GSTM1 and ulcerative colitis: In patients with ulcerative colitis, the efficacy of oral SI (60 mg elemental iron/day for 60 days, plus 30 mg/day for 30 additional days) in increasing Hb concentrations was similar to that of IV FCM (1000 mg, at baseline) (mean Hb change: +1.1 g/dL vs. +1.5 g/dL, respectively; p = NS) [71] (Table 3).