Prolyl hydroxylation is a post-translational modification that affects the structure,
stability and function of proteins including collagen by catalysing hydroxylation of
proline to hydroxyproline through action of collagen prolyl hydroxylases3 (C-P3H) and 4
(C-P4H). Three C-P3Hs (nomenclature was amended according to approval by the HGNC
symbols and names at (http://www.genenames.org) and Entrez database at (http://www.ncbi.nlm.nih.gov/gene)
leucineproline-enriched proteoglycan (leprecan) 1 (Lepre1), leprecan-like 1
(Leprel1), leprecan-like 2 (Leprel2) and two paralogs
Cartilage-Related Protein (CRTAP) and leprecan-like 4 (Leprel4) are
found in humans. The C-P4Hs are tetrameric proteins comprising a variable
α subunit, encoded by the P4HA1, P4HA2 and
P4HA3 genes and a constant β subunit encoded by
We used RT–PCR, qPCR, pyrosequencing, methylation-specific PCR, western blotting
and immunohistochemistry to investigate expression and regulation of the C-P3H
and C-P4H genes in B lymphomas and normal bone marrow.
C-P3H and C-P4H are downregulated in lymphoma. Down-regulation is associated with
methylation in the CpG islands and is detected in almost all common types of B-cell
lymphoma, but the CpG islands are unmethylated or methylated at lower levels in DNA
isolated from normal bone marrow and lymphoblastoid cell lines. Methylation of multiple
C-P3H and C-P4H genes is present in some lymphomas, particularly
Methylation of C-P3H and C-P4H is common in B lymphomas and may have
utility in differentiating disease subtypes.
non-Hodgkin lymphoma; Prolyl hydroxylases; methylation; epigenetics
The mitogen-activated protein kinase (MAPK) phosphatases or dual specificity phosphatases (DUSPs) are a family of proteins that catalyse the inactivation of MAPK in eukaryotic cells. Little is known of the expression, regulation or function of the DUSPs in human neoplasia.
We used RT–PCR and quantitative PCR (qPCR) to examine the expression of DUSP16 mRNA. The methylation in the DUSP16 CpG island was analysed using bisulphite sequencing and methylation-specific PCR. The activation of MAPK was determined using western blotting with phospho-specific antibodies for extra-cellular signal-related kinase (ERK), p38 and c-Jun N-terminal kinase (JNK). The proliferation of cell lines was assessed using the CellTiter 96 Aqueous One assay.
The expression of DUSP16, which inactivates MAPK, is subject to methylation-dependent transcriptional silencing in Burkitt's Lymphoma (BL) cell lines and in primary BL. The silencing is associated with aberrant methylation in the CpG island in the 5′ regulatory sequences of the gene blocking its constitutive expression. In contrast to BL, the CpG island of DUSP16 is unmethylated in other non-Hodgkin's lymphomas (NHLs) and epithelial malignancies. In BL cell lines, neither constitutive nor inducible ERK or p38 activity varied significantly with DUSP16 status. However, activation of JNK was increased in lines with DUSP16 methylation. Furthermore, methylation in the DUSP16 CpG island blocked transcriptional induction of DUSP16, thereby abrogating a normal physiological negative feedback loop that limits JNK activity, and conferred increased cellular sensitivity to agents, such as sorbitol and anthracycline chemotherapeutic agents that activate JNK.
DUSP16 is a new epigenetically regulated determinant of JNK activation in BL.
DUSP; Epigenetics; HIV; Burkitt's lymphoma
The paternal origins of Thoroughbred racehorses trace back to a handful of Middle Eastern stallions, imported to the British Isles during the seventeenth century. Yet, few details of the foundation mares were recorded, in many cases not even their names (several different maternal lineages trace back to ‘A Royal Mare’). This has fuelled intense speculation over their origins. We examined mitochondrial DNA from 1929 horses to determine the origin of Thoroughbred foundation mares. There is no evidence to support exclusive Arab maternal origins as some historical records have suggested, or a significant importation of Oriental mares (the term used in historic records to refer to Middle East and western Asian breeds including Arab, Akhal-Teke, Barb and Caspian). Instead, we show that Thoroughbred foundation mares had a cosmopolitan European heritage with a far greater contribution from British and Irish Native mares than previously recognized.
Thoroughbred horse; foundation of breed; maternal origins; phylogenetics; mitochondrial DNA
Atazanavir, an azadipeptide protease inhibitor (PI) with once daily dosing, a lack of insulin resistance, lipid increase, and gastrointestinal toxicities, is approved in combination with other antiretrovirals for the treatment of patients infected with HIV. Unboosted atazanavir is also used in highly active antiretroviral therapy (HAART) naive patients.
