Not plasma but nuclear p21 WAF1/CIP1 expression was significantly different between SCLC and NSCLC,while neither of them was correlate with other clinical parameter of lung cancer.

• 2 .；小细胞肺癌与非小细胞肺癌中核 p2 1 WAF1/ CIP1表达存在显著性差异 ( P<0