If the mural nodule size is greater than 0.575 cm, but CA19-9 is less than 26.85 U/ml, no history of diabetes, and CEA is greater than 5.245 ng/ml, HGD/pT1a is more likely; if CEA is less than 5.245 ng/ml, LGD is more likely. Here, CEACAM5 is linked to diabetes mellitus.