Tumour suppressor gene methylation and cervical cell folate concentration are determinants of high-risk human papillomavirus persistence: a nested case control study

• Published in: BMC cancer 2014-11, Vol.14 (1), p.803-803, Article 803
• Main Authors: Flatley, Janet E, Sargent, Alexandra, Kitchener, Henry C, Russell, Jean M, Powers, Hilary J
• Format: Article
• Language: English
• Subjects: Adult; Case-Control Studies; Cervical cancer; Cervical Intraepithelial Neoplasia - etiology; Cervix Uteri - metabolism; Cervix Uteri - pathology; Cervix Uteri - virology; DNA Methylation; Female; Folic Acid - metabolism; Genes, Tumor Suppressor; Human papillomavirus; Humans; Kinases; Medical research; Papillomaviridae; Papillomavirus Infections - complications; Papillomavirus Infections - epidemiology; Papillomavirus Infections - genetics; Papillomavirus Infections - metabolism; Papillomavirus Infections - virology; Prevalence; Studies; Uterine Cervical Neoplasms - etiology; Womens health; Young Adult
• ISSN: 1471-2407; 1471-2407
• DOI: 10.1186/1471-2407-14-803

Persistent infection with one or more high-risk human papillomavirus [HR-HPV] types increases the risk of intraepithelial neoplasia and cervical cancer. A nested case-control study was conducted to investigate the importance of cervical cell folate concentration and tumour suppressor gene methylation as risk factors for HR-HPV persistence. Cervical cell samples from 955 women with HR-HPV infection and normal, borderline or mild dyskaryosis were retrieved from the archive of a population-based screening trial. Women were classified as cases or controls, reflecting the presence or absence [respectively] of any HR-HPV infection at a follow-up clinic at least 6 months from baseline. Cervical cell folate concentration and promoter methylation of five tumour suppressor genes were measured in independent samples from cases and controls. A higher cervical cell folate concentration [P = 0.015] was an independent predictor of infection at follow-up, together with infection with HPV-16 or infection with multiple HR-HPV types. Methylation of the tumour suppressor gene DAPK was associated with a 2.64-fold [95% CI, 1.35-5.17] increased likelihood of HPV infection whilst CDH1 methylation was associated with a 0.53-fold [95% CI, 0.331-0.844] likelihood of HR-HPV infection at follow-up. When considering women with normal or abnormal cytology, the predictive effect of higher cervical cell folate was only seen in women with mild cytology [P = 0.021]; similarly the effect of DAPK methylation was seen in women with mild or borderline cytology [P < 0.05]. Higher cervical cell folate concentration and promoter methylation of the tumour suppressor gene, DAPK, in women with cervical cell dyskaryosis, are associated with increased risk of HR-HPV persistence.