Objective To study the relationship between Fas protein expression and DNA content in non-small cell lung cancer (NSCLC). Methods Fas protein expression and DNA content in resected samples from 33 NSCLC patients and 17 normal controls were detected by flow cytometry. Fas expression and DNA content were compared with cell proliferation activity which was defined by proliferation index and s-phase fraction (SPF), and with clinicopathological parameters.Results The percentage of DNA aneuploidy in NSCLC was ...