Obesity and vitamin D deficiency are associated with risk for several cancers, possibly through inflammation and adipokine-related pathways. 218 postmenopausal women with BMI>25 kg/m2 and low serum 25-hydroxyvitamin D (25(OH)D; ≥10-<32 ng/mL), were randomized to 12-months of either (i) weight-loss intervention + 2000 IU/day oral vitamin D3 or (ii) weight-loss intervention + daily placebo. Serum adiponectin, leptin, tumor necrosis factor-alpha (TNF-α), Interleukin (IL)-6; IL-1β; IL-8 and IL-10, were measured by immunoassay, and a composite inflammatory biomarker score calculated. Using generalized estimating equations, mean changes in outcomes were compared between arms (intent-to-treat), adjusted for possible confounders. Analyses were also stratified by weight-loss (gained/no weight-loss; <5%; 5-10%; ≥10%). At 12-months, there were no significant differences in analyte changes between arms. In stratified analyses, participants randomized to vitamin D3who lost 5-10% of baseline weight, vs. participants who gained weight/had no weight-loss, had significantly greater decreases in levels of IL-6 compared to those randomized to placebo: absolute change -0.75 pg/mL (-17.2%) Placebo vs. -1.77 pg/mL (-37.3%) Vitamin D, P=0.004. Similar but attenuated results were observed for participants who lost ≥10% of baseline weight: -0.41 pg/mL (-13.6%) Placebo vs. -0.67 pg/mL (-17.3%) Vitamin D, P=0.02. Effects of vitamin D3 supplementation on levels of IL-1β were inconsistent when stratified by weight loss. There were no intervention effects on IL-10, TNF-α, IL-8, the composite score, adiponectin or leptin, when stratified by weight-loss. In conclusion, Vitamin D3 supplementation in combination with weight-loss of at least 5% of baseline weight was associated with significant reductions in levels of IL-6.
Maintenance of normal weight and higher levels of physical activity are associated with a reduced risk of several types of cancer. As genomic instability is regarded as a hallmark of cancer development, one proposed mechanism is improvement of DNA repair function. We investigated links between dietary weight loss, exercise, and strand break rejoining in an ancillary study to a randomized-controlled trial.
Overweight/obese postmenopausal women (n=439) were randomized to: a) reduced-calorie weight-loss diet (“diet” n=118); b) moderate-to-vigorous intensity aerobic exercise (“exercise” n=117); c) a combination (“diet+exercise” n=117); or d) control (n=87). The reduced-calorie diet had a 10% weight-loss goal. The exercise intervention consisted of 45 minutes of moderate-to-vigorous aerobic activity 5 days/week for 12 months. DNA repair capacity was measured in a subset of 226 women at baseline and 12 months, from cryopreserved peripheral mononuclear cells using the Comet assay. Anthropometric and body composition measures were performed at baseline and 12 months.
DNA repair capacity did not change significantly with any of the 12 month interventions compared to control; there were also no significant changes when stratified by changes in body composition or aerobic fitness (VO2max). At baseline, DNA repair capacity was positively associated with weight, BMI, and fat mass (r=0.20, p=0.003; r=0.19, p=0.004; r=0.13, p=0.04, respectively) and inversely with lean body mass (r=-0.14, p=0.04).
In conclusion, DNA repair capacity did not change with dietary weight loss or exercise interventions in postmenopausal women within a period of 12 months. Other assays that capture different facets of DNA repair function may be needed.
DNA repair; Comet Assay; randomized controlled trial; exercise; caloric restriction; women
The lack of breast cancer screening in low and middle‐income countries results in later stage diagnosis and worsened outcomes for women. A cluster randomized trial was performed in Bogotá, Colombia between 2008 and 2012 to evaluate effects of opportunistic breast cancer screening. Thirteen clinics were randomized to an intervention arm and 13 to a control arm. Physicians in intervention clinics were instructed to perform clinical breast examination on all women aged 50–69 years attending clinics for non‐breast health issues, and then refer them for mammographic screening. Physicians in control clinics were not explicitly instructed to perform breast screening or mammography referrals, but could do so if they thought it indicated (“usual care”). Women were followed for 2‐years postrandomization. 7,436 women were enrolled and 7,419 (99.8%) screened in intervention clinics, versus 8,419 enrolled and 1,108 (13.1%) screened in control clinics. Incidence ratios (IR) of early, advanced and all breast cancers were 2.9 (95% CI 1.1–9.2), 1.0 (0.3–3.5) and 1.9 (0.9–4.1) in the first (screening) year of the trial, and the cumulative IR for all breast cancers converged to 1.4 (0.7–2.8) by the end of follow‐up (Year 2). Eighteen (69.2%) of 26 women with early stage disease had breast conservation surgery (BCS) versus 6 (42.5%) of 14 women with late‐stage disease (p = 0.02). Fifteen (68.2%) of 22 women with breast cancer in the intervention group had BCS versus nine (50.0%) of 18 women in the control group (p = 0.34). Well‐designed opportunistic clinic‐based breast cancer screening programs may be useful for early breast cancer detection in LMICs.
