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The cytotoxicity of aspirin plus erlotinib in carcinoma cells. (A) The carcinoma cells were treated with indicated drugs for 72 h. The cytotoxicity of aspirin, erlotinib or the combination were showed. (B) A549/NCI-H1299 cells were incubated with drugs for 14 days, and then stained with crystal violet. *P<0.05 and **P<0.01
