A novel PML::RARA fusion in acute promyelocytic leukemia: a case report and literature review

, suggesting preserved sensitivity to retinoid-based therapy. Consistent with this prediction, induction therapy with all-trans retinoic acid (ATRA) and arsenic trioxide (ATO) resulted in achievement of complete molecular remission. Molecular relapse occurred three months after premature discontinuation of maintenance therapy, underscoring the leukemogenic potential of this novel fusion. This observation expands the molecular spectrum of APL and highlights the potential value of incorporating RNA sequencing into the diagnostic workflow for morphologically suspected but PCR-negative APL.