Tumor markers in pleural effusions.

AIM The aim of this study was to determine the diagnostic capabilities of tumor markers in pleural effusion and their importance for assessment of the etiology of pleural effusions. PATIENTS AND METHODS In pleural effusions from 166 patients hospitalized during the period 2003-2005 at the Department of Oncology and Radiotherapy, Faculty Hospital in Pilsen, the following tumor markers were determined: thymidine kinase (TK), neuron-specific enolase (NSE), cytokeratins [tissue polypeptide antigen (TPA), tissue polypeptide-specific antigen (TPS) and cytokeratin fragment 19 (CYFRA 21-1)], carcinoembryonic antigen (CEA) and mucinous markers (CA 15-3, CA 19-9, CA 125). The inflammatory marker procalcitonin-PCT was also assessed. RESULTS Tumor markers CA 125, TPA, TPS were significantly elevated in exudates, irrespective of the etiology, as a non-specific reaction in mesothelial cells. TK had a sensitivity of over 80% for all the types of cancer examined, while CA 15-3 had a sensitivity of over 90%. CONCLUSION Significant positivity of PCT and CA 15-3 in pleural effusions indicate a suspicion of inflammatory disease. Positivity of TK and CA 15-3 indicate a strong suspicion of malignant exudates.