<prompt> True regarding carcino embroyonic antigen are AE-Is a glycoproteinHelps in knowing recurrence after resectionIncreases in Ca colon associated with only liver metastasisUsually associated with malignancies of GI tract  <response>: Ans. is c i.e., Increase in Carcinoma colon associated with only liver metastasis o Carcino embryonic antigen elevation occurs in about 70 of patients of colon carcinoma. It has got no relation with hepatic metastasis. 