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We investigated the changes in cellular components and neutrophil chemotactic factors in pleural fluid from 19 lung cancer patients who received intrapleural injection of OK-432 to treat malignant pleurisy. Not only neutrophil chemotactic activity (NCA) but also neutrophil count and percentage were increased significantly at 6 hours after OK-432 injection. The neutrophil count was significantly correlated with NCA level. The levels of C5a and IL-8 in pleural fluid were increased significantly after OK-432 injection. The increased IL-8 level was associated with a increase of both NCA and neutrophil count. OK-432 treatment also induced a marked increase of IL-1 beta and IL-6 in pleural fluid. Thus, intrapleural injection of OK-432 induced production of neutrophil chemotactic factors (IL-8 and C5a) and cytokines (IL-1 beta and IL-6), which eventually attracted neutrophils into the pleural space. These observations suggest that neutrophil migration mediated by these factors and cytokines may contribute to the sclerosing effects of OK-432 treatment.

OK-432 Induces Production of Neutrophil Chemotactic Factors in Malignant Pleural Effusion.