CEACAM5 and gastrointestinal stromal tumor: After performing 5‐fold cross‐validation, the MLP model, which included four features (gender, PGI, PGI/PGII ratio, and CEA, Gender‐Positive‐Gastric‐GIST‐PG‐CEA), achieved an AUC of 0.854, with an accuracy of 0.792, specificity of 0.867, sensitivity of 0.660, PPV of 0.754, NPV of 0.820, and an F1 score of 0.693 in predicting GG (Figure 3B, Table S3).