Abstract
Two patients are presented with carcinoma of the lung who had the carcinoid syndrome. In 1 patient the tumor was an oat cell carcinoma and in the other an undifferentiated carcinoma. Both patients had elevations in the blood serotonin and urinary 5-hydroxyindoleacetic acid levels. Tissue from the primary tumor metastases obtained at autopsy in 1 patient contained substantial amounts of serotonin.

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