Breast cancer is a common malignancy in Colombia, and its mortality rates are rising. To catch the disease earlier, recently developed guidelines from the National Cancer Institute of Colombia center on opportunistic (hospital‐based) screening with biennial mammography and clinical breast examination. In this randomized trial involving patients at primary health‐care clinics in Bogotá, opportunistic breast screening was associated with increased rates of disease detection and use of breast‐conservation therapy. Cancers were diagnosed at earlier stages in women who underwent screening versus usual care. The data suggest that opportunistic breast screening can advance early detection in low‐resource settings.
low and middle income countries; breast cancer; opportunistic screening; cluster randomized controlled trial
Compensatory metabolic changes that accompany weight loss, e.g., increased ghrelin, contribute to weight regain and difficulty in long-term weight loss maintenance; however, the separate effects of long-term caloric restriction and exercise on total circulating ghrelin in humans is unknown.
A 12-month randomized controlled trial comparing: i) dietary weight loss with a 10% weight loss goal (‘diet’; n=118); ii) moderate-to-vigorous intensity aerobic exercise for 45 min/day, 5 days/week (‘exercise’; n=117); iii) dietary weight loss and exercise (‘diet + exercise’; n=117); or iv) no-lifestyle-change control (n=87). Participants: 439 overweight or obese postmenopausal women (50-75 y).
Fasting total serum ghrelin was measured by radioimmunoassay at baseline and 12 months. Fasting serum leptin, adiponectin, and insulin were also measured.
Fasting total ghrelin significantly increased in the diet + exercise arm (+7.4%, p=0.008) but not in either the diet (+6.5%, p=0.07) or exercise (+1.0%, p=0.53) arms compared to control. Greater weight loss was associated with increased ghrelin concentrations, regardless of intervention. Neither baseline ghrelin nor body composition modified the intervention effects on changes in total ghrelin. The 12-month change in total ghrelin was inversely associated with changes in leptin, insulin, and insulin resistance, and positively associated with change in adiponectin.
Greater weight loss, achieved through a reduced calorie diet or exercise, is associated with increased total ghrelin concentrations in overweight or obese postmenopausal women.
caloric restriction; lifestyle; satiety; hormones
Latinos and rural residents are less active and have a greater prevalence of overweight/obesity compared with their non-Latino white and urban counterparts. The objective of this study was to assess the active living environment in four rural, predominantly Latino communities.
Assessments were taken using the Rural Active Living Assessment (RALA) in four rural predominantly Latino communities in Central Washington from September–November 2013. Street Segment Assessments of town center, thoroughfare, neighborhood and school zones were assessed for features related to walkability. Physical activity amenities, programs and policies in each town were assessed. Scores were generated for amenities, programs and policies. Data were analyzed with descriptive statistics and logistic regression.
A total of 103 segments were assessed. Sidewalks in good condition were present in 32% of segments and shoulders in 44% of segments. Half of street segments were rated as walkable. Parks and playgrounds were available; however, half of these were rated in poor condition. All four districts offered after school physical activity programming but only two had a late bus option.
These four rural towns have some policies, programming and infrastructure in place that support active living. The information from the RALA can be used to inform program and policy development to enhance physical activity in these rural communities.
•Parks and playgrounds were available in all four rural communities.•All four school districts allowed public access to facilities after school hours.•Less than half of street segments had sidewalks or shoulders.•Half of street segments were rated as walkable.
Physical activity; Rural; Active living; Latino; Hispanic; Built environment
Telomere shortening is associated with increasing age, male gender and lifestyle factors such as obesity and smoking. Inflammation has also been implicated in cellular senescence and may promote telomere shortening in chronic conditions such as obesity and diabetes. However, little is known about the relationship between markers of obesity and inflammation, and leukocyte telomere length (LTL).
LTL was measured using quantitative polymerase chain reaction in peripheral leukocytes from 295 individuals diagnosed with Barrett’s esophagus (BE) between 1995 and 2009. Data on lifestyle variables including obesity and smoking were collected at in-person interviews. Biomarkers of obesity (leptin, adiponectin), diabetes (glucose, insulin), inflammation (C-reactive protein, Interleukin-6, surface tumor necrosis factor receptor (sTNFR) I & II) and oxidative stress (F2-isoprostanes) were measured in stored blood samples. We examined associations between these covariates and LTL in a cross-sectional analysis using linear and logistic regression models, adjusting for possible confounders.
LTL was significantly associated with age (r = −0.30, p < 0.001), gender (r = 0.14 for females, p = 0.01) and inversely associated with cigarette pack-years (r = −0.11, p = 0.04). Odds of having short LTL were significantly higher for participants in the highest tertile for sTNF-RI (Odds ratio adjusted for age, gender, smoking, and obesity = 2.19; 95 % CI 1.00–4.85, p-trend = 0.02). LTL was not significantly associated with any other lifestyle factors, including smoking or obesity, or other inflammation-, obesity-/diabetes-related biomarkers measured.
