1.1. Background: Gastric cancer is one of the most common cancers in the world. Gastric cancer usually occurs at an advanced age (average ≥ 65 years) and has symptoms similar to gastric ulcers and other gastric infections, its early diagnosis is one of the major problems of this type of cancer. Molecular mechanisms initiate cancer and the molecular changes of normal cells compared to cancer cells are very important. dysfunction of Fucosyl transferase enzymes is associated with gastric cancer.