chapter  3
Epidemiology of head and neck carcinoma
ByKristen B. Pytynia, Kristina R. Dahlstrom and Erich M. Sturgis
Pages 8

INTRODUCTION Head and neck cancer comprises a diverse array of diseases with distinct anatomical subsites, histopathologic features and risk factors. The most common type of head and neck cancer is squamous cell carcinoma (SCC) of the mucosa of the upper aerodigestive tract (UADT). In 2008, more than 600 000 people worldwide were diagnosed with UADT SCC.1 The incidence of and risk factors for UADT SCC differ by tumour subsite. The ve major subsites are nasopharynx, oral cavity, oropharynx, larynx, and hypopharynx.