GPA33 and cholangiocarcinoma: As evident from Table 2 and Supplementary Table 2, CDX2, CDH17, GPA33, and SATB2 exhibited very high and near-identical frequency of positivity in pulmonary metastases from colon (n = 113), rectum (n = 162), appendix (n = 4), small bowel (n = 2), cholangiocarcinoma (n = 1), and esophageal AC (n = 1).