OGG1 and adenoma: The level of OGG1 expression when comparing lesions did not differ between adenoma and CRC cases P = 0.34, (Fig 1B), but for normal colonic mucosa the OGG1 expression in CRC patients was statistically significantly lower than in normal colonic mucosa from adenoma cases with mild/moderate dysplasia, P = 0.012, (Fig 1B).