γδ T cells are effectors of immunotherapy in cancers with HLA class I defects

Vries, N.L. de; Haar, J. van de; Veninga, V.; Chalabi, M.; Ijsselsteijn, M.E.; Ploeg, M. van der; Bulk, J. van den; Ruano, D.; Berg, J.G. van den; Haanen, J.B.; Zeverijn, L.J.; Geurts, B.S.; Wit, G.F. de; Battaglia, T.W.; Gelderblom, H.; Verheul, H.M.W.; Schumacher, T.N.; Wessels, L.F.A.; Koning, F.; Miranda, N.F.C.C. de; Voest, E.E.

doi:doi:10.1038/s41586-022-05593-1

DNA mismatch repair-deficient (MMR-d) cancers present an abundance of neoantigens that is thought to explain their exceptional responsiveness to immune checkpoint blockade (ICB)^1,2. Here, in contrast to other cancer types^3,Show more DNA mismatch repair-deficient (MMR-d) cancers present an abundance of neoantigens that is thought to explain their exceptional responsiveness to immune checkpoint blockade (ICB)^1,2. Here, in contrast to other cancer types^3,4,5, we observed that 20 out of 21 (95%) MMR-d cancers with genomic inactivation of β2-microglobulin (encoded by B2M) retained responsiveness to ICB, suggesting the involvement of immune effector cells other than CD8⁺ T cells in this context. We next identified a strong association between B2M inactivation and increased infiltration by γδ T cells in MMR-d cancers. These γδ T cells mainly comprised the Vδ1 and Vδ3 subsets, and expressed high levels of PD-1, other activation markers, including cytotoxic molecules, and a broad repertoire of killer-cell immunoglobulin-like receptors. In vitro, PD-1⁺ γδ T cells that were isolated from MMR-d colon cancers exhibited enhanced reactivity to human leukocyte antigen (HLA)-class-I-negative MMR-d colon cancer cell lines and B2M-knockout patient-derived tumour organoids compared with antigen-presentation-proficient cells. By comparing paired tumour samples from patients with MMR-d colon cancer that were obtained before and after dual PD-1 and CTLA-4 blockade, we found that immune checkpoint blockade substantially increased the frequency of γδ T cells in B2M-deficient cancers. Taken together, these data indicate that γδ T cells contribute to the response to immune checkpoint blockade in patients with HLA-class-I-negative MMR-d colon cancers, and underline the potential of γδ T cells in cancer immunotherapy.
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γδ T cells are effectors of immunotherapy in cancers with HLA class I defects