随着恶性肿瘤诊治技术的进步和平均寿命的延长，多原发癌发生率有增高的倾向。头颈都特别是口腔、中咽及下咽部多原发癌发生率高。该作者自1986年以来，对头颈部癌患者监进行上消化道内窥镜筛选检查，发现多原发癌5例，同时复习日本刮检辑报中的头颈部癌尸％ioJ，进行分析和讨 With the advancement in the diagnosis and treatment of malignant tumors and the prolongation of the average life span, the incidence of multiple primary cancers tends to increase. Head and neck are particularly high incidence of multiple primary cancers in the oral cavity, middle pharynx and hypopharynx. The author has conducted an upper gastrointestinal endoscopy screening of patients with head and neck cancer since 1986. He has found 5 cases of multiple primary cancers and reviewed the head and neck cancer corpse %ioJ in the Japanese Scrapping Report for analysis. discuss