genotyping data was available.
Overall, the inclusion of data on seven SNPs improved the area under the receiver operating characteristic curve (AUC) from 0.58 (95% confidence interval [CI]=0.55–0.61) for BCRAT alone to 0.61 (95% CI=0.58–0.64) for BCRAT and SNP data combined (p<0.001). For women aged 35 to 39 years at interview, the corresponding improvement in AUC was from 0.61 (95% CI=0.56–0.66) to 0.65 (95% CI=0.60–0.70; p=0.03), while for women aged 40 to 49 years at diagnosis, the AUC improved from 0.61 (95% CI=0.55–0.66) to 0.63 (95% CI=0.57–0.69; p=0.04). Using previously used classifications of low, intermediate and high risk, 2.1% of cases and none of the controls aged 35 to 39 years, and 10.9% of cases and 4.0% of controls aged 40 to 49 years were classified into a higher risk group.
Including information on seven SNPs associated with breast cancer risk improves the discriminatory accuracy of BCRAT for women aged 35 to 39 years and 40 to 49 years. Given the low absolute risk for women in these age groups, only a small proportion are reclassified into a higher category for predicted 5-year risk of breast cancer.
doi:10.1007/s10549-013-2610-2
PMCID: PMC4059776  PMID: 23774992
Breast cancer; risk prediction; single nucleotide polymorphism; Breast Cancer Risk Assessment Tool
22.  Genetic variation at CYP3A is associated with age at menarche and breast cancer risk: a case-control study 
Johnson, Nichola | Dudbridge, Frank | Orr, Nick | Gibson, Lorna | Jones, Michael E | Schoemaker, Minouk J | Folkerd, Elizabeth J | Haynes, Ben P | Hopper, John L | Southey, Melissa C | Dite, Gillian S | Apicella, Carmel | Schmidt, Marjanka K | Broeks, Annegien | Van’t Veer, Laura J | Atsma, Femke | Muir, Kenneth | Lophatananon, Artitaya | Fasching, Peter A | Beckmann, Matthias W | Ekici, Arif B | Renner, Stefan P | Sawyer, Elinor | Tomlinson, Ian | Kerin, Michael | Miller, Nicola | Burwinkel, Barbara | Marme, Frederik | Schneeweiss, Andreas | Sohn, Christof | Guénel, Pascal | Truong, Therese | Cordina, Emilie | Menegaux, Florence | Bojesen, Stig E | Nordestgaard, Børge G | Flyger, Henrik | Milne, Roger | Zamora, M Pilar | Arias Perez, Jose Ignacio | Benitez, Javier | Bernstein, Leslie | Anton-Culver, Hoda | Ziogas, Argyrios | Clarke Dur, Christina | Brenner, Hermann | Müller, Heiko | Arndt, Volker | Dieffenbach, Aida Karina | Meindl, Alfons | Heil, Joerg | Bartram, Claus R | Schmutzler, Rita K | Brauch, Hiltrud | Justenhoven, Christina | Ko, Yon-Dschun | Nevanlinna, Heli | Muranen, Taru A | Aittomäki, Kristiina | Blomqvist, Carl | Matsuo, Keitaro | Dörk, Thilo | Bogdanova, Natalia V | Antonenkova, Natalia N | Lindblom, Annika | Mannermaa, Arto | Kataja, Vesa | Kosma, Veli-Matti | Hartikainen, Jaana M | Chenevix-Trench, Georgia | Beesley, Jonathan | Wu, Anna H | Van den Berg, David | Tseng, Chiu-Chen | Lambrechts, Diether | Smeets, Dominiek | Neven, Patrick | Wildiers, Hans | Chang-Claude, Jenny | Rudolph, Anja | Nickels, Stefan | Flesch-Janys, Dieter | Radice, Paolo | Peterlongo, Paolo | Bonanni, Bernardo | Pensotti, Valeria | Couch, Fergus J | Olson, Janet E | Wang, Xianshu | Fredericksen, Zachary | Pankratz, Vernon S | Giles, Graham G | Severi, Gianluca | Baglietto, Laura | Haiman, Chris | Simard, Jacques | Goldberg, Mark S | Labrèche, France | Dumont, Martine | Soucy, Penny | Teo, Soo | Yip, Cheng Har | Phuah, Sze Yee | Cornes, Belinda K | Kristensen, Vessela N | Grenaker Alnæs, Grethe | Børresen-Dale, Anne-Lise | Zheng, Wei | Winqvist, Robert | Pylkäs, Katri | Jukkola-Vuorinen, Arja | Grip, Mervi | Andrulis, Irene L | Knight, Julia A | Glendon, Gord | Mulligan, Anna Marie | Devillee, Peter | Figueroa, Jonine | Chanock, Stephen J | Lissowska, Jolanta | Sherman, Mark E | Hall, Per | Schoof, Nils | Hooning, Maartje | Hollestelle, Antoinette | Oldenburg, Rogier A | Tilanus-Linthorst, Madeleine | Liu, Jianjun | Cox, Angie | Brock, Ian W | Reed, Malcolm WR | Cross, Simon S | Blot, William | Signorello, Lisa B | Pharoah, Paul DP | Dunning, Alison M | Shah, Mitul | Kang, Daehee | Noh, Dong-Young | Park, Sue K | Choi, Ji-Yeob | Hartman, Mikael | Miao, Hui | Lim, Wei Yen | Tang, Anthony | Hamann, Ute | Försti, Asta | Rüdiger, Thomas | Ulmer, Hans Ulrich | Jakubowska, Anna | Lubinski, Jan | Jaworska-Bieniek, Katarzyna | Durda, Katarzyna | Sangrajrang, Suleeporn | Gaborieau, Valerie | Brennan, Paul | McKay, James | Slager, Susan | Toland, Amanda E | Vachon, Celine | Yannoukakos, Drakoulis | Shen, Chen-Yang | Yu, Jyh-Cherng | Huang, Chiun-Sheng | Hou, Ming-Feng | González-Neira, Anna | Tessier, Daniel C | Vincent, Daniel | Bacot, Francois | Luccarini, Craig | Dennis, Joe | Michailidou, Kyriaki | Bolla, Manjeet K | Wang, Jean | Easton, Douglas F | García-Closas, Montserrat | Dowsett, Mitch | Ashworth, Alan | Swerdlow, Anthony J | Peto, Julian | dos Santos Silva, Isabel | Fletcher, Olivia
Introduction
We have previously shown that a tag single nucleotide polymorphism (rs10235235), which maps to the CYP3A locus (7q22.1), was associated with a reduction in premenopausal urinary estrone glucuronide levels and a modest reduction in risk of breast cancer in women age ≤50 years.
Methods
We further investigated the association of rs10235235 with breast cancer risk in a large case control study of 47,346 cases and 47,570 controls from 52 studies participating in the Breast Cancer Association Consortium. Genotyping of rs10235235 was conducted using a custom Illumina Infinium array. Stratified analyses were conducted to determine whether this association was modified by age at diagnosis, ethnicity, age at menarche or tumor characteristics.
Results
We confirmed the association of rs10235235 with breast cancer risk for women of European ancestry but found no evidence that this association differed with age at diagnosis. Heterozygote and homozygote odds ratios (ORs) were OR = 0.98 (95% CI 0.94, 1.01; P = 0.2) and OR = 0.80 (95% CI 0.69, 0.93; P = 0.004), respectively (Ptrend = 0.02). There was no evidence of effect modification by tumor characteristics. rs10235235 was, however, associated with age at menarche in controls (Ptrend = 0.005) but not cases (Ptrend = 0.97). Consequently the association between rs10235235 and breast cancer risk differed according to age at menarche (Phet = 0.02); the rare allele of rs10235235 was associated with a reduction in breast cancer risk for women who had their menarche age ≥15 years (ORhet = 0.84, 95% CI 0.75, 0.94; ORhom = 0.81, 95% CI 0.51, 1.30; Ptrend = 0.002) but not for those who had their menarche age ≤11 years (ORhet = 1.06, 95% CI 0.95, 1.19, ORhom = 1.07, 95% CI 0.67, 1.72; Ptrend = 0.29).
