CEACAM5 and gastritis: By analyzing serum samples from 129 patients with GC, 55 gastritis patients, and 116 healthy subjects, we established a diagnostic model combining STARD4-AS1 with serum CEA (arcinoembryonic antigen), CA199 (carbohydrate antigen 199), and CA724 (carbohydrate antigen 724) to assess its effectiveness in diagnosing GC.