Πέμπτη 19 Μαΐου 2016

A new variant of acute promyelocytic leukemia with IRF2BP2-RARA fusion

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Summary

We present an acute promyelocytic leukemia (APL) patient with two subtypes of IRF2BP2-RARA, in which the IRF2BP2 gene showed completely new breakpoints. Bone marrow examination revealed morphologic features indicative of APL. However, promyelocytic leukemia-RARA fusion was not detected. Generation paired-end mRNA sequencing followed by RT-PCR and direct sequencing revealed two types of fusion transcripts between exon 1B of IRF2BP2 and exon 3 of RARA. The patient received all-trans retinoic acid and conventional chemotherapy, but showed resistance. This is the second report of IRF2BP2 involvement in APL, and we describe various breakpoints for the IRF2BP2-RARA fusion gene.

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