The study prospectively followed up an established cohort of patients who received atazanavir, and for whom one year of follow up data were available.
It was found that use of atazanavir in intent to treat and on treatment analyses, maintained and led to virological suppression and increases in CD4 count in both PI naive and experienced patients. Virological failure occurred in 7% of patients and the main toxicity was hyperbilirubinaemia, which led to treatment withdrawal in 2%. Its efficacy and safety profile was similar to that seen in previous randomised studies investigating its use.
These data should provide reassurance for clinicians wishing to introduce a new antiretroviral into an established cohort.
HIV; AIDS; compliance; atazanavir; lipid
Background: The CD4 count is a dominant prognostic and predictive factor in HIV infection. This study assessed the utility of the total lymphocyte count (TLC) in place of the CD4 count to predict the development of AIDS defining opportunistic infections (ADOI).
Methods: The Chelsea and Westminster cohort was used to identify those people with a first episode of an ADOI. Corresponding CD4 and TLCs were recorded before diagnosis or at the time of first prescribing prophylaxis; patients without an AIDS defining opportunistic infection were defined as being at "risk" and receiver operating characteristic (ROC) curves were used to display the results of sensitivity and the false positive error rate of total lymphocyte and CD4 count groups.
Results: A significant linear correlation was seen between the log10 CD4 count and log10 TLC (Pearson's correlation coefficient = 0.70, p<0.001). The finer cut off value for TLC where false positive error rate is minimum and sensitivity maximum was 1500–2000 cells/mm3. Patients with TLC 1000–1500 cells/mm3 were estimated to be at 40% increased risk of developing an ADOI. The cut off value for CD4 counts measured 200 cells/mm3 above which the risk developing an ADOI decreased. Patients with a CD4 count of 150–200 cells/mm3 were at a 34% increased risk of developing an ADOI. The area under the ROC curve for TLC was 10% lower than that for CD4 count.
Conclusions: The TLC is minimally less reliable than the CD4 count as a predictor of ADOIs. In the absence of expensive equipment for CD4 measurement, the TLC is a useful test.
Background: Previous studies have reached differing conclusions about the utility of anal cytology as a screening tool for anal intraepithelial neoplasia (AIN). There is a need also to establish whether HPV typing offers a useful adjunct to screening.
Methods: We analysed data from 99 consecutive homosexual/bisexual male patients (89 HIV-1 positive) who underwent high resolution anoscopy. Follow up visits for these patients were also included, giving a total of 160 anoscopic procedures. Comparison was made between results of anal cytology using the sampling method of Palefsky, and histological findings of biopsies taken from abnormal areas seen on high resolution anoscopic examination of the anal canal. Swabs taken concurrently with the cytology were analysed for the presence of human papillomavirus (HPV) DNA and compared with the cytological and histological findings.
Results: The sensitivity of the cytology was 83%, and the specificity 38% when compared with histology. At screening of 34 asymptomatic men, 83% had anal cytological dysplasia and 78% had AIN. There were no significant differences in the prevalence of hrHPV genotypes between different cytological or histological grades of abnormalities.
Conclusion: Anal cytology by the Palefsky method is simple to undertake, has a sensitivity and specificity comparable with cervical cytology, and can therefore be used as the basis of a pilot screening project in centres with large cohorts of HIV positive homosexual men who have a high risk of developing anal carcinoma. HPV genotyping is not a useful adjunct to cytological screening.
The majority of women requiring chemotherapy for gestational trophoblastic disease (GTN) are cured with their initial chemotherapy treatment. However, a small percentage either become refractory to treatment, or relapse after the completion of treatment. This study investigates the characteristics and outcome of these patients. Patients were identified from the Charing Cross Hospital GTD database. The outcome of these patients with relapsed disease was compared to those with refractory disease. Between 1980 and 2004, 1708 patients were treated with chemotherapy for GTN. Sixty (3.5%) patents relapsed following completion of initial therapy. The overall 5-year survival for patients with relapsed GTN was 93% (95% CI 86–100%). The overall survival for patients with low-risk and high-risk disease at presentation, who subsequently relapsed was 100% (n=35), and 84% (n=25) (95% CI: 66–96%: P<0.05), respectively. Eleven patients were identified who failed to enter remission and had refractory disease. These patients had a worse outcome compared to patients with relapsed disease (5-year survival 43% (95% CI:12–73% P<0.01)). The outcome of patients with relapsed GTN is good. However, patients with primary chemo-refractory disease do poorly and novel therapies are required for this group of patients.
gestational trophoblastic neoplasia; relapse; chemotherapy
Ocular involvement of systemic non-Hodgkin's lymphoma is rare. This report describes the unusual occurrence of a biopsy confirmed low grade lymphoma recurring in the conjunctiva, three years after initial diagnosis of systemic disease. The tumour was surgically resected and the patient remains disease free four years later. After the diagnosis of lymphoma, long term follow up is advised as recurrences in unusual sites can occur.
