Abstract

Cervical adenocarcinomas are now classified as human papillomavirus (HPV)-associated and HPV-independent types with the former being more common. However, population-based studies regarding the relative incidences of the 2 types are few. This study investigates the incidence of cervical adenocarcinomas in Northern Ireland (a country with a relatively stable population of ~1.8 million) over a recent 9-year period (2015-2023). Overall, there were 146 primary cervical adenocarcinomas, 130 HPV-associated (89%) and 16 HPV-independent (11%). The median age was 43 years (range: 24-82) for HPV-associated and 62.5 years (range: 31-84) for HPV-independent neoplasms; this was statistically significant (P < 0.001). The calculated age-adjusted incidence of the patients with HPV-associated and HPV-independent neoplasms was 1.68 and 0.20 per 100,000 person-years, respectively. The HPV-independent neoplasms were more often advanced stage at diagnosis; 97 of 130 (75.4%) of the HPV-associated cases were diagnosed at Stage I compared with 5 of 16 (31.3%) of the HPV-independent cases. The HPV-independent neoplasms were mostly gastric-type (56.3%) with smaller numbers of clear cells and mesonephric. Despite the relatively short follow-up, the mortality of patients with HPV-independent adenocarcinomas was significantly higher than patients with HPV-associated neoplasms (56.3% vs 5.4%) with a median survival of just over a year (13.2mo) in the former for those who died.

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