Summary:

Accumulating evidence supports that loss of HLA expression contributes to relapse after allogeneic hematopoietic cell transplantation (allo-HCT), but the mechanisms behind this evasion strategy are unclear. The groups of Luca Vago and Raffaella Di Micco identified the polycomb repressive complex 2 (PRC2) as a key epigenetic driver of immune escape after allo-HCT by reducing the chromatin accessibility of HLA class II molecules, which could be targeted by pharmacologic inhibition of PRC2 subunits.

See related article by Gambacorta et al., p. 1449 (10).

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