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Apoptotic rate of NSCLC cells following gefitinib treatment. (A) NSCLC cell lines, PC9, H1975 and H1650, were exposed to increasing concentrations of gefitinib and cell apoptosis was measured by an Annexin V/propidium iodide double staining assay. (B) Apoptotic rates of individual cells lines. ##P<0.01 vs. untreated Ctrl of the respective cell lines. NSCLC, non-small cell lung cancer; Ctrl, control.
