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p53 at the crossroads of MPN treatment.

In this issue of Blood, Lu et al describe the cooperation between an orally bioavailable mouse double minute 2 (MDM2) antagonist (RG7112) and the pegylated interferon α (Peg-IFNα 2a) to target JAK2V617F hematopoietic progenitors and stem cells. Their work provides a rationale for the treatment of patients suffering from myeloproliferative neoplasms (MPNs).