CD8A and neoplasm: By leveraging the capacity to assess tumor antigen OVA‐specific SIINFEKL‐tetramer+ (SIINFEKL+) CD8+ T cell responses, we found that the majority of tumor‐reactive T cells were located within the tumor and to a much lesser extent within the spleen and MFP (Supplementary figure 3e and f), suggesting local antigen‐driven expansion.