Increasing age, male gender, smoking history, and sTNF-RI levels were associated with short LTL among persons with BE but no correlations were observed between LTL and other inflammatory markers or measures of obesity. Larger longitudinal studies are necessary in order to further establish the potential relationships between obesity, inflammation markers and LTL.
Epidemiologic studies suggest a reduced risk of breast cancer among women who use aspirin. A plausible mechanism is through aspirin’s effect on estrogens, possibly mediated through interference with estrogen synthesis via reduction in inflammation, which is increased in adipose tissues including breast. In a randomized placebo-controlled trial, we evaluated the effects of 6-months administration of 325 mg/day aspirin on serum estrogens (estradiol, estrone, free estradiol, bioavailable estradiol) and sex hormone binding globulin [SHBG] in 144 healthy postmenopausal women. Eligible participants, recruited 2005 - 2007, were not taking nonsteroidal anti-inflammatory medication including aspirin > 2 times/week or menopausal hormone therapy, and had a BI-RAD mammographic density classification of 2, 3, or 4. The intervention effects (intent-to-treat) were evaluated by differences in the geometric mean outcome changes at 6 months between aspirin and placebo groups using generalized estimating equations (GEE). Participants were a mean 59.4 (SD 5.4) years, with mean body mass index (BMI) of 26.4 (SD) 5.4 kg/m2. Between baseline and 6-months, none of the serum estrogens or SHBG changed substantially and there were no differences between groups. Stratifying by BMI did not change results. In conclusion, a single daily administration of 325 mg of aspirin for 6 months had no effect on serum estrogens or SHBG in postmenopausal women. Larger doses or longer duration of aspirin administration may be needed to affect circulating estrogens. Alternately, if aspirin influences breast cancer risk in postmenopausal women, it may do so through direct breast tissue effects, or through pathways other than estrogens.
aspirin; NSAIDs; estrogen; estradiol; estrone; body mass index; breast cancer
The inverse association between physical activity and cancer risk may be mediated by higher melatonin levels. However,few studies have examined the effect of increased physical activity on melatonin levels.
The parent study was a randomized controlled trial (RCT) which randomized 51 men and 49 women to a 12-month moderate-to-vigorous aerobic exercise intervention (‘exercisers’) and 51 men and 51 women to a stretching control (‘controls’). Participants were aged 40-75 years, and previously sedentary. Levels of the principal urinary metabolite of melatonin 6-sulphatoxymelatonin (aMT6s), corrected for creatinine levels, were measured in spot morning urine samples by immunoassay at baseline and 12-months. Changes in levels between exercisers and controls were compared using generalized estimating equations for linear regression.
We observed no statistically significant difference in the change in aMT6s levels from baseline to 12-months in exercisers compared with controls (change in aMT6s levels: exercisers, +6.5%; controls, +13%; P=0.66). There was no evidence of effect modification by age, sex or body mass index.
A 12-month moderate-intensity exercise intervention did not affect levels of aMT6s.
Further research needs to focus on other potential mechanisms through which physical activity may reduce the risk of cancer.
aMT6s; cancer; exercise; sedentary; sex hormones
Increased physical activity is associated with decreased risk of several types of cancer, but underlying mechanisms are poorly understood. Angiogenesis, where new blood vessels are formed, is common to adipose tissue formation/remodelling and tumor vascularization.
We examined effects of a 12-month 45 minutes/day, 5 days/week moderate-intensity aerobic exercise intervention, on four serum markers of angiogenesis in 173 sedentary, overweight, postmenopausal women, 50–75 years, randomized to intervention vs. stretching control. Circulating levels of positive regulators of angiogenesis (vascular endothelial growth factor (VEGF), osteopontin (OPN), plasminogen activator inhibitor-1 (PAI-1)); and the negative regulator pigment epithelium-derived factor (PEDF), were measured by immunoassay at baseline and 12-months. Changes were compared using generalized estimating equations, adjusting for baseline levels of analytes and BMI.
VEGF, OPN or PAI-1 levels did not differ by intervention arm. Participants randomized to exercise significantly reduced PEDF (−3.7%) vs. controls (+3.0%; P=0.009). Reductions in fat-mass were significantly associated with reductions in PAI-1 (Ptrend=0.03; Ptrend=0.02) and PEDF (Ptrend=0.002; Ptrend=0.01) compared to controls, or to those who gained any fat-mass respectively. There was a significant association between decreases in VO2max, and increased reductions in PEDF (Ptrend=0.03), compared to participants who increased their level of fitness.
Fat-loss reduces circulating PAI-1 and PEDF. Changes in VO2max are associated with alterations in PEDF, but these associations are complex.