Conclusions
To our knowledge rs10235235 is the first single nucleotide polymorphism to be associated with both breast cancer risk and age at menarche consistent with the well-documented association between later age at menarche and a reduction in breast cancer risk. These associations are likely mediated via an effect on circulating hormone levels.
doi:10.1186/bcr3662
PMCID: PMC4522594  PMID: 24887515
23.  Genetic Predisposition to In Situ and Invasive Lobular Carcinoma of the Breast 
Sawyer, Elinor | Roylance, Rebecca | Petridis, Christos | Brook, Mark N. | Nowinski, Salpie | Papouli, Efterpi | Fletcher, Olivia | Pinder, Sarah | Hanby, Andrew | Kohut, Kelly | Gorman, Patricia | Caneppele, Michele | Peto, Julian | dos Santos Silva, Isabel | Johnson, Nichola | Swann, Ruth | Dwek, Miriam | Perkins, Katherine-Anne | Gillett, Cheryl | Houlston, Richard | Ross, Gillian | De Ieso, Paolo | Southey, Melissa C. | Hopper, John L. | Provenzano, Elena | Apicella, Carmel | Wesseling, Jelle | Cornelissen, Sten | Keeman, Renske | Fasching, Peter A. | Jud, Sebastian M. | Ekici, Arif B. | Beckmann, Matthias W. | Kerin, Michael J. | Marme, Federick | Schneeweiss, Andreas | Sohn, Christof | Burwinkel, Barbara | Guénel, Pascal | Truong, Therese | Laurent-Puig, Pierre | Kerbrat, Pierre | Bojesen, Stig E. | Nordestgaard, Børge G. | Nielsen, Sune F. | Flyger, Henrik | Milne, Roger L. | Perez, Jose Ignacio Arias | Menéndez, Primitiva | Benitez, Javier | Brenner, Hermann | Dieffenbach, Aida Karina | Arndt, Volker | Stegmaier, Christa | Meindl, Alfons | Lichtner, Peter | Schmutzler, Rita K. | Lochmann, Magdalena | Brauch, Hiltrud | Fischer, Hans-Peter | Ko, Yon-Dschun | Nevanlinna, Heli | Muranen, Taru A. | Aittomäki, Kristiina | Blomqvist, Carl | Bogdanova, Natalia V. | Dörk, Thilo | Lindblom, Annika | Margolin, Sara | Mannermaa, Arto | Kataja, Vesa | Kosma, Veli-Matti | Hartikainen, Jaana M. | Chenevix-Trench, Georgia | Investigators, kConFab | Lambrechts, Diether | Weltens, Caroline | Van Limbergen, Erik | Hatse, Sigrid | Chang-Claude, Jenny | Rudolph, Anja | Seibold, Petra | Flesch-Janys, Dieter | Radice, Paolo | Peterlongo, Paolo | Bonanni, Bernardo | Volorio, Sara | Giles, Graham G. | Severi, Gianluca | Baglietto, Laura | Mclean, Catriona A. | Haiman, Christopher A. | Henderson, Brian E. | Schumacher, Fredrick | Le Marchand, Loic | Simard, Jacques | Goldberg, Mark S. | Labrèche, France | Dumont, Martine | Kristensen, Vessela | Winqvist, Robert | Pylkäs, Katri | Jukkola-Vuorinen, Arja | Kauppila, Saila | Andrulis, Irene L. | Knight, Julia A. | Glendon, Gord | Mulligan, Anna Marie | Devillee, Peter | Tollenaar, Rob A. E. M. | Seynaeve, Caroline M. | Kriege, Mieke | Figueroa, Jonine | Chanock, Stephen J. | Sherman, Mark E. | Hooning, Maartje J. | Hollestelle, Antoinette | van den Ouweland, Ans M. W. | van Deurzen, Carolien H. M. | Li, Jingmei | Czene, Kamila | Humphreys, Keith | Cox, Angela | Cross, Simon S. | Reed, Malcolm W. R. | Shah, Mitul | Jakubowska, Anna | Lubinski, Jan | Jaworska-Bieniek, Katarzyna | Durda, Katarzyna | Swerdlow, Anthony | Ashworth, Alan | Orr, Nicholas | Schoemaker, Minouk | Couch, Fergus J. | Hallberg, Emily | González-Neira, Anna | Pita, Guillermo | Alonso, M. Rosario | Tessier, Daniel C. | Vincent, Daniel | Bacot, Francois | Bolla, Manjeet K. | Wang, Qin | Dennis, Joe | Michailidou, Kyriaki | Dunning, Alison M. | Hall, Per | Easton, Doug | Pharoah, Paul | Schmidt, Marjanka K. | Tomlinson, Ian | Garcia-Closas, Montserrat
PLoS Genetics  2014;10(4):e1004285.
