多原发性恶性肿瘤(MPMT)系指在同一个体上,先后发生两种以上的原发恶性肿瘤(亦称多原发癌或重复癌),而同一脏器内之重复癌又叫多发癌。由于各种癌肿诊断水平和疗效不断提高,长期生存者的增加,继第一原发癌之后,又陆续出现一个以上的原发肿瘤病例也随之增多,对此要有足够认识,转变单从一个癌考虑诊断的旧观念,以区别原发与继发,方可不失治愈之良 Multiple primary malignancy (MPMT) refers to the occurrence of two or more primary malignancies (also known as multiple primary or duplicate cancers) in the same individual, and repeated cancer in the same organ is also called multiple cancers. . As the diagnostic level and therapeutic efficacy of various cancers continue to increase, and the number of long-term survivors increases, following the occurrence of the first primary cancer, more than one case of primary tumors will also appear one after another. Considering the old concept of diagnosis from a cancer to distinguish between primary and secondary diseases