It is thought that the time interval between the antecedent pregnancy and diagnosis of gestational trophoblastic tumours (GTTs) may influence the outcome of these patients. In this study, we investigate the significance of this time interval. Multivariate analysis was used to investigate if the time interval was of prognostic significance from our cohort of 241 high-risk patients with GTT. Subsequent cutpoint analysis was used to determine an optimal cutpoint for the interval covariate. The outcome of these patients was plotted according to the Kaplan–Meier method. The time interval was of prognostic significance on multivariate analysis. A period of greater than 2.8 years after pregnancy was found to be of most significance. The 5-year overall survival was 62.0% (95% CI: 47–76%) for greater than 2.8 years vs 94% (95% CI: 91–97%) for less than 2.8 years (P<0.001). Multivariate analysis showed the presence of liver metastasis and the number of metastasis was also of prognostic importance. The interval between antecedent pregnancy and diagnosis in high-risk GTT is of prognostic significance. This gives some insight into the pathogenesis of the disease.
gestational trophoblastic disease; interval; survival
Kaposi's sarcoma (KS) is an AIDS-defining condition in individuals with human immunodeficiency virus type 1 infection. We investigated the phenotype and function of the NKG2C+ NK cell population in individuals with AIDS and Kaposi's sarcoma. The staging of AIDS KS patients according to the AIDS Clinical Trial Group criteria revealed that patients with the S1 disease stage have a significantly higher proportion of NKG2C+ cells than those with the S0 disease stage. NKG2C+ cells from S1-stage patients are highly enriched for the expression of KIR3DL1, are depleted of NKp46, and respond poorly to major histocompatibility complex class I-positive target cells. These data demonstrate a link between NK cell phenotype and function and disease prognosis in AIDS.
Background: Research is an increasingly important aspect of higher medical training for many doctors. Studies investigating sources of stress, isolation, and workplace bullying have not previously sought information in this setting.
Methods: An internet based questionnaire survey of doctors undertaking research (n = 259) was conducted to examine stressors and levels of job satisfaction in this potentially vulnerable group. In order to assess overall levels of satisfaction, we asked whether doctors would recommend their research post to a colleague.
Results: There was a statistically significant association between those who would not recommend their post to a colleague and those who had difficulties in arranging funding and in writing up (p<0.001). Further significant correlations were found between dissatisfaction with the post and lack of help, support, and advice from supervisors and colleagues, wanting to change supervisors, experience of the major categories of workplace bullying, and having an inadequate clinical commitment (p<0.001). When the significant variables were entered into a multivariate analysis, the results showed that dissatisfaction was associated with wanting to change supervisors and with a threat to professional status.
Conclusions: Stress and bullying are common in doctors undertaking research. These findings have important implications for medical training and for doctors choosing research projects. Setting up systems of support may have important benefits.
Antibiotic resistance profiles are useful in directing therapeutic strategies during bacterial infections. Patterns of antimicrobial resistance in Streptococcus pneumoniae and Pseudomonas aeruginosa associated pneumonia were investigated in an HIV-1 infected cohort during the era of highly active antiretroviral therapy. The median CD4 count at presentation was significantly lower for cases of P aeruginosa than for S pneumoniae. However, the number of antibiotic resistant cases of P aeruginosa decreased throughout the study period, while the incidence of S pneumoniae remained unchanged. In contrast to pneumococcal pneumonia, we show that antiretrovirals have protected from pneumonia due to antibiotic resistant P aeruginosa. These findings have implications for the treatment of individuals presenting with serious infections in which antibiotic therapy needs to be instituted before identification and sensitivities are known.
Pneumocystis carinii pneumonia (PCP) remains a serious opportunistic infection in HIV infected individuals. Seasonal changes in climate are associated with changes within individual susceptibility to infection. The possibility of monthly variability in the incidence of PCP was therefore examined by means of a cohort study of a database of 8640 HIV infected individuals attending the Chelsea and Westminster Hospital. There were 792 cases of PCP diagnosed since 1985. A marked decline was observed in the incidence of PCP in mid-1992 coincident with the introduction of PCP prophylaxis. There was a further decline in 1996 after the introduction of highly active antiretroviral therapy. Despite no significant monthly variation in the mean attendance to clinic and CD4 count, both new and all cases of PCP were higher in January than in other months (15.9% and 14.5% of all cases, respectively). A correlation with low rainfall in January and new cases of PCP was observed. These data are consistent with an influence of climatic conditions on the presentation of PCP. The diagnosis of PCP is more common in winter months suggesting that this is a transmissible infection.
