多原发癌（MPC）是患者单个或多个器官、组织中发生2个以上的原发癌．首次由Bforoth于1889年报告，第巨痛与第2癌间隔时间定为6个月．＜6个月的为同时性多原发癌，＞6个月的为异时性多原发癌．1临床资料病例呈：女，56岁．大便变形，粘液血使半年．直肠镜位于区盗线3cm处直肠前 Multiple primary cancer (MPC) is the occurrence of more than two primary cancers in single or multiple organs and tissues. First reported by Bforoth in 1889, the interval between the first major pain and the second cancer was set at 6 months. <6 months for simultaneous multi-primary cancer, >6 months for heterotopic multiple primary cancer. 1 clinical data were presented as: female, 56 years old. Deformation of the stool, mucous and blood for six months. The rectal mirror is located 3cm before the rectum