OGG1 and colorectal carcinoma: The relative gene expression of both glycosylases was significantly higher in non-malignant mucosa of 91 CRC patients (i.e., in samples with appropriate RNA quality) than in corresponding tumor tissue (Figure 1; p = 0.0038 for MUTYH and p = 0.0016 for hOGG1, Mann-Whitney U-test).