HIV; testicular cancer; germ cell tumour; HAART; survival
Objective: To review the current literature on HIV associated anal intraepithelial neoplasia (AIN).
Methods: A comprehensive Medline/Pubmed search was performed for the years 1980–2001 (January) for articles pertaining to HIV associated anal intraepithelial neoplasia. From the MeSH terms "anal intraepithelial neoplasia" and "anal cancer" the following subheadings were used: HIV, homosexual men, HPV, Epidemiology, Etiology, Mortality, Diagnosis, Screening, Drug Therapy, Surgical Therapy, Radio Therapy, Risk factors, ASIL. The search was limited to "human" for all searches. In the absence of enough "randomised controlled trials" the search was extended to clinical trials, reviews, and case reports. One analysis on cost effectiveness and two abstracts presented at 12th World AIDS Conference and 6th Conference on Retrovirus and Opportunistic Infections were included. The 44 publications referred to originate from the United Kingdom (9), the United States (26), and Denmark (5), with one each from Switzerland, Germany, Australia, and France. The Cochrane Database of systematic reviews yielded 11 complete reviews for "anal cancer" and none for "anal intraepithelial neoplasia." The textbook of AIDS-related cancers and their treatment was consulted. We also included our personal experience from the treatment of patients at the Chelsea and Westminster Hospital, one of the largest centres for the management of HIV disease in Europe.
Conclusion: Routine anal cytological screening followed by appropriate management of AIN is an important issue for HIV infected patients. The natural history of AIN has not been fully established and this prevents clinicians from defining clear management protocols. There is early evidence that the benefits of highly active antiretroviral therapy (HAART) in terms of restoring immune function and reducing opportunistic infections and some neoplasms may not extend to regression of AIN. Under these circumstances it might be predicted that AIN and subsequent progression to invasive anal cancer would rise as HAART prolongs the lives of seropositive people. However, routine anal cytological screening will surely have to await an effective proved intervention for AIN and this would seem to be a pressing clinical goal. Sex Transm Inf (Sex Transm Inf 2001;77:327–331)
Key Words: anal intraepithelial neoplasia; HIV; human papillomavirus
HIV; non-small-cell lung cancer; HAART
Objective: To review the current literature on HIV associated non-Hodgkin's lymphoma.
Methods: A comprehensive Medline/Pubmed search of articles pertaining to HIV associated non-Hodgkin's lymphoma as well as personal experience from the treatment of over 200 patients at the Chelsea and Westminster Hospital, one of the largest centres for the management of HIV disease in Europe.
Conclusion: High grade B cell non-Hodgkin's lymphoma is the second commonest tumour affecting people with HIV. The incidence of this tumour is not declining following the introduction of highly active antiretroviral therapy. Chemotherapy has been employed with modest success in this group of patients; however, the prognosis remains worse than for immunocompetent patients. Advances in molecular genetics and virology have led to a greater understanding of the biology of these tumours. However, these advances have yet to be translated into improvements in the clinical management of patients with AIDS associated non-Hodgkin's lymphoma.
