Open Access Highly Accessed Research article

HPV type distribution in invasive cervical cancers in Italy: pooled analysis of three large studies

Paolo Giorgi Rossi1*, Mario Sideri2, Francesca Maria Carozzi3, Amina Vocaturo4, Franco Maria Buonaguro5, Maria Lina Tornesello5, Elena Burroni3, Luciano Mariani4, Sara Boveri2, Leandra Maria Zaffina6, Francesco Chini6 and the HPV Prevalence Italian Working Group

Author Affiliations

1 AUSL Reggio Emilia, via Amendola 2, Reggio Emilia 42122, Italy

2 European Institute of Oncology, Milan, Italy

3 ISPO Toscana, Florence, Italy

4 National Cancer Institute Regina Elena, Rome, Italy

5 National Cancer Institute Fond Pascale, Naples, Italy

6 Agency for Public Health, Lazio Region, Rome, Italy

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Infectious Agents and Cancer 2012, 7:26  doi:10.1186/1750-9378-7-26

Published: 12 October 2012

Abstract

Objective

The aim of this study is to describe the prevalence of HPV types in invasive cervical cancers in Italy from 1996 to 2008.

Methods

A pooled analysis of the three largest case series typed to date was performed. HPV typing was performed on paraffin-embedded slices. Molecular analyses were performed in four laboratories. Multivariate analyses were performed to test the associations between calendar time, age, and geographical area and the proportion of types 16/18.

Results

Out of 574 cancers, 24 (4.2%) were HPV negative. HPV 16 and 18 were responsible for 74.4% (378/508) and 80.3% (49/61) of the squamous cancers and adenocarcinomas, respectively. Other frequent types were 31 (9.5%), 45 (6.4%), and 58 (3.3%) for squamous cancers and 45 (13.3%), 31, 35, and 58 (5.0%) for adenocarcinomas. The proportion of HPV 16 and/or 18 decreased with age (p-value for trend <0.03), while it increased in cancers diagnosed in more recent years (p-value for trend < 0.005).

Conclusions

The impact of HPV 16/18 vaccine on cervical cancer will be greater for early onset cancers. In vaccinated women, screening could be started at an older age without reducing protection.