A statistically significant difference in OS was observed in patients with RBC‐TI and Hb ≥ 1.5 g/dL versus patients with no response or reduction in TB (HR 0.12, 95% CI 0.05–0.31, p < 0.001) (Figure 1C and Supporting Information S1: Table 3). This evidence concerns the gene GSTM1 and tuberculosis.