Immune checkpoint HLA-E:CD94-NKG2A mediates evasion of circulating tumor cells from NK cell surveillance

Circulating tumor cells (CTCs) are regarded as “seeds” of tumor metastasis. By dissecting the interaction between CTCs and immunocytes at single-cell scale, Liu et al. propose that CTCs escape immunosurveillance from NK cells by engaging the immune checkpoint HLA-E:CD94-NKG2A. Interrupting the checkpoint efficiently prevents tumor metastasis via the blood circulation.

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