Abbreviations: AFP = alpha fetoprotein, CA125 = carbohydrate antigen 125, CA199 = carbohydrate antigen 199, CEA = carcinoembryonic antigen, CT = computed tomography, CRS = cytoreductive surgery, 5-Fu = 5-fluorouracil, GC = gastric cancer, HIPEC = hyperthermic intraperitoneal chemotherapy, IP = intraperitoneal, IV = intravenous, NCCN = National Comprehensive Cancer Network, RBC = red blood cell. Here, CEACAM5 is linked to gastric cancer.