CEACAM5 and pancreatic adenocarcinoma: Major clinical characteristics and administered treatments for the 2 groups of “liver-only” or “lung-only” metastases from pancreatic adenocarcinomas (F: female, M: male; CEA: carcino embryonic antigen, CA 19-9: carbohydrate antigen 19-9; ULN: upper limit of the normal)