CDX2 and neoplasm: For AMPAC, studies have previously shown that tumor expressing Cytokeratin 20 (KRT 20) correlate to intestinal type, while tumor lacking KRT 20 correlate to pancreatobiliary type [8], Caudal type homeobox 2 (CDX2) positive staining correlate to intestinal type [9, 10], and cytokeratin 7 (KRT 7) is expressed in the majority of pancreatobiliary and a minority of intestinal specimens [11, 12].