Unexpected reductions in PEDF with decreasing fat-mass, and with decreasing VO2max, warrants further study, including examining effects of different types and intensities of exercise; and role of dietary weight-loss with and without exercise.
Angiogenesis; exercise; VEGF; PAI-1; PEDF; osteopontin
Progressive telomere shortening with cell division is a hallmark of aging. Short telomeres are associated with increased cancer risk, but there are conflicting reports about telomere length and mortality in breast cancer survivors.
We measured peripheral blood leukocyte telomere length at two time points in women enrolled in a multiethnic, prospective cohort of stage I to stage IIIA breast cancer survivors diagnosed between 1995 and 1999 with a median follow-up of 11.2 years. We evaluated associations between telomere length measured at mean 6 (baseline; LTL0; n = 611) and 30 months (LTL30; n = 478) after diagnosis and the change between those time points (n = 478), with breast cancer–specific and all-cause mortality using Cox proportional hazards models adjusted for possible confounders. Statistical tests were two-sided.
There were 135 deaths, of which 74 were due to breast cancer. Neither baseline nor 30-month telomere length was associated with either all-cause or breast cancer–specific mortality (LTL0: hazard ratio [HR] = 0.83, 95% confidence interval [CI] = 0.67 to 1.02; HR = 0.88; 95% CI = 0.67 to 1.15; LTL30: HR = 0.78, 95% CI = 0.59 to 1.05; HR = 0.86; 95% = CI = 0.58 to 1.26, respectively). However, participants whose telomeres shortened between baseline and 30 months were at a statistically significantly increased risk of breast cancer–specific (HR = 3.03; 95% CI = 1.11 to 8.18) and all-cause mortality (HR = 2.38; 95% CI = 1.28 to 4.39) compared with participants whose telomeres lengthened. When follow-up was censored at 5-years after diagnosis, LTL0 (HR = 0.66; 95% CI = 0.45 to 0.96), LTL30 (HR = 0.51; 95% CI = 0.29 to 0.92), and change in telomere length (HR = 3.45; 95% CI = 1.11 to 10.75) were statistically significantly associated with all-cause mortality.
Telomere shortening was associated with increased risk of breast cancer–specific and all-cause mortality, suggesting that change in blood telomere length over time could be a biomarker of prognosis. Research on determinants of telomere length and change is needed.
Hispanic women living on the US-México border experience health disparities, are less likely to access cervical cancer screening services, and have a higher rate of cervical cancer incidence compared to women living in non-border areas. Here we investigate the effects of an intervention delivered by community health workers (CHWs, known as lay health educators or Promotores de Salud in Spanish) on rates of cervical cancer screening in Hispanic women who were out of compliance with recommended screening guidelines.
Hispanic women out of compliance with screening guidelines, attending clinics in southern New México (NM), were identified using medical record review. All eligible women were offered the intervention. The study was conducted between 2009 and 2011, and data were analyzed in 2012. Setting/participants - 162 Hispanic women, resident in NM border counties, aged 29-80 years, who had not had a Pap test within the past 3 years. Intervention - A CHW-led, culturally appropriate, computerized education intervention. Main outcome measures - The percentage of women who underwent cervical cancer screening within 12 months of receiving the intervention. Change in knowledge of, and attitudes towards cervical cancer and screening as assessed by a baseline and follow-up questionnaire.
76.5% of women had a Pap test after the intervention. Women displayed increased knowledge about cervical cancer screening and about HPV.
A culturally appropriate promotora-led intervention is successful in increasing cervical cancer screening in at-risk Hispanic women on the US-México border.
cervical cancer screening; community health workers; education intervention; health disparities; health promotion
Obesity and weight-loss are associated with methylation patterns in specific genes, but their effect on Long Interspersed Nuclear Elements (LINE-1) methylation, a measure of global methylation is largely unknown.
Three hundred overweight/obese post-menopausal women (50–75 years) were part of a completed, 1-year randomized controlled trial, comparing independent and combined effects of a reduced-calorie weight-loss diet, and exercise program, vs. control. DNA was extracted from peripheral blood leukocytes collected at baseline and 12-months, and LINE-1 methylation analyzed by pyrosequencing. We compared mean changes between groups using generalized estimating equations and examined effects of weight-loss on LINE-1 methylation using stratified analyses (gained weight/no weight-loss (N=84); <5% (N=45); 5–10% (N=45); >10% of baseline weight-loss (N=126)) within each arm, adjusted by blood cell counts. We also examined associations between LINE-1 methylation and previously measured biomarkers, and anthropometrics.
No significant difference in LINE-1 methylation levels was detected in any intervention group vs. controls. The magnitude of weight-loss was not associated with LINE-1 methylation at 12-months. There were no associations between baseline characteristics of participants, or previously measured biomarkers, and LINE-1 methylation.
Our results suggest that lifestyle changes sufficient to significantly reduce weight over 12-months may not change LINE-1 DNA methylation levels.
