Keywords Stomach neoplasms;Lung neoplasms;Colonic neoplasms;Uridine phosphorylase;Gene expression;Reverse transcriptase polymerase chain reaction;

• 胃肿瘤;肺肿瘤;结肠肿瘤;尿苷磷酸化酶;基因表达;逆转录聚合酶链反应;