Clinical evidence of secretory IgA and Schwangerschaftsprotein 1 in pleural effusions of lung cancer patients.

Secretory immunoglobulin A, alpha 1-fetoprotein, orosomucoid and alpha 2-macroglobulin have been estimated in pleural effusions of 11 lung cancer patients. Secretory immunoglobulin could be detected in all cancer patients except one with a secondary embolism. Levels could be found between 0.19 and 0.73 g/l. No SIgA could be detected in a control group of 7 patients with pleural effusions of other origin.