Each year, almost 650,000 patients worldwide receive the diagnosisof head and neck cancer and some 350,000 die from this disease.1Nearly 90% of these cancers are squamous-cell carcinomas. Thetwo main causative factors in approximately 80% of oral, oropharyngeal,and laryngeal carcinomas are smoking and alcohol use. Consumptionof vegetables and fruit may modulate the carcinogenic effectsof tobacco and alcohol, whereas low body-mass index increasesthe risk of oral cancer.2 The idea that human papillomavirus(HPV) plays a role in these cancers has been under investigationfor at least 20 years.
From the Department of Oral Pathology, Institute of Dentistry, Faculty of Medicine, University of Turku, Turku, Finland.
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