CD8A and neoplasm: In contrast, percent tumor cell lysis upon co-culture with NT CD8+ T cells ranged from 23.8% (E:T = 1:1) to 45.7% (E:T = 10:1) at 6 hours and 26.1% (E:T = 1:1) to 44.8% (E:T = 10:1) at 24 hours (Fig. 2B).