Incidence of Laryngeal Carcinoma in Aichi Prefecture during the Past 5 Years

In co-operation with 15 main hospitals in Aichi prefecture, we investigated the incidence of laryngeal cancer from January 1980 to December 1984. There were 505 cases of fresh laryngeal cancer in Aichi prefecture included 477 in men, 28 in women. The rate was 1.60 per 100,000 person-years (3.02 in men, 0.18 in women). There were 344 cases of the glottic type, 116 of the supraglottic and 23 of the subglottic type. Lymphnode metastasis occurred in 59.4% of the supraglottic type, and 30.3% of the subglottic type. The relative risk for smokers was 1.66 times that for non-smokers in this study.