Invasive lobular breast cancer (ILC) accounts for 10–15% of all invasive breast carcinomas. It is generally ER positive (ER+) and often associated with lobular carcinoma in situ (LCIS). Genome-wide association studies have identified more than 70 common polymorphisms that predispose to breast cancer, but these studies included predominantly ductal (IDC) carcinomas. To identify novel common polymorphisms that predispose to ILC and LCIS, we pooled data from 6,023 cases (5,622 ILC, 401 pure LCIS) and 34,271 controls from 36 studies genotyped using the iCOGS chip. Six novel SNPs most strongly associated with ILC/LCIS in the pooled analysis were genotyped in a further 516 lobular cases (482 ILC, 36 LCIS) and 1,467 controls. These analyses identified a lobular-specific SNP at 7q34 (rs11977670, OR (95%CI) for ILC = 1.13 (1.09–1.18), P = 6.0×10−10; P-het for ILC vs IDC ER+ tumors = 1.8×10−4). Of the 75 known breast cancer polymorphisms that were genotyped, 56 were associated with ILC and 15 with LCIS at P<0.05. Two SNPs showed significantly stronger associations for ILC than LCIS (rs2981579/10q26/FGFR2, P-het = 0.04 and rs889312/5q11/MAP3K1, P-het = 0.03); and two showed stronger associations for LCIS than ILC (rs6678914/1q32/LGR6, P-het = 0.001 and rs1752911/6q14, P-het = 0.04). In addition, seven of the 75 known loci showed significant differences between ER+ tumors with IDC and ILC histology, three of these showing stronger associations for ILC (rs11249433/1p11, rs2981579/10q26/FGFR2 and rs10995190/10q21/ZNF365) and four associated only with IDC (5p12/rs10941679; rs2588809/14q24/RAD51L1, rs6472903/8q21 and rs1550623/2q31/CDCA7). In conclusion, we have identified one novel lobular breast cancer specific predisposition polymorphism at 7q34, and shown for the first time that common breast cancer polymorphisms predispose to LCIS. We have shown that many of the ER+ breast cancer predisposition loci also predispose to ILC, although there is some heterogeneity between ER+ lobular and ER+ IDC tumors. These data provide evidence for overlapping, but distinct etiological pathways within ER+ breast cancer between morphological subtypes.
Author Summary
Invasive lobular breast cancer (ILC) accounts for 10–15% of invasive breast cancer and is generally ER positive (ER+). To date, none of the genome-wide association studies that have identified loci that predispose to breast cancer in general or to ER+ or ER-negative breast cancer have focused on lobular breast cancer. In this lobular breast cancer study we identified a new variant that appears to be specific to this morphological subtype. We also ascertained which of the known variants predisposes specifically to lobular breast cancer and show for the first time that some of these loci are also associated with lobular carcinoma in situ, a non-obligate precursor of breast cancer and also a risk factor for contralateral breast cancer. Our study shows that the genetic pathways of invasive lobular cancer and ER+ ductal carcinoma mostly overlap, but there are important differences that are likely to provide insights into the biology of lobular breast tumors.
