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在同一个体上同时或先后发生两种以上的恶性肿瘤,并可排除系复发或转移者称为重复癌。亦称为原发性多发性癌。随着诊断技术的提高,团检之普及和治疗水平的提高,恶性肿瘤患者长期得以存活的病例日见增加,因此,近年来重复癌的病例报告亦渐增加。重复癌在欧美发生率较高,约占恶性肿瘤病例数之2.8～7.8%,而日本重复癌之发生率约为恶性肿瘤病例之1～2%,但近年有所增长。
Two or more malignant tumors occur at the same time or in the same individual and can be ruled out as recurrent cancers if the relapse or metastasis is ruled out. Also known as primary multiple cancer. With the improvement of diagnostic technology, the popularity of mass inspections and the improvement of treatment, the number of cases of patients with malignant tumors that have long been able to survive has been increasing day by day. As a result, cases of repeated cancer cases have also increased in recent years. The frequency of repetitive cancers in Europe and the United States is relatively high, accounting for approximately 2.8 to 7.8% of the number of malignant tumors, while the incidence of repeated cancers in Japan is approximately 1 to 2% of the cases of malignant tumors, but has increased in recent years.