Cellectis (the "Company") (NASDAQ:CLLS), a clinical-stage biotechnology company using its pioneering gene editing platform to develop life-saving cell and gene therapies, today announced that the U.S. Food and Drug Administration (FDA) granted Regenerative Medicine Advanced Therapy (RMAT) designation to lasmecabtagene timgedleucel (lasme-cel), its CD22-targeting allogeneic CAR-T cell therapy product candidate, for the treatment of patients with relapsed or refractory B-cell acute lymphoblastic leukemia (r/r B-ALL).

The granting of RMAT designation reflects the FDA's recognition of the potential for lasme-cel to address the unmet medical need faced by patients with r/r B-ALL.

The RMAT designation is supported by Phase 1 BALLI-01 data demonstrating promising efficacy and a manageable safety profile. Final Phase 1 data from the BALLI-01 trial of lasme-cel will be presented in an oral session at the 2026 Congress of the European Hematology Association (EHA) this Saturday, June 13 at 5:15 – 6:30pm CET by Nitin Jain, M.D., Professor of Medicine, Department of Leukemia at MD Anderson Cancer Center in Houston (TX).

The BALLI-01 trial Pivotal Phase 2 is open for enrollment.