Malignant pleural effusion is a common complication of cancer. Intrapleural beta interferon has been recently tested, and responses were obtained in about 1/3 of the patients without considerable side effects. We treated 22 patients with recurrent symptomatic malignant pleural effusions with intrapleural beta interferon at increasing doses (5-15 million units) for a maximum of three courses and obtained only two responses. In our opinion, this schedule cannot be recommended for routine use.
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