LINE-1 methylation; weight loss; randomized controlled trial
Antidepressants may attenuate the effects of diet and exercise programs. We compared adherence and changes in body measures and biomarkers of glucose metabolism and inflammation between antidepressant users and non-users in a 12-month randomized controlled trial.
Overweight or obese, postmenopausal women were assigned to: diet (10% weight loss goal, N=118); moderate-to-vigorous aerobic exercise (225 minutes/week, N=117); diet+exercise (N=117); and control (N=87) in Seattle, WA 2005–2009. Women using antidepressants at baseline were classified as users (N=109). ANCOVA and generalized estimating equation approaches, respectively, were used to compare adherence (exercise amount, diet session attendance, and changes in percent calorie intake from fat, cardiopulmonary fitness, and pedometer steps) and changes in body measures (weight, waist and percent body fat) and serum biomarkers (glucose, insulin, homeostasis assessment-insulin resistance, and high-sensitivity C-reactive protein) between users and non-users. An interaction term (intervention × antidepressant use) tested effect modification.
There were no differences in adherence except diet session attendance was lower among users in the diet+exercise group (P<0.05 vs. non-users). Changes in body measures and serum biomarkers did not differ by antidepressant use (Pinteraction>0.05).
Dietary weight loss and exercise improved body measures and biomarkers of glucose metabolism and inflammation independent of antidepressant use.
Obesity; weight loss intervention; antidepressants; diet; exercise
Excess body weight and a sedentary lifestyle are associated with the development of several diseases, including cardiovascular disease, diabetes, and cancer in women. One proposed mechanism linking obesity to chronic diseases is an alteration in adipose-derived adiponectin and leptin levels. We investigated the effects of 12-month reduced calorie, weight loss and exercise interventions on adiponectin and leptin concentrations.
Overweight/obese postmenopausal women (n=439) were randomized as follows: 1) a reduced calorie, weight loss diet (diet; N=118); 2) moderate-to-vigorous intensity aerobic exercise (exercise; N=117); 3) a combination of a reduced calorie, weight loss diet and moderate-to-vigorous intensity aerobic exercise (diet+exercise; N=117); or 4) control (N=87). The reduced calorie diet had a 10% weight loss goal. The exercise intervention consisted of 45 minutes of moderate-to-vigorous aerobic activity 5 days/week. Adiponectin and leptin levels were measured at baseline and after 12 months of intervention using a radioimmunoassay.
Adiponectin increased by 9.5 % in the diet group and 6.6 % in the diet+exercise group (both p≤0.0001 vs. control). Compared with controls, leptin decreased with all interventions (diet+exercise, −40.1%, p<0.0001; diet, −27.1%, p<0.0001; exercise, −12.7%, p=0.005). The results were not influenced by the baseline body mass index (BMI). The degree of weight loss was inversely associated with concentrations of adiponectin (diet, p-trend=0.0002; diet+exercise, p-trend=0.0005) and directly associated with leptin (diet, p-trend<0.0001; diet+exercise, p-trend<0.0001).
Weight loss through diet or diet+exercise increased adiponectin concentrations. Leptin concentrations decreased in all of the intervention groups, but the greatest reduction occurred with diet+exercise. Weight loss and exercise exerted some beneficial effects on chronic diseases via effects on adiponectin and leptin.
adiponectin; leptin; randomized controlled trial; diet and exercise intervention
BACKGROUND & AIMS
Individuals with Barrett’s esophagus (BE) have an increased risk of developing esophageal adenocarcinoma (EA). Obesity contributes to development of BE and its progression to cancer. We investigated the roles of obesity-induced hyperinsulinemia and dysregulation of adipokines in these processes.
We measured fasting levels of glucose, insulin, leptin, and adiponectin in 392 patients enrolled in the Seattle BE Study. We calculated homeostatic model assessment (HOMA) scores (a measure of insulin sensitivity) and identified subjects with metabolic syndrome. We evaluated the association between these measures and risk of EA using Cox regression models adjusted for known risk factors.
Increasing HOMA scores were associated with increasing risk for EA; the strongest association was observed within the first 3 years after participants entered the study (hazard ratio (HR)=2.45; 95% confidence interval [CI], 1.43–4.1; Ptrend=.001). Leptin level was also significantly associated with increased risk of EA within 3 y (HR=2.51; 95% CI 1.09–5.81; Ptrend =0.03) and 6 y (HR=2.07; 95% CI 1.01–4.26; Ptrend=0.048) of baseline. The level of high molecular weight adiponectin had a non-linear inverse association with risk of EA; the strongest associations were observed in the second tertile (HR=0.34; 95% CI, 0.14–0.82). Metabolic syndrome was not associated with risk of EA.
