Objective:To examine the cytotoxicity of interleukin 2 (IL 2) and tumor necrosis factor α(TNFα), alone or in combination against human lung adenocarcinoma A549 cell line (A549) and cisplatatin resistant cell (A549)line (A549/DDP) Methods: Cytotoxicity testing in vitro was performedby MTT assay Results: The cytotoxicity of TNFαagainst A549 and A549/DDPwas similar and enhanced respectively when the concentration of TNFαincreased However when combined use of IL 2, the cytotoxicity of TNFαagainst A549...