GSTM1 and anemia: Moreover, when the cancer patients were divided into four groups according to the quartiles of Rsf, MRV, and Hb levels in males and females, the incidence of overall anemia showed a decreasing trend with the increasing of their quartiles, respectively (p-trend < 0.01), but the incidence based on Rsf quartiles exhibited a more significant decreasing trend (Fig. 2).