GSTM1 and colorectal carcinoma: As in the CRC risk prediction models, it was possible to verify a significant progressive alteration (p < 0.001) in the CBC in the two groups from 15 months prior to the moment of CRC diagnosis, decreasing for Hb, RBC, MCH, MCV and, MCHC and increasing for RDW (Table 3; Figure 2 and Figure 3).