GSTM1 and anemia (phenotype): Anemia, defined as a reduction in [Hb] to <120 g/l in nonpregnant females and <130 g/l in males (WHO, 1968), is common in patients with chronic liver disease (CLD), with a reported prevalence of 75% (Gonzalez‐Casas, Jones, & Moreno‐Otero, 2009).