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FELIX trial: Obe-cel for R/R B-ALL

Nov 14, 2025

Learning objective: After reading this article, learners will be able to recall the key outcomes from the FELIX trial.


Do you know... In the FELIX trial (phase II, Cohort A), what was the overall remission (complete remission or complete remission with incomplete hematologic recovery) among patients who received obe-cel?

Obecabtagene autoleucel (obe-cel) is an autologous, anti-CD19 CAR T-cell therapy that is approved for the treatment of adults with R/R B-ALL, based on promising outcomes from the FELIX trial. The FELIX phase I/II, multicenter, single-arm study evaluated the safety and efficacy of obe-cel in adults with R/R B-ALL. Results from the FELIX trial showed obe-cel was associated with durable responses, with a low incidence of Grade ≥3 immune-related toxic effects. Furthermore, obe-cel treatment induces a high incidence of MRD-negative remission (<10⁻⁶ leukemic cells), which predicts better clinical outcomes and supports its use in adults with R/R B-ALL. 

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This educational resource is independently supported by Autolus. All content was developed by SES in collaboration with an expert steering committee; funders were allowed no influence on the content of this resource.

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