CEA, NSE and SCC Ag in bronchial lavage in patients with lung cancer.

CEA, NSE and SCC Ag levels were measured in bronchial lavage (BL) and serum in patients with endobronchial lung cancer (LC) and in patients with nonmalignant lung diseases (NMLD). In both groups of patients 100 ml of normal saline solution was used during the lavage procedure. Tumor markers were detected using radioimmunoassay. CEA levels in BL and in serum were measured in 84 patients with LC and in 94 patients with NMLD. BL CEA levels were significantly increased in patients with LC (97.4 +/- 56.4 ng/ml) in comparison to patients with NMLD (4.2 +/- 6.3 ng/ml). Patients with LC had CEA levels in lavage fluid about 30 times higher than in serum. Significantly increased BL CEA levels in patients with LC were found in the cases with more advanced bronchoscopic tumor and in those with positive bronchial secretion cytology than in other groups of patients with LC. NSE levels were measured in BL and in serum in 21 patients with small cell lung cancer, SCC Ag levels were measured in BL and in serum in 21 patients with squamous cell carcinoma. The control group consisted of 28 patients with NMLD and 8 patients with adenocarcinoma. Determination of CEA levels in BL can be useful additional diagnostic method in patients with LC. The measurement of NSE and SCC Ag levels in BL in LC patients was considered to be not useful because of the low diagnostic sensitivity and specificity.