CD8A and neoplasm: Moreover, coculturing peripheral blood mononuclear cells (PBMCs) isolated from ZCVCT26@D‐Gel treated mice with live 4T1 cells significantly expanded frequencies of tumor cell‐reactive CD8+IFN‐γ+ T cells, whereas PBMCs from other groups failed to generate the 4T1 cell‐specific response (Figure 5C).