多原发癌是指一个患者的组织或器官上同时或先后发生两个以上的原发癌。自Billnth’s首先报告以来文献报道逐渐增多,其中发生两个原发癌者最多见,也有多至5个原发癌的报道。随着癌症诊断治疗水平的提高及长期存活病例的增多,多原发癌已成为 Multiple primary cancers refer to the occurrence of two or more primary cancers simultaneously or sequentially in one patient’s tissues or organs. Reports have been gradually increasing since Billnth’s first report, of which the two primary cancers are the most common and there are as many as five primary cancers reported. With the increase in cancer diagnosis and treatment and the increase in long-term survival, multiple primary cancers have become