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Published on: October 11, 2018
Variant of ETV6/ABL1 gene is associated with leukemia phenotype
Joonhong Park1, Myungshin Kim, Jihyang Lim
1Department of Laboratory Medicine, Catholic Blood and Marrow Transplantation Center, The Catholic University of Korea, Seoul, Korea.
Abstract:
The ETV6/ABL1 fusion transcript is thought to be a very rare aberration in hematopoietic malignancies. We describe two new cases of acute leukemia with the ETV6/ABL1 fusion, acute myeloid leukemia with eosinophilia (case 1) and B acute lymphoblastic leukemia (ALL) (case 2), screened by multiplex RT-PCR. The ETV6/ABL1 fusion was also confirmed by fluorescence in situ hybridization using a mixture of BCR/ABL1 and ETV6/RUNX1 probes. A thorough review of all published cases showed that all 7 reported ALL patients possess the type A ETV6/ABL1 fusion transcript, composed of the first 4 exons of ETV6 fused to the second exon of ABL1. The presence of the type A fusion transcript strongly implies ALL manifestation in ETV6/ABL1-positive hematologic malignancies as minor BCR breakpoint in BCR/ABL1-positive ALL.
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