Fig. 1From: Esophageal metastases from primary lung cancer: a case reportAlteration of carcinoembryonic antigen (CEA) level and treatment at different time points. The patient first presented with an increased CEA level. The carcinoembryonic antigen level gradually decreased to 6.7g/L (normal value, 0–9.8 g/L) following 5 months of gefitinib and chemotherapy treatmentBack to article page