Among patients with BE, increased levels of leptin and insulin resistance are associated with increased risk for EA, whereas increased level of high molecular weight adiponectin is inversely associated with EA. These biomarkers might be used to determine cancer risk among patients with BE.
esophageal adenocarcinoma; Barrett’s esophagus; obesity; anthropometry; adipokines; leptin; adiponectin; HOMA; insulin sensitivity; metabolic syndrome; insulin resistance; esophageal cancer; overweight; body mass; cancer risk factor
High levels of insulin-like growth factor (IGF)-1 may increase the risk of common cancers in humans. We hypothesized that weight loss induced by diet and/or exercise would reduce IGF-1 in postmenopausal women. Four hundred and thirty nine overweight or obese (BMI ≥25kg/m2) women (50–75 y) were randomly assigned to: i) exercise (N=117), ii) dietary weight-loss (N=118), iii) diet + exercise (N=117), or iv) control (n=87). The diet intervention was a group-based program with a 10% weight loss goal. The exercise intervention was 45 min/day, 5 days/week of moderate-to-vigorous intensity activity. Fasting serum insulin-like growth factor (IGF)-1 and insulin-like growth factor binding protein (IGFBP)-3 were measured at baseline and 12 months by radioimmunoassay. Higher baseline BMI was associated with lower IGF-1 and IGF-1/IGFBP-3 molar ratio. While no significant changes in either IGF-1 or IGFBP-3 were detected in any intervention arm compared to control, the IGF-1/IGFBP-3 ratio increased significantly in the diet (+5.0%, p<0.01) and diet + exercise (+5.4%, p<0.01) groups compared to control. Greater weight loss was positively associated with change in both IGF-1 (ptrend=0.017) and IGF-1/IGFBP-3 ratio (ptrend<0.001) in the diet group, but inversely with change in IGFBP-3 in the diet + exercise group (ptrend=0.01). No consistent interaction effects with baseline BMI were detected. Modified IGF-1 bioavailability is unlikely to be a mechanism through which caloric restriction reduces cancer risk in postmenopausal women.
lifestyle; intervention; obesity; energy balance; insulin
Maintaining weight is important for better prognosis of breast cancer survivors. The associations between weight and cancer-related symptoms are not known. We examined associations among weight, weight change, inflammation, cancer-related symptoms, and health-related quality of life (HRQOL) in a cohort of stage 0-IIIA breast cancer survivors. Participants were recruited on average 6 months (2–12 months) after diagnosis. Height, weight, and c-reactive protein (CRP) were assessed at approximately 30 months post-diagnosis; cancer-related symptoms (chest wall and arm symptoms, vasomotor symptoms, urinary incontinence, vaginal symptoms, cognition/mood problems, sleep, sexual interest/function), and HRQOL (SF-36) were assessed at approximately 40 months post-diagnosis. Weight was measured at baseline in a subset. Data on 661 participants were evaluable for body mass index (BMI); 483 were evaluable for weight change. We assessed associations between BMI (<25.0, 25.0–29.9, ≥30.0 kg/m2), post-diagnosis weight change (lost ≥5%, weight change <5%, gained ≥5%), and CRP (tertile) with cancer-related symptoms and HRQOL using analysis of covariance (ANCOVA). Higher symptoms scores indicate more frequent or severe symptoms. Higher HRQOL scores indicate better HRQOL. Compared with those with BMI<25kg/m2, women with BMI ≥30 kg/m2 had scores that were: increased for arm symptoms (+25.0%), urinary incontinence (+40.0%), tendency to nap (+18.9%) and poorer physical functioning (−15.6%, all p<0.05). Obese women had lower scores in trouble falling asleep (−9.9%; p<0.05). Compared with weight change <5%, participants with ≥5% weight gain had lower scores in physical functioning (−7.2%), role-physical (−15.5%) and vitality (−11.2%), and those with weight loss ≥5% had lower chest wall (−33.0%) and arm symptom scores (−35.5%, all p<0.05). Increasing CRP tertile was associated with worse scores for chest wall symptoms, urinary incontinence, physical functioning, role-physical, vitality and physical component summary scores (all Ptrend<0.05). Future studies should examine whether interventions to maintain a healthy weight and reduce inflammation could alleviate cancer-related symptoms and improve HRQOL.
Breast cancer survivors; body weight; inflammation; cancer-related symptoms; quality of life
Physical activity is associated with reduced mortality and higher quality of life in breast cancer survivors; however, limited data on the prevalence of activity and long-term trends after diagnosis are available.
A multi-ethnic cohort of 631 women (18–64 years) with stage 0-IIIA breast cancer were followed for 10 years. Recreational aerobic activity (MET-hrs/week) was ascertained for the year before diagnosis (baseline), 24 months, 5 and 10 years after enrollment. Women were classified according to U.S. physical activity guidelines (≥150 mins/week moderate or ≥75 mins/week vigorous activity). The odds ratios (OR) for meeting guidelines at 5 and 10 years according to baseline factors was estimated using logistic regression. The change in MET-hrs/wk was predicted using linear regression.
