多原发性恶性肿瘤即一个患者的组织或器官上同时或先后发生两个以上原发性恶性肿瘤。自 Billroth′s 首先报告以来,文献报导逐渐增多,其中发生两个原发性恶性肿瘤者最多见,也有多至五个原发癌的报导。关于诊断,近年来多采用 Warren 提出的标准,即每一个肿瘤必须是经病理确诊的恶性肿瘤,必须排除转移或复发瘤的可能。依据这一标准,我院于1965～1978年收治过多原发性恶性肿瘤9例,现摘要报告如下: Multiple primary malignancies, i.e., one or more patients, have two or more primary malignancies occurring simultaneously or one after the other. Since Billroth’s first report, there has been an increase in the number of reported reports, of which the two most common malignancies are the most common, and there are also reports of up to five primary cancers. With respect to diagnosis, Warren’s standard has been adopted in recent years. That is, each tumor must be a malignant tumor confirmed by pathology, and the possibility of metastasis or relapse must be excluded. According to this standard, 9 cases of excessive primary malignant tumors were treated in our hospital from 1965 to 1978. The summary report is as follows: