STAT5A and neoplasm: To further explore whether Stat5a overexpression on tumor‐specific CD8+ Tpex cells could directly enhance specific cell killing, Slamf6+PD‐1+TIM‐3‐CD8+ Tpex were sorted and Stat5a‐overexpressing CD8+ Tpex cells and vector controls were generated, and then co‐cultured with MOC2‐OVA‐GFP cells (Figure 5f).