Pre-diagnosis, 34% of women met physical activity guidelines; 34.0%, 39.5%, and 21.4% met guidelines at 24 months, 5 years, and 10 years post-enrollment, respectively. Fewer than 8% of survivors met guidelines at all follow-up periods. Over 10 years, recreational aerobic activity decreased by a mean(SD) 4.3(16.2) MET-hrs/wk.. Meeting guidelines pre-diagnosis was strongly associated with meeting guidelines at 5 years [OR (95% CI): 2.76 (1.85–4.1)] and 10 years [OR (95% CI): 3.35 (2.13–5.28)]. No other demographic or prognostic factors were significantly associated with the 10-year change in MET-hrs/wk.
The vast majority of early breast cancer survivors do not meet national exercise recommendations 10 years post-diagnosis.
Physical activity levels are low in breast cancer survivors across the 10 years post-diagnosis, yet the predictors of activity in this population remain poorly understood.
exercise; women; cancer survivorship; lifestyle
Investigate the effects of 12 months of dietary weight loss and/or aerobic exercise on leukocyte telomere length in postmenopausal women.
Design and Methods
439 overweight or obese women (50–75 y) were randomized to: i) dietary weight loss (N=118); ii) aerobic exercise (N=117), iii) diet + exercise (N=117), or iv) control (N=87). The diet intervention was a group-based program with a 10% weight loss goal. The exercise intervention was 45 mins/day, 5 days/week of moderate-to-vigorous aerobic activity. Fasting blood samples were taken at baseline and 12 months. DNA was extracted from isolated leukocytes and telomere length was measured by quantitative-polymerase chain reaction (qPCR). Mean changes were compared between groups (intent-to-treat) using generalized estimating equations.
Baseline telomere length was inversely associated with age (r=−0.12 p<0.01) and positively associated with maximal oxygen uptake (r=0.11, p=0.03), but not with BMI or %body fat. Change in telomere length was inversely correlated with baseline telomere length (r=−0.47, p<0.0001). No significant difference in leukocyte telomere length was detected in any intervention group compared to controls, nor was the magnitude of weight loss associated with telomere length at 12 months.
Twelve-months of dietary weight loss and exercise did not change telomere length in postmenopausal women.
caloric restriction; physical activity; lifestyle; ageing; chromosomes
To investigate the effects of 12 months of dietary weight loss and/or aerobic exercise on lean mass and the measurements defining sarcopenia in postmenopausal women, and to examine the potential moderating effect of serum 25-hydroxyvitamin D (25(OH)D) and age.
439 overweight and obese postmenopausal women were randomized to: diet modification (N=118); exercise (N=117), diet+exercise (N=117), or control (N=87). The diet intervention was a group-based program with a 10% weight loss goal. The exercise intervention was 45 mins/day, 5 days/week of moderate-to-vigorous intensity aerobic activity. Total and appendicular lean mass were quantified by dual Xray absorptiometry (DXA) at baseline and 12 months. A skeletal muscle index (SMI=appendicular lean mass (kg)/m2) and the prevalence of sarcopenia (SMI<5.67 kg/m2) were calculated. Serum 25(OH)D was assayed using a competitive chemiluminescent immunoassay.
Dietary weight loss resulted in a significant decrease in lean mass, and a borderline significant decrease in appendicular lean mass and SMI compared to controls. In contrast, aerobic exercise significantly preserved appendicular lean mass and SMI. Diet + exercise attenuated the loss of appendicular lean mass and SMI compared to diet alone, and did not result in significant loss of total- or appendicular lean mass compared to controls. Neither serum 25(OH)D nor age were significant moderators of the intervention effects.
Aerobic exercise added to dietary weight loss can attenuate the loss of appendicular lean mass during weight loss, and may be effective for the prevention and treatment of sarcopenia among overweight and obese postmenopausal women.
caloric restriction; weight loss; 25-hydroxyvitamin D; ageing
The risk of musculoskeletal injury with the introduction of moderate-to-vigorous exercise in sedentary adults is not well established. The purpose of this report is to examine the effect of a 12-month exercise intervention on musculoskeletal injury and bodily pain in predominately overweight, sedentary, men (n=102) and women (n=100), aged 40–75 years.
Participants were randomized to a moderate-to-vigorous aerobic exercise intervention (EX) (6 d/wk, 60 min/d, 60–85% max. heart rate) or usual lifestyle control (CON). Participants completed a self-report of musculoskeletal injury and body pain at baseline and 12-months.
The number of individuals reporting an injury (CON; 27% vs. EX; 28%, p= .95) did not differ by group. The most commonly injured site was lower leg/ankle/foot. The most common causes of injury were sports/physical activity, home maintenance or “other”. In the control group, bodily pain increased over the 12 months compared to the exercise group (CON −7.9, EX −1.4, p=.05). Baseline demographics and volume of exercise were not associated with injury risk.
