Also, Bassi et al. found that positive CEA and/or co-presence of more than two positive serum markers (CEA, CA 19-9, or CA 125) were indicative of presence of mucinous cystic tumors, i.e., MCN and IPMN (31). This evidence concerns the gene CEACAM5 and pancreatic intraductal papillary-mucinous neoplasm.