Key Words: AIDS; HIV; non-Hodgkin's lymphoma
Radical retropubic prostatectomy is considered by many centres to be the treatment of choice for men aged less than 70 years with localized prostate cancer. A rise in serum prostate-specific antigen after radical prostatectomy occurs in 10–40% of cases. This study evaluates the usefulness of novel ultrasensitive PSA assays in the early detection of biochemical relapse. 200 patients of mean age 61.2 years underwent radical retropubic prostatectomy. Levels ≤ 0.01 ng ml–1 were considered undetectable. Mean pre-operative prostate-specific antigen was 13.3 ng ml–1. Biochemical relapse was defined as 3 consecutive rises. The 2-year biochemical disease-free survival for the 134 patients with evaluable prostate-specific antigen nadir data was 61.1% (95% CI: 51.6–70.6%). Only 2 patients with an undetectable prostate-specific antigen after radical retropubic prostatectomy biochemically relapsed (3%), compared to 47 relapses out of 61 patients (75%) who did not reach this level. Cox multivariate analysis confirms prostate-specific antigen nadir ≤ 0.01 ng ml–1 to be a superb independent variable predicting a favourable biochemical disease-free survival (P < 0.0001). Early diagnosis of biochemical relapse is feasible with sensitive prostate-specific antigen assays. These assays more accurately measure the prostate-specific antigen nadir, which is an excellent predictor of biochemical disease-free survival. Thus, sensitive prostate-specific antigen assays offer accurate prognostic information and expedite decision-making regarding the use of salvage prostate-bed radiotherapy or hormone therapy. © 2000 Cancer Research Campaign http://www.bjcancer.com
prostate cancer; PSA nadir; radical retropubic prostatectomy
Loss of heterozygosity (LOH) for chromosome 10 is the most frequent genetic abnormality observed in high-grade gliomas. We have used fluorescent microsatellite markers to examine a series of 83 patients, 34 with anaplastic astrocytoma (grade 3) and 49 with glioblastoma multiforme (grade 4), for LOH of chromosome 10. Genotype analysis revealed LOH for all informative chromosome 10 markers in 12 (35%) of patients with grade 3 and 29 (59%) grade 4 tumours respectively, while partial LOH was found in a further eight (24%) grade 3 and ten (20%) grade 4 tumours. Partial LOH, was confined to the long arm (10q) in six and the short arm (10p) in three cases, while alleles from both arms were lost in four cases. Five tumours (one grade 3 and four grade 4) showed heterogeneity with respect to loss at different loci. There was a correlation between any chromosome 10 loss and poorer performance status at presentation (χ2P = 0.005) and with increasing age at diagnosis (Mann–Whitney U-test P = 0.034) but not with tumour grade (χ2P = 0.051). A Cox multivariate model for survival duration identified age (proportional hazards (PH), P = 0.004), grade (PH, P = 0.012) and any loss of chromosome 10 (PH, P = 0.009) as the only independent prognostic variables. Specifically, LOH for chromosome 10 was able to identify a subgroup of patients with grade 3 tumours who had a significantly shorter survival time. We conclude that LOH for chromosome 10 is an independent, adverse prognostic variable in high-grade glioma. © 1999 Cancer Research Campaign
glioma; brain tumour; loss of heterozygosity; microsatellite
One hundred and sixteen patients with locally advanced or metastatic breast cancer were randomized to receive CMF (cyclophosphamide 600 mg m−2 day 1 and 8 i.v., 5-fluorouracil 600 mg m−2 day 1 and 8 i.v.,, methotrexate 40 mg m−2 day 1 and 8 i.v., monthly for 6 cycles) or MM (methotrexate 30 mg m−2, mitoxantrone 6.5 mg m−2, both i.v. day 1 3-weekly for 8 cycles) as first line treatment with chemotherapy. Objective responses occurred in 17 patients out of 58 (29%) who received CMF and nine out of 58 (15%) who received MM; 95% confidence interval for difference in response rates (–1%–29%), P = 0.07. No statistically significant differences were seen in overall survival or time to progression between the two regimes although a tendency towards a shorter progression time on the MM regime must be acknowledged. There was, however, significantly reduced haematological toxicity (P < 0.001) and alopecia (P < 0.001) and fewer dose reductions and delays in patients randomized to MM. No statistically significant differences were seen between the two regimes in terms of quality of life (QOL). However, some association between QOL and toxicity was apparent overall with pooled QOL estimates tending to indicate a worsening in psychological state with increasing maximum toxicity over treatment. Despite the fact that results surrounding response rates and time to progression did not reach statistical significance, their possible compatibility with an improved outcome on CMF treatment must be borne in mind. However, MM is a well-tolerated regimen with fewer side-effects than CMF, which with careful patient management and follow-up, therefore, may merit consideration as a first-line treatment to palliate patients with metastatic breast cancer who are infirm or elderly. © 1999 Cancer Research Campaign
breast cancer; chemotherapy; metastases; mitoxantrone; methotrexate
Thirty-one consecutive patients with relapsed or refractory GCT received an HDT schedule including carboplatin, the dose of which was adjusted to measured glomerular filtration rate. There was one HDT-associated death (3%), due to acute renal failure. The 3-year probability of overall and disease-free survival for 21 patients with primary refractory disease or responsive relapse was 60% and 42%, respectively, while none of ten patients with refractory relapse have survived disease free.
We report the development of severe life threatening polymorphic ventricular tachycardia in a young woman shortly following her first pregnancy, who ultimately required the insertion of an automatic implantable cardioverter/defibrillator because of the failure of conventional antiarrhythmic therapy. Although only about 7 patients have received units in the UK to date, the experience in the USA, where up to 300 per month may be implanted, suggests that they will become a more common method of treatment in cases of life threatening arrhythmias.