Abstract: We use a human nasopharynx epithelial cell line CNE as an indicator to the effects of pleural effusion from andTdRa lung adenocarsinoma pat'ent on tumor study.cell growth.Growth curve incorporation reveal that this pleural effusion can stimulate CNE cell growth in vitro,It can enhance the growth actioff=of calf, serum.' Different stimulating tions of pleural effusion.We suppose that action is observed various this growth stimulating action stimulating concentra-is certainfactors type of growth stimulating factors in pleural effusion. Occurrencedue to of these in pleural effusion may be related to tumor growth in mV0