The level of Log iPTH and the concentration of CRP in CKD patients were higher than those in normal control subjects and increased with the development of CKD (P < 0.001, respectively, Table 1); contrastively, the concentration of Hb was lower than those in normal control subjects and declined with the development of CKD (P < 0.001). This evidence concerns the gene GSTM1 and chronic kidney disease.