Secondary BRAF-mutated histiocytic/dendritic cell sarcoma transdifferentiated from follicular lymphoma with prolonged response to BRAF/MEK inhibition and subsequent evolution to high-grade B-cell lymphoma
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Transdifferentiation from follicular lymphoma (FL) to histiocytic/dendritic cell sarcoma (HDS) is rare and requires molecular confirmation of shared clonal origin. Targetable mutations such as BRAF V600E may offer therapeutic opportunities in such aggressive n... ...