EPIDEMIOLOGY

EPIDEMIOLOGY

There is considerable geographical variation in the incidence of oral cancers worldwide, reflecting di ff ering lifestyles and risk factor exposure. For clarity , and in keeping with the 11th revision of the International Classification of Diseases (ICD-11), we will include cancers of the lip, gum, tongue, palate and floor of the mouth as well as the rest of the mouth in oral cavity cancer. Cancers of the nasopharynx, hypopharynx and major salivary glands are excluded. The oropharynx includes the base of the tongue, the soft palate/uvula, the pharyngeal walls and the tonsils. Cancers arising in the oropharynx are discussed separately in Chapter 52 . EPIDEMIOLOGY

There is considerable geographical variation in the incidence of oral cancers worldwide, reflecting di ff ering lifestyles and risk factor exposure. For clarity , and in keeping with the 11th revision of the International Classification of Diseases (ICD-11), we will include cancers of the lip, gum, tongue, palate and floor of the mouth as well as the rest of the mouth in oral cavity cancer. Cancers of the nasopharynx, hypopharynx and major salivary glands are excluded. The oropharynx includes the base of the tongue, the soft palate/uvula, the pharyngeal walls and the tonsils. Cancers arising in the oropharynx are discussed separately in Chapter 52 .