Adenocarcinoma of the uterine cervix in Ireland and Sweden: human papillomavirus infection and biologic alterations

Abstract

Paraffin-embedded samples from cervical adenocarcinomas, 19 cases from Irish patients and 19 cases from Swedish patients, were analyzed by polymerase chain reaction for the presence of infection with human papillomavirus (HPV). The results were compared with DNA ploidy, proliferation activity, and p53 and p21/WAF1 expression. The studies were performed to discover whether high-risk HPV infection in adenocarcinomas of the uterine cervix is associated with an increased proliferative activity and genomic instability. The results show that the majority (84.6%) of patients 59 years of age or younger showed HPV infection. The overall prevalence of HPV DNA was 60.5%, with the high-risk types, 16 and 18, the most frequent. HPV-16 had a prevalence of 23.7% (9 of 38), and HPV-18 had a prevalence of 26.3% (10 of 38). The HPV-positive tumors predominantly showed a tetraploid DNA distribution pattern, whereas HPV-negative tumors more frequently showed highly scattered aneuploid DNA profiles. Both HPV-positive and HPV-negative cases displayed high proliferative activity, as indicated by high Ki-67 and cyclin A immunoreactivity. Tumor suppressor gene analysis detected low p53 expression and high p21/WAF1 expression in HPV-positive patients and high p53 expression without simultaneously increased p21/WAF1 (indicative of mutated p53) in HPV-negative cases in the groups of women older than 59 years of age.