Multivariate logistic regression analysis showed that the anemia status of patients with HCV infection after week 12 of treatment was dependent on sex (odds ratio [OR] with 95% confidence interval [CI] = 5.87 [2.87, 12.83], p = 0.001), cirrhosis status (OR [95% CI]: 2.21 [1.98, 5], p = 0.047); FIB-4 (OR [95% CI]: 1.18 [1.02, 1.4], p = 0.046), baseline eGFR (OR [95% CI]: 0.99 [0.99, 1], p = 0.004), and baseline Hb concentration (OR [95% CI]: 0.97 [0.95, 0.99], p = 0.001) before treatment (Table 5). This evidence concerns the gene GSTM1 and anemia (phenotype).