CK cytokeratin CoeD coeliac disease CPS combined positive score dMMR mismatch repair deficiency EBER EBV-encoded small RNAs EBV Epstein-Barr virus MC medullary carcinoma MMR mismatch repair MSI microsatellite instability NM-SBA nonmedullary small bowel adenocarcinoma PD-L1 programmed death-ligand 1 pMMR mismatch repair proficient SBA small bowel adenocarcinoma SBA-NOS small bowel adenocarcinoma SB-MC small bowel medullary carcinoma SWI/SNF switch/sucrose nonfermentable TIL tumor-infiltrating...