CEACAM5 and neoplasm: Abbreviations: CA19–9 = carbohydrate antigen 19–9, CAPEOX = capecitabine and oxaliplatin, CEA = carcinoembryonic antigen, CT = computed tomography, FOLFOX = eucovorin calcium, 5-fluorouracil, and oxaliplatin, ORR = objective response rate, OS = overall survival, PD-1 = programmed death receptor-1, PD-L1 = programmed death ligand-1, PET-CT = positron emission computed tomography, PFS = progression-free survival, pMMR = mismatch-repair proficiency, PS = performance status, SBA = small bowel adenocarcinomas, TMB = tumor mutational burden, VEGFR = vascular endothelial growth factor receptor.