Abstract
Driver genomic alterations in pediatric immature T-cell acute lymphoblastic leukemia are not fully known. We report two cases of novel EVX fusions involved in the transcriptional activation of HOX family genes, ETV6::EVX2 and MSI2::EVX1/HOXA13, which activate HOXD and HOXA cluster genes transcription through enhancer hijacking. HOXA and HOXD were the only key transcription factors activated in these cases, which indicates their important roles in leukemogenesis. Our findings elucidate potential drivers for development of T-cell lymphoblastic leukemia, and are valuable for diagnosis and risk stratification of pediatric T-ALL in the era of precision medicine.
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