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复合癌是同一个体发生的两种或两种以上的原发癌。复合癌发生的风险最高是在诊断肿瘤后的5年内。吸烟和饮酒是发生复合癌的主要危险因素。吸烟还可能增加接受放疗的癌症患者发生肺癌的风险。发生复合癌是否影响肿瘤患者生存期,目前尚没有定论。
Complex cancers are two or more primary cancers that occur in the same individual. The highest risk of complex cancer is diagnosed within 5 years after the tumor. Smoking and drinking are the major risk factors for the development of complex cancers. Smoking may also increase the risk of developing lung cancer in cancer patients undergoing radiotherapy. The occurrence of complex cancer affects the survival of patients with cancer, there is no conclusion.