In addition, Lima et al. [29] reported an absolute increase in mean Hb of 0.9 g/dL (SD 1.3) from baseline to 12–14 weeks (p = 0.001) in patients with CRC who received 1000 mg of IV FCM every study visit (12–13 weeks) until anemia or ID was corrected. This evidence concerns the gene GSTM1 and anemia (phenotype).