GSTM1 and systemic inflammatory response syndrome: Pyometra septic: pyometra and ≥ 2 criteria fulfilled for SIRS [5]; pyometra nonseptic: pyometra and fulfilling < 2 criteria for SIRS; HR: heart rate; RR: respiratory rate; WBC: total white blood cell count; PBN: percentage of band neutrophils; Hb: hemoglobin; CRP: C-reactive protein.