A Case of Acute Myeloid Leukemia Harboring a Rare Three-Way Translocation t(5;7;7) Involving the PDGFRB Gene and Successfully Treated with Imatinib.

Platelet-derived growth factor-beta (PDGFRB) gene maps for the receptor tyrosine kinase PDGRFβ. PDGFRB gene fusions have been implicated in multiple myeloid and lymphoid neoplasms and have shown exquisite sensitivity to tyrosine kinase inhibitors. We report a case of a 29-year-old male who presented with acute myeloid leukemia who was eventually found to harbor a unique three-way translocation t(5;7;7)(q33.2;q32;q11.2) involving the PDGFRB gene. The patient initially achieved a complete response after induction with daunorubicin and cytarabine, but when he returned for consolidation, his white cell count had increased, and he was found to have an underlying myeloproliferative neoplasm. He was given consolidation with high-dose cytarabine and imatinib with excellent response, and ultimately received a matched unrelated donor transplant. The patient remains in remission to this day more than eight years later.