ReviewZhonghua xue ye xue za zhi = Zhonghua xueyexue zazhi2026
[KMT2A-rearranged acute lymphoblastic leukemia with lineage switch following relapse: a case report and literature review].
Review in Zhonghua xue ye xue za zhi = Zhonghua xueyexue zazhi, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
To enhance the understanding of lineage switch (LS), we retrospectively analyzed the clinical data of a patient with KMT2A-rearranged acute lymphoblastic leukemia (ALL) who underwent a LS at relapse and reviewed the relevant literature. The patient, a 23-year-old woman, was initially diagnosed with ALL (KMT2A::AFF1-positive). She experienced a relapse during consolidation chemotherapy and achieved a second remission following chemotherapy containing blinatumomab, subsequently bridging to allogeneic stem cell transplantation. Approximately 2 months after transplantation, extensive extramedullary relapse occurred. Immunohistochemical analysis of the extramedullary mass revealed a partial loss of CD19 expression and emergence of MPO expression, whereas the KMT2A rearrangement was retained. After receiving CD19-CAR-T therapy, the patient experienced another extramedullary relapse, at which time complete loss of CD19 expression and positivity for MPO were observed, leading to a diagnosis of myeloid sarcoma. Ultimately, the family opted to discontinue treatment and the patient was discharged to receive care locally. Following antigen-targeted immunotherapy, LS, as a potential mechanism of drug resistance and adaptation, warrants increased clinical attention.
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