doi:10.1371/journal.pgen.1004285
PMCID: PMC3990493  PMID: 24743323
24.  Large-scale genotyping identifies 41 new loci associated with breast cancer risk 
Michailidou, Kyriaki | Hall, Per | Gonzalez-Neira, Anna | Ghoussaini, Maya | Dennis, Joe | Milne, Roger L | Schmidt, Marjanka K | Chang-Claude, Jenny | Bojesen, Stig E | Bolla, Manjeet K | Wang, Qin | Dicks, Ed | Lee, Andrew | Turnbull, Clare | Rahman, Nazneen | Fletcher, Olivia | Peto, Julian | Gibson, Lorna | Silva, Isabel dos Santos | Nevanlinna, Heli | Muranen, Taru A | Aittomäki, Kristiina | Blomqvist, Carl | Czene, Kamila | Irwanto, Astrid | Liu, Jianjun | Waisfisz, Quinten | Meijers-Heijboer, Hanne | Adank, Muriel | van der Luijt, Rob B | Hein, Rebecca | Dahmen, Norbert | Beckman, Lars | Meindl, Alfons | Schmutzler, Rita K | Müller-Myhsok, Bertram | Lichtner, Peter | Hopper, John L | Southey, Melissa C | Makalic, Enes | Schmidt, Daniel F | Uitterlinden, Andre G | Hofman, Albert | Hunter, David J | Chanock, Stephen J | Vincent, Daniel | Bacot, François | Tessier, Daniel C | Canisius, Sander | Wessels, Lodewyk F A | Haiman, Christopher A | Shah, Mitul | Luben, Robert | Brown, Judith | Luccarini, Craig | Schoof, Nils | Humphreys, Keith | Li, Jingmei | Nordestgaard, Børge G | Nielsen, Sune F | Flyger, Henrik | Couch, Fergus J | Wang, Xianshu | Vachon, Celine | Stevens, Kristen N | Lambrechts, Diether | Moisse, Matthieu | Paridaens, Robert | Christiaens, Marie-Rose | Rudolph, Anja | Nickels, Stefan | Flesch-Janys, Dieter | Johnson, Nichola | Aitken, Zoe | Aaltonen, Kirsimari | Heikkinen, Tuomas | Broeks, Annegien | Van’t Veer, Laura J | van der Schoot, C Ellen | Guénel, Pascal | Truong, Thérèse | Laurent-Puig, Pierre | Menegaux, Florence | Marme, Frederik | Schneeweiss, Andreas | Sohn, Christof | Burwinkel, Barbara | Zamora, M Pilar | Perez, Jose Ignacio Arias | Pita, Guillermo | Alonso, M Rosario | Cox, Angela | Brock, Ian W | Cross, Simon S | Reed, Malcolm W R | Sawyer, Elinor J | Tomlinson, Ian | Kerin, Michael J | Miller, Nicola | Henderson, Brian E | Schumacher, Fredrick | Le Marchand, Loic | Andrulis, Irene L | Knight, Julia A | Glendon, Gord | Mulligan, Anna Marie | Lindblom, Annika | Margolin, Sara | Hooning, Maartje J | Hollestelle, Antoinette | van den Ouweland, Ans M W | Jager, Agnes | Bui, Quang M | Stone, Jennifer | Dite, Gillian S | Apicella, Carmel | Tsimiklis, Helen | Giles, Graham G | Severi, Gianluca | Baglietto, Laura | Fasching, Peter A | Haeberle, Lothar | Ekici, Arif B | Beckmann, Matthias W | Brenner, Hermann | Müller, Heiko | Arndt, Volker | Stegmaier, Christa | Swerdlow, Anthony | Ashworth, Alan | Orr, Nick | Jones, Michael | Figueroa, Jonine | Lissowska, Jolanta | Brinton, Louise | Goldberg, Mark S | Labrèche, France | Dumont, Martine | Winqvist, Robert | Pylkäs, Katri | Jukkola-Vuorinen, Arja | Grip, Mervi | Brauch, Hiltrud | Hamann, Ute | Brüning, Thomas | Radice, Paolo | Peterlongo, Paolo | Manoukian, Siranoush | Bonanni, Bernardo | Devilee, Peter | Tollenaar, Rob A E M | Seynaeve, Caroline | van Asperen, Christi J | Jakubowska, Anna | Lubinski, Jan | Jaworska, Katarzyna | Durda, Katarzyna | Mannermaa, Arto | Kataja, Vesa | Kosma, Veli-Matti | Hartikainen, Jaana M | Bogdanova, Natalia V | Antonenkova, Natalia N | Dörk, Thilo | Kristensen, Vessela N | Anton-Culver, Hoda | Slager, Susan | Toland, Amanda E | Edge, Stephen | Fostira, Florentia | Kang, Daehee | Yoo, Keun-Young | Noh, Dong-Young | Matsuo, Keitaro | Ito, Hidemi | Iwata, Hiroji | Sueta, Aiko | Wu, Anna H | Tseng, Chiu-Chen | Van Den Berg, David | Stram, Daniel O | Shu, Xiao-Ou | Lu, Wei | Gao, Yu-Tang | Cai, Hui | Teo, Soo Hwang | Yip, Cheng Har | Phuah, Sze Yee | Cornes, Belinda K | Hartman, Mikael | Miao, Hui | Lim, Wei Yen | Sng, Jen-Hwei | Muir, Kenneth | Lophatananon, Artitaya | Stewart-Brown, Sarah | Siriwanarangsan, Pornthep | Shen, Chen-Yang | Hsiung, Chia-Ni | Wu, Pei-Ei | Ding, Shian-Ling | Sangrajrang, Suleeporn | Gaborieau, Valerie | Brennan, Paul | McKay, James | Blot, William J | Signorello, Lisa B | Cai, Qiuyin | Zheng, Wei | Deming-Halverson, Sandra | Shrubsole, Martha | Long, Jirong | Simard, Jacques | Garcia-Closas, Montse | Pharoah, Paul D P | Chenevix-Trench, Georgia | Dunning, Alison M | Benitez, Javier | Easton, Douglas F
Nature genetics  2013;45(4):353-361e2.
