CD8A and temporal arteritis: The median percentage of CD8+ T cells among all detected T lymphocytes constituting the inflammatory infiltrate was 35% in TAB-positive GCA arteries, 19.4% in TAB-negative GCA arteries and 4.6% in TAB-negative non-GCA arteries (Table 1), and was significantly higher in the TAB-positive GCA group, compared to the TAB-negative groups (p < 0.001).