OGG1 and Alzheimer disease: Our analysis on APOC1’638 SNP showed that in AD patients with A/A genotype, the GSH content (p<0.01 vs. UC), GSH/Hcy ratio (p<0.01 vs. UC and RC), 8-oxo2dG level (p<0.05 vs. UC and p<0.001 RC) and 8-oxo2dG/OGG1 ratio (p<0.01 vs. UC and RC) were significantly reduced, as compared to controls with or without family history of AD.