[Concentration of carcinoembryonic antigen in the serum and bronchoalveolar lavage fluid in patients with lung cancer].

Serum and BAL CEA levels were determined in stage I (WHO scale) lung cancer patients. The immuno-enzyme assay for the quantitative determination of CEA according to enzyme-linked immunosorbent assay (ELISA) principle was used. Eight smokers without symptoms of respiratory disease served as a control group.