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RESEARCH PAPER ANALYSIS

The characterization and the impact of CSF pleocytosis during blinatumomab therapy for adult acute lymphoblastic leukemia.

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PMID39155594
JournalLeukemia & lymphoma
Publication Date2024-08-18
Ingested2026-08-02 12:01 AM
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ABSTRACT

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Reactive pleocytosis in the CSF has been observed with blinatumomab but has not been well-described. We performed a retrospective study of 88 patients who received intrathecal chemotherapy (IT) while on blinatumomab with CSF analyzed to determine if pleocytosis had an impact efficacy and safety. Blinatumomab was used for relapsed/refractory 62.5%, MRD-positive 31.8%, and consolidation in MRD-negative 5.7%. The incidence of pleocytosis in CSF was 51% and was more frequent after day 15 (55.8% vs. 18.2%, p = 0.025). Pleocytosis did not impact CR, clearance of MRD positivity, PFS and OS rates. Lower incidence of non-CNS extramedullary relapse was seen (3.7% vs. 30.8%, p = 0.011) with pleocytosis in CSF. Analysis of CSF by flow cytometry showed median CD4:CD8 ratio of 1.34. In conclusion, CSF pleocytosis is prevalent with blinatumomab but only demonstrated lower rates of non-CNS extramedullary relapse but no impact on CNS relapse or neurotoxicity.

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The characterization and the impact of CSF pleocytosis during blinatumomab therapy for adult acute lymphoblastic leukemia.

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