title: Decreased p21 expression in HPV-18 positive cervical carcinomas.
abstract: The aim of this study was to investigate the relationship between different human papillomavirus (HPV) genotypes and the expression of p53, p21 and p27 in cervical carcinomas. A total of 103 cases of cervical carcinomas were assayed for expression of p53, p21 and p27 by immunohistochemistry. HPV typing was carried out by two polymerase chain reaction-based methods. Overall, HPV prevalence was 97.1% among the cervical carcinomas in this study. HPV-16 was detected in 66% of the tumors, HPV-18 in 7.8%, HPV-16/18 in 7.8% and other HPV types in 15.5%. The expression of p53 and p27 was not related to HPV genotype. However, in the HPV-18 positive cervical carcinomas, expression of p21 was significantly decreased or completely absent (P = 0.019). Our results indicated that down-regulation of p21 was strongly associated with HPV-18 positive cervical carcinomas. The significantly lower expression of p21 protein in HPV-18 positive samples compared to HPV-18 negative cervical carcinomas supports the hypothesis that inactivation and degradation of p21 proteins by HPV-18 E7 may play an important role in the carcinogenesis of HPV-18 positive cervical neoplasia.
authors: Department of Obstetrics and Gynecology, Shin Kong Wu Ho-Su Memorial Hospital, 95 Wen Chang Road, Shih-Lin District, Taipei, 111, Taiwan. m002057@ms.skh.org.tw
authors: Lee-Wen
authors: LW
authors: Huang
authors: Kok-Min
authors: KM
authors: Seow
authors: Chin-Cheng
authors: CC
authors: Lee
authors: Yu-Hung
authors: YH
authors: Lin
authors: Hun-Shan
authors: HS
authors: Pan
authors: Heng-Ju
authors: HJ
authors: Chen
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D050759:Cyclin-Dependent Kinase Inhibitor p21 / Q000096:biosynthesis* / Q000235:genetics; D005260:Female; D052162:Human papillomavirus 16 / Q000235:genetics; D052161:Human papillomavirus 18 / Q000235:genetics; D006801:Humans; D007150:Immunohistochemistry; D008875:Middle Aged; D030361:Papillomavirus Infections / Q000150:complications* / Q000453:epidemiology / Q000235:genetics; D015995:Prevalence; D018809:Proliferating Cell Nuclear Antigen / Q000096:biosynthesis; D016159:Tumor Suppressor Protein p53 / Q000096:biosynthesis; D002583:Uterine Cervical Neoplasms / Q000235:genetics / Q000378:metabolism* / Q000821:virology*
chemical_list: D050759:Cyclin-Dependent Kinase Inhibitor p21; D018809:Proliferating Cell Nuclear Antigen; D016159:Tumor Suppressor Protein p53; C413374:p27 antigen