CEACAM5 and gastrointestinal stromal tumor: Considering clinical practice and the feature importance identified by the final MLP model, we established a Positive‐Gastric‐GIST‐PG‐CEA criterion (PGI < 70 ng/mL, PGI/PGII ratio ≥ 3.0, and CEA ≤ 5 μg/L) referring to the cutoff values revealed by the ROC curve.