GSTM1 and anemia: Our results are in agreement with Elnaggar et al.'s [27] study, in which they demonstrated that slightly higher mean Hb levels were found in HCV-positive (Hb = 8.02 ± 1.08 g/dL) HD patients than in HCV-negative (Hb = 7.64 ± 2.15 g/dL) HD patients, but anemia persisted in their results.