Hb 4.4 g/dL, reticulocyte percentage 6.3% (0.5–1.5), lactic dehydrogenase 499 U/L (95–213), total bilirubin 2.40 mg/dL (0.2–1.6), direct and indirect Coombs’ tests were positive, the potential etiologies of AIHA were ruled out. Here, GSTM1 is linked to autoimmune hemolytic anemia.