在同一个体上,先后发生2种以上的原发性恶性肿瘤,称为多原发性癌。近年来,由于对各种癌肿的诊断水平及疗效不断提高,长期生存的病例增加,继第一原发性癌之后,陆续出现第二,第三原发性癌的病例也日趋增加。自从1889年Billroth 首次报告多原发性癌以来,至1981年止,共约有二万五千例。所以,多原发性癌并非罕见。但如果对多原发 In the same individual, two or more types of primary malignant tumors occur successively and are called multiple primary cancers. In recent years, the number of long-term survivors has increased due to the continuous improvement in the diagnostic level and curative effect of various cancers, and the number of second and third primary cancers has continued to increase following the first primary cancer. Since Billroth first reported more than one primary cancer in 1889, there were about 25,000 cases in total since 1981. Therefore, multiple primary cancers are not uncommon. But if you have more than one primary