GSTM1 and Sepsis: In a study of 24 critically-ill patients, 15 with sepsis or septic shock and nine without sepsis, and 10 healthy volunteers, Piagnerelli et al. [131] reported that at the time of admission, critically-ill patients had decreased RBC, HCT and Hb and increased MCV (mean corpuscular volume) compared to control, with no differences between sepsis and non-sepsis patients.