To investigate clinical value of the combination detections of serum carcinoma-embryonic antigen (CEA),neuron specific enolase(NSE) and cytokeratin 19 fragment(CYFRA21-1) in patients with lung cancer.

• 了解血清肿瘤标志物癌胚抗原(CEA)、神经元特异性烯醇化酶(NSE)和细胞角蛋白19片段(CYFRA21-1)在肺癌诊断中的应用价值。