<prompt> Tumor marker for Ca colon for follow upCEACA 125CA 19-9AFP  <response>: Up to a half of all patients with colorectal cancer will develop liver metastases at some point and regular imaging of the liver by ultrasound and CT scan and measurement of carcinoembryonic antigen CEA is designed to diagnose this early, in order to allow curative metastectomy. Trials of the optimum follow-up pathway have suggested that CEA measurement alone can be as effective as regular imaging.Ref: Bailey and Love, 27e, page: 1266 