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The p53 Arg72Pro Polymorphism, Human Papillomavirus, and Invasive Squamous Cell Cervical Cancer¹

Programs in Epidemiology [M. M. M., S. M. S., J. R. D.], and Cancer Biology, [K. S., D. A. G., G. C. W., J. J. C., J. K. M.], Fred Hutchinson Cancer Research Center, Seattle, Washington 98109-1024; Departments of Epidemiology [S. M. S., J. R. D.] and Biostatistics, [B. M.], School of Public Health and Community Medicine, University of Washington, Seattle, Washington 98195; and Departments of Microbiology [D. A. G.], and Pathology, [J. K. M.], School of Medicine, University of Washington, Seattle, Washington 98195

A. Storey et al. [Nature (Lond.), 393: 229–234, 1998)] reported a 7-fold increased risk of cervical cancer associated with having an Arg/Arg polymorphism at codon 72 of p53 compared with the Pro/Arg heterozygotes (odds ratio, 7.4; 95% confidence interval, 2.1–29.4). Complementary in vitro studies suggested that the HPV E6 oncoprotein more readily targets the arginine form, as opposed to the proline form, of p53 for degradation. We investigated the impact of this polymorphism in a population-based case-control study of invasive cervical cancer. Using a PCR assay to detect the p53 codon 72 polymorphism, we tested blood samples from 111 women with invasive squamous cell cancer of the cervix identified by a population-based registry and 164 random-digit telephone-dialed controls. The distribution of the genotype among control women was 38% heterozygous, 7% proline homozygous, and 55% arginine homozygous, and among the cases was 38%, 6%, and 56%, respectively. There was no increased risk of squamous cell invasive cervical cancer associated with homozygosity for the arginine allele (odds ratio, 1.0; 95% confidence interval, 0.6–1.7). Furthermore, there was no modification of this result by human papillomavirus (HPV) DNA status of the tumor, age, or smoking status. Among controls, there was no association between the polymorphism and HPV-16 L1 seropositivity. However, among case subjects, the codon 72 polymorphism may be related to HPV 16L1 seropositivity status.

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