GSTM1 and cryohydrocytosis: Hemoglobin (Hb) levels in the peripheral blood of CHC patients with genotype 1b and high viral loads in groups A and B (13.3 ± 1.3 vs. 13.0 ± 1.8 g/dL at baseline) were markedly lower in group B than in group A (9.8 ± 1.2 vs. 11.5 ± 1.5 g/dL, (p < 0.011)) at the end of the treatment and 11.4 ± 1.7 vs. 12.2 ± 1.7 g/dL (p = 0.289) 12 weeks after treatment cessation.