Univariate analysis verified that SBP < 100 mm Hg, diastolic blood pressure < 60 mm Hg, heart rate > 100 beats/minutes, hematemesis, Hb level < 10 g/dL, albumin level < 3.0 g/dL, international normalized ratio > 1.5, disseminated malignancy, end-stage renal disease, and ASA score were predictive factors. The gene discussed is GSTM1; the disease is Hematemesis.