In addition, Quinn et al. [47] reported that mean Hb levels were significantly lower in patients with CRC with uncorrected anemia (no treatment or oral iron) compared to patients with corrected anemia (received 1000 mg of IV FCM) on postoperative day three (9.5 g/dL vs. 10.9 g/dL, p = 0.004). The gene discussed is GSTM1; the disease is colorectal carcinoma.