肺小细胞未分化癌,简称小细胞肺癌,约占肺癌的17—20％。此癌有特异性的组织发生,形态和生物学特性;病灶发展迅速,转移早而快,一般就医时较多出现肺外症状,如肩膝关节酸痛、发热、无力等,常延误诊断和治疗。而多数患者初诊时已进入第三期,影响疗效和预后。此病患者如未经治疗,生存期中位数值为3个月。近年来行 Lung small cell undifferentiated carcinoma, referred to as small cell lung cancer, accounts for about 17-20% of lung cancer. This cancer has specific histogenesis, morphological and biological characteristics; lesions develop rapidly, metastasis is early and rapid, and extrapulmonary symptoms such as shoulder and knee joint pain, fever, weakness, etc., often delay diagnosis and treatment. . Most patients have entered the third phase of the initial diagnosis, affecting the efficacy and prognosis. If the patient has not been treated, the median survival time is 3 months. In recent years