重复癌即多原发性恶性肿瘤(multiple pri-mary carcinoma,MPC)是指在同一患者同时或先后发生两种以上互不相连的原发性恶性肿瘤。目前,本病的诊断多采用1889年Billroth提出、后经Warren和Gates 1932年修订的诊断标准:①每一个肿瘤均为恶性;②每个肿瘤有各自的病理形态;③彼此排除互为转移的可能。MPC有同时和不同时之分,大多数文献认为不同原发性癌瘤发生时间相距在6个月以内 Duplicate cancer, ie multiple primary malignant tumor (MPC), refers to the occurrence of two or more primary malignancies that are not connected to each other in the same patient at the same time or in succession. At present, the diagnosis of this disease is mostly based on the diagnostic criteria proposed by Billroth in 1889 and revised by Warren and Gates in 1932: 1 each tumor is malignant; 2 each tumor has its own pathological morphology; 3 exclude each other from each other may. MPC has simultaneous and different time points. Most literature considers the time difference of different primary cancers to be within 6 months.