多原发癌临床上较为少见,常不易确诊。作者自1982年以来共遇5例,兹报告于后。例1:女性,65岁;1982年因左乳癌行根治术,4年后发现左肺上叶有一圓形块影,2×2.5cm大小,疑为转移性肿瘤,行左上肺叶切除术,病检报告为:末梢支气管——肺泡癌”。例2:女性,40岁。1983年因左乳癌(病检系单纯癌及硬癌)行根治术,10个月后出现进食梗噎感,经食道拉呵及钡餐检查拟诊为“食道下段及贲门部癌”而行食道下段及贲门部切除,胃代食道主动脉弓下吻合术,病检报告为“胃粘液腺癌,浸润浆膜层及食道粘膜下浅肌层”,一年后因肝脏转移及腹水而死亡。例3:男性,60岁。体检发现左肺上叶块影而于1984年行左上肺叶切除术,发现左 Multiple primary cancers are rare in clinical practice and are often not easily diagnosed. The authors have encountered 5 cases since 1982 and are hereby reported. Example 1: Female, 65 years old; in 1982, radical mastectomy was performed in the left breast, and 4 years later, there was a round block in the upper lobe of the left lung, 2 x 2.5 cm in size, suspected metastatic tumor, and left upper lobe resection. The report was: Peripheral bronchus-alveolar carcinoma. Example 2: Female, 40. In 1983, due to radical mastectomy in the left breast cancer (disease and hard cancer), there was a craving for eating after 10 months. The esophageal pull and barium meal examination was diagnosed as “lower esophagus and cardia cancer” and the lower esophagus and cardia were resected and the gastro-esophageal esophageal aortic arch anastomosis was performed. The disease report was “stomach mucinous adenocarcinoma, infiltration of serosa and esophagus. ”Submucosal superficial muscularis" died one year later due to hepatic metastasis and ascites. Example 3: Male, 60 years old. Physical examination revealed left upper lobe shadows and left upper lobe lobectomy in 1984 and left