Via the Alcohol-Related Cancers and Genetic Susceptibility in Europe (ARCAGE) study, which is an international collaboartive case-control study conducted in 15 centres in 11 European countries, and pooling our results with the HPV-AHEAD consortium, we will conduct a systematic analysis of HPV subtypes known or suspected to be involved in head and neck cancer. This will involve investigation of HPV risk by tumour site (oral, oropharynx, hypopharynx, larynx), tumour stage, country, sex and age, and whether risk is modified by exposure to other known or suspected carcinogens including tobacco, alcohol and medical history.