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Treatment-related outcomes and patterns of relapse in secondary CNS involvement by large B-cell lymphoma

Alderuccio, J. P.
Baggio, D.
Han, S.
Ghione, P.
Nizamuddin, I. A.
Khwaja, J.
Saha, A.
Dong, N.
Wang, Y.
Cherng, H. J.
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Abstract
Secondary central nervous system (CNS) large B-cell lymphoma (SCNSL) occurs in the de novo setting, as a CNS-isolated relapse, or synchronous (concomitant CNS and systemic) relapse. SCNSL is a devastating event without therapeutic consensus. Thus, we aimed to evaluate treatment outcomes in an international cohort. Progression-free survival (PFS), overall survival (OS) and cumulative incidence of relapse (CIR, estimated using competing-risk models) were reported. Prognostic factors were identified in a 6-month landmark multivariate analysis. Outcomes following thiotepa autologous stem cell transplant (ASCT) and chimeric antigen receptor T-cell therapy (CAR-T) delivered at relapse were compared following propensity score matching (PSM). A total of 1139 patients were included in the analysis (de novo: 537; relapsed SCNSL: 602). 2-year PFS estimates were 40.4%, 43.9% and 16.2% for de novo SCNSL, CNS-isolated relapse, and synchronous relapse respectively. Patients with CNS-isolated relapse demonstrated low rates of systemic recurrence (24-month CIR 6%). Thiotepa-ASCT correlated with longer survival in de novo SCNSL (PFS: HR=0.57; P=0.005; and OS: HR=0.62; P=0.023) and CNS-isolated relapses (PFS: HR=0.55; P=0.002; and OS: HR=0.39; P<.0001) in 6-month multivariable landmark analysis. ASCT (thiotepa or non-thiotepa) also associated with improved survival in synchronous relapses (PFS: HR=0.57; P=0.023; and OS: HR=0.48; P=0.019). Higher survival with thiotepa-ASCT compared to CAR-T was observed in survival analyses following PSM (PFS: HR=0.45; P=0.005 and OS: HR=0.41; P=0.014). These data support thiotepa-ASCT in eligible patients, particularly de novo disease and CNS-isolated relapses. CNS-isolated relapse was infrequently associated with systemic recurrence, supporting treatment regimens adopted from primary CNS lymphoma.
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2026
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Alderuccio JP, Baggio D, Han S, Ghione P, Nizamuddin IA, Khwaja J, et al. Treatment-related outcomes and patterns of relapse in secondary CNS involvement by large B-cell lymphoma. Blood. 2026 Jan 5. Epub 2026/01/06.
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