原发性多发性癌(以下简称 MPC)是指同一宿主的单个或多个器管组织发生两个以上的原发癌而言。在癌肿患者中,其发病率不仅可高达13.1%,而且近年有增多之势。MPC 是一个十分值得注意的临床疑难问题,其重要性在于:(1)它易与转移癌,复发癌互混,鉴别 Primary multiple cancer (hereinafter referred to as MPC) refers to the occurrence of more than two primary cancers in single or multiple organelle tissues of the same host. In patients with cancer, the incidence rate can not only be as high as 13.1%, but has increased in recent years. MPC is a very clinically difficult problem that is worth noting. Its importance lies in: (1) It is easy to be miscible with metastatic and recurrent cancers.