Elevated expression of TS mRNA in NSCLC tissue specimens compared to normal tissues. Surgical specimens were taken from patients with lung adenocarcinoma (A) or squamous cell carcinoma (S) and the corresponding normal mucosae (N) and subjected to semi-quantitative RT-PCR analysis of TS expression. The data are summarized as mean ± standard deviation relative to β-actin. The size of TS and β-actin PCR products was 337 bp and 500 bp, respectively. S (0.712 ± 0.183) compared with A (0.712 ± 0.183), P < 0.05.