GSTM1 and gastric ulcer: In this study, it was not PPI given to all patients post operatively, and patients with severe oesophageal and gastric ulcerations and erosions took PPI drugs before surgery and underwent surgery after the ulcer improved or cured.And all the patients received oral medications and/or blood transfusions as necessary and consequently the early postoperative Hb improvements may be due to the oral medications or/and transfusions rather than the surgery.