To determine if the binding of free anti‐NKG2A on tumor infiltrating CD8 T cells could account for the anti‐tumor response mediated by NK + anti‐NKG2A/Qa1b, we performed an experiment where NK cells were pre‐incubated with anti‐NKG2A or isotype control, and the free mAb was washed off prior to the intratumoral injection of NK cells (Appendix Fig S5A). Here, CD8A is linked to neoplasm.