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BACKGROUND: Although the serum carcinoembryonic antigen (CEA) concentration is the well-known prognostic marker of non-small cell lung cancer (NSCLC), serum CEA concentration has been reported to be affected by smoking status and body mass index (BMI). There are no previous investigations that examined the relationship between BMI and serum CEA concentration in thoracic disease, including NSCLC. METHODS: Consecutive 384 NSCLC patients and 87 patients with benign thoracic disease were enrolled. The relationship between serum CEA concentration and smoking status and BMI in patients with benign thoracic benign disease and NSCLC was examined. RESULTS: In patients with benign thoracic disease, serum CEA concentration significantly increased with smoking status and Brinkman index. However, serum CEA concentration was not related with BMI. Serum CEA concentration of patients with NSCLC was significantly higher than those with benign disease. In NSCLC patients, the relationship between serum CEA concentration and smoking status was also found. A significant relationship between serum CEA concentration and smoking status was also found in patients with adenocarcinoma which is known to have weaker associations with smoking in carcinogenesis. On the other hand, we failed to find the relationship between serum CEA concentration and BMI in NSCLC patients. CONCLUSION: Serum CEA concentration may be affected by smoking status but not BMI in our Japanese patients with thoracic disease. a

Influence of Smoking Status and Body Mass Index on Serum Carcinoembryonic Antigen Concentration in Patients with Thoracic Diseases