作者对近20年来的2083例原发性头颈部癌病例的第二癌发生率进行了研究。调查患者吸烟饮酒史,就其重复癌发生的脏器相关性行人年法分析。吸烟和饮酒史调查仅限于全部男性病例和女性舌癌患者。吸烟和饮酒量分为6个等级,由患者自行申报。并与大阪市一般人口恶性肿瘤患病率相比较。 The authors studied the incidence of second cancer in 2083 cases of primary head and neck cancer in the past 20 years. Investigate the history of smoking and drinking in patients, and analyze the organ-related pedestrian-year-by-year method of repeating cancer. Surveys of smoking and drinking history are limited to all male cases and female tongue cancer patients. Smoking and alcohol consumption are divided into 6 levels, which are reported by the patients themselves. And compared with the prevalence of malignancies in the general population of Osaka City.