[en] Multiple parameters that contribute to the general immune competence were measured for 145 patients with bronchogenic carcinoma. These same parameters were measured for a group of healthy individuals to establish normal values for each of the tests of immunity. The immunoprofile data for the patients were analyzed on the basis of normal or abnormal measurements to determine the effects of stage of disease, histology, prior surgery and age of the patients on the immune system. A strong stage related correlation with immune impairment was observed in that an increased number of patients with perturbed immunity could be demonstrated for many of the parameters studied