Breast cancer is the most common cancer among women. Common variants at 27 loci have been identified as associated with susceptibility to breast cancer, and these account for ~9% of the familial risk of the disease. We report here a meta-analysis of 9 genome-wide association studies, including 10,052 breast cancer cases and 12,575 controls of European ancestry, from which we selected 29,807 SNPs for further genotyping. These SNPs were genotyped in 45,290 cases and 41,880 controls of European ancestry from 41 studies in the Breast Cancer Association Consortium (BCAC). The SNPs were genotyped as part of a collaborative genotyping experiment involving four consortia (Collaborative Oncological Gene-environment Study, COGS) and used a custom Illumina iSelect genotyping array, iCOGS, comprising more than 200,000 SNPs. We identified SNPs at 41 new breast cancer susceptibility loci at genome-wide significance (P < 5 × 10−8). Further analyses suggest that more than 1,000 additional loci are involved in breast cancer susceptibility.
doi:10.1038/ng.2563
PMCID: PMC3771688  PMID: 23535729
25.  A role for XRCC2 gene polymorphisms in breast cancer risk and survival 
Journal of medical genetics  2011;48(7):477-484.
Background
The XRCC2 gene is a key mediator in the homologous recombination repair of DNA double strand breaks. We hypothesised that inherited variants in the XRCC2 gene might also affect susceptibility to, and survival from, breast cancer.
Methods
We genotyped 12 XRCC2 tagging SNPs in 1,131 breast cancer cases and 1,148 controls from the Sheffield Breast Cancer Study (SBCS), and examined their associations with breast cancer risk and survival by estimating odds ratios (ORs) and hazard ratios (HRs), and their corresponding 95% confidence intervals (CIs). Positive findings were further investigated in 860 cases and 869 controls from the Utah Breast Cancer Study (UBCS) and jointly analysed together with available published data for breast cancer risk. The survival findings were further confirmed in studies (8,074 cases) from the Breast Cancer Association Consortium (BCAC).
Results
The most significant association with breast cancer risk in the SBCS dataset was the XRCC2 rs3218408 SNP (recessive model p=2.3×10−4, MAF=0.23). This SNP yielded an ORrec (95% CI) of 1.64 (1.25–2.16) in a two-site analysis of SBCS and UBCS, and a meta-ORrec (95% CI) of 1.33 (1.12–1.57) when all published data were included. This SNP may mark a rare risk haplotype carried by 2 in 1000 of the control population. Furthermore, the XRCC2 coding R188H SNP (rs3218536, MAF=0.08) was significantly associated with poor survival, with an increased per-allele HR (95% CI) of 1.58 (1.01–2.49) in a multivariate analysis. This effect was still evident in a pooled meta-analysis of 8,781 breast cancer patients from the BCAC [HR (95% CI) of 1.19 (1.05–1.36), p=0.01].
Conclusions
Our findings suggest that XRCC2 SNPs may influence breast cancer risk and survival.
doi:10.1136/jmedgenet-2011-100018
PMCID: PMC3932658  PMID: 21632523
Single nucleotide polymorphism; XRCC2; breast cancer risk; breast cancer survival

Results 1-25 (57)