Previously sedentary men and women randomized to a 12-month aerobic exercise intervention with a goal of 360 min/wk reported the same number of injuries as those in the control group and less bodily pain.
musculoskeletal; physical activity; bodily pain; overweight
Adipose tissue plays a role in obesity-related cancers via increased production of inflammatory factors, steroid hormones, and altered adipokines. The impact of weight loss on adipose-tissue gene expression may provide insights into pathways linking obesity with cancer risk. We conducted an ancillary study within a randomized trial of diet, exercise, or combined diet+exercise vs. control among overweight/obese postmenopausal women. In 45 women, subcutaneous adipose-tissue biopsies were performed at baseline and after 6 months and changes in adipose-tissue gene expression were determined by microarray with an emphasis on pre-specified candidate pathways, as well as by unsupervised clustering of >37,000 transcripts (Illumina). Analyses were conducted first by randomization group, and then by degree of weight change at 6-months in all women combined. At 6 months, diet, exercise and diet+exercise participants lost a mean of 8.8 kg, 2.5 kg, and 7.9 kg (all p<0.05 vs. no change in controls). There was no significant change in candidate-gene expression by intervention group. In analysis by weight-change category, greater weight loss was associated a decrease in 17β-hydroxysteroid dehydrogenase-1 (HSD17B1, p-trend<0.01) and leptin (LEP, p-trend<0.01) expression, and marginally significant increased expression of estrogen receptor-1 (ESR1, p-trend=0.08) and insulin-like growth factor binding protein-3 (IGFBP3, p-trend=0.08). Unsupervised clustering revealed 83 transcripts with statistically significant changes. Multiple gene-expression changes correlated with changes in associated serum biomarkers. Weight-loss was associated with changes in adipose-tissue gene expression after 6 months, particularly in two pathways postulated to link obesity and cancer, i.e., steroid-hormone metabolism and IGF signaling.
Adiposity; gene expression; obesity; weight-loss; exercise; diet; leptin; sex hormones; inflammation; adipokines; human; randomized-controlled trial
Elevated circulating insulin-like growth factor-1 (IGF-1), a breast epithelial cell mitogen, is associated with breast cancer development. However, its association with breast cancer survival is not established. Circulating concentrations of IGF-1 are controlled via binding proteins, including IGF Binding Protein-3 (IGFBP-3), that may modulate the association of IGF1 with breast-cancer outcomes.
We measured IGF-1 and IGFBP-3 concentrations in serum from 600 women enrolled in the Health, Eating, Activity, and Lifestyle (HEAL) Study, a multiethnic, prospective cohort study of women diagnosed with stage I-IIIA breast cancer. We evaluated the association between IGF-1 and IGFBP-3, and as a ratio, modeled using quintile cut-points, with risk of breast cancer-specific (n=42 deaths) and all-cause mortality (n=87 deaths) using Cox proportional hazards models. In models adjusted for body mass index, ethnicity, tamoxifen use at time of blood draw, treatment received at diagnosis, and IGFBP-3, women in the highest quintile of IGF-1 level had an increased risk of all-cause mortality (Hazard Ratio (HR)=3.10 95% CI 1.21-7.93, p=0.02), although no dose-response association was evident. The IGF-1/IGFBP-3 ratio, an indicator of free IGF-I levels, was significantly associated with increasing risk of all-cause mortality (HR=2.83 95% CI 1.25-6.36 Ptrend=0.01, upper vs. lower quintile) in a fully adjusted model.
In conclusion, high serum levels of IGF-1 and the IGF-1/IGFBP-3 ratio were associated with increased risk of all-cause mortality in women with breast cancer. These results need to be confirmed in larger breast cancer survivor cohorts.
IGF-1; IGFBP-3; breast cancer survival; mortality
Regular exercise increases exercise self-efficacy and health-related quality of life (HRQOL); however, the mechanisms are unknown. We examined the associations of exercise adherence and physiological improvements with changes in exercise self-efficacy and HRQOL.
Middle-aged adults (N=202) were randomized to 12 months aerobic exercise (360 minutes/week) or control. Weight, waist circumference, percent body fat, cardiopulmonary fitness, HRQOL (SF-36), and exercise self-efficacy were assessed at baseline and 12 months. Adherence was measured in minutes/day from activity logs.
Exercise adherence was associated with reduced bodily pain, improved general health and vitality, and reduced role-emotional scores (Ptrend≤0.05). Increased fitness was associated with improved physical functioning, bodily pain and general health scores (Ptrend≤0.04). Reduced weight and percent body fat were associated with improved physical functioning, general health, and bodily pain scores (Ptrend<0.05). Decreased waist circumference was associated with improved bodily pain and general health but with reduced role-emotional scores (Ptrend≤0.05). High exercise adherence, increased cardiopulmonary fitness and reduced weight, waist circumference and percent body fat were associated with increased exercise self-efficacy (Ptrend<0.02).
Monitoring adherence and tailoring exercise programs to induce changes in cardiopulmonary fitness and body composition may lead to greater improvements in HRQOL and self-efficacy that could promote exercise maintenance.
physical activity; intervention study; aerobic; physical fitness