先后发生于同一患者体内的同一或不同器官的两种或两种以上的原发恶性肿瘤,通常第1个发生的癌称初原发癌即初癌或首癌,而其后发生的癌称为重复性癌或重癌[1]。重复性肺癌是指发生在某一恶性肿瘤患者肺部的第2个原发性恶性肿瘤,其初癌可以是肺癌,也可以是其他脏器的恶性肿瘤。重复性肺癌有别于单纯原发性肺癌,在生物学行为、诊断、治疗选择以及预后等方面都应有自己的特点。 Two or more primary malignancies which occur one after another in the same or different organs of the same patient, usually the first one, are called primary or first carcinomas and the subsequent carcinomas are called Repeat or heavy cancer [1]. Reproductive lung cancer refers to the second primary malignancy that occurs in the lungs of a patient with a malignant tumor whose primary cancer can be either lung cancer or other organ malignancies. Reproductive lung cancer is different from simple primary lung cancer, in the biological behavior, diagnosis, treatment options and prognosis should have their own characteristics.