Fig. 1
From: Esophageal metastases from primary lung cancer: a case report
Alteration 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 treatment