Trends in the incidence of head and neck cancer by subsite between 1993 and 2015 in Japan.

Middle ear cancer showed a decreasing trend for men (APC −2.2%, 95% CI; −4.4% to −0.1%, between 1994 and 2006 and APC −10.4%, 95% CI; −14.7% to −5.9%, between 2006 and 2014).

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Oral cavity cancer, salivary gland cancer, and oropharyngeal cancer showed an increasing trend during the study period among both men and women (oral cavity: APC 1.2%, 95% CI: 0.4% to 2.1%, for men and APC 1.9%, 95% CI: 0.8% to 3.1%, for women; salivary gland: APC 2.2%, 95% CI: 0.6% to 3.9%, for men and APC 3.1%, 95% CI: 0.5% to 5.8%%, for women; oropharynx: APC 5.0%, 95% CI: 3.8% to 6.2%, for men and APC 7.6%, 95% CI: 4.7% to 10.5%, for women).

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We did not find a significant trend for nasal and paranasal cavity cancer.

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