Cellectis Announces 2026 Strategy and Catalysts

New York, NY – January 8, 2026 - Cellectis (the “Company”) (Euronext Growth: ALCLS - NASDAQ: CLLS), a clinical-stage biotechnology company using its pioneering gene editing platform to develop life-saving cell and gene therapies, today outlined its strategic priorities and key catalysts expected for 2026.

“2025 was a transformational year for Cellectis, as we transitioned to a late-stage development allogeneic CAR-T company with the initiation of a pivotal Phase 2 trial for lasme-cel.” said André Choulika, Ph.D., Chief Executive Officer of Cellectis. “As we enter 2026, we remain fully committed to executing our pivotal Phase 2 BALLI-01 trial for lasme-cel in ALL, with interim data expected in Q4, presenting the full Phase 1 data of the NATHALI-01 trial for eti-cel in NHL, and leveraging the momentum of our strategic partnership with AstraZeneca.”

Allogeneic CAR-T Pipeline

Lasme-cel in r/r B-ALL (BALLI-01)

Following the initiation of the pivotal Phase 2 BALLI-01 clinical trial in October 2025, Cellectis expects to complete the first interim analysis in Q4 2026. This upcoming milestone (n=40) builds upon the encouraging Phase 1 clinical data presented at the Cellectis’ R&D Day, which highlighted:

• Strong Efficacy: 68% overall response rate (ORR) with lasme-cel Process 2 (n=22), 83% at the recommended Phase 2 dose (RP2D) (n=12) and 100% in the target Phase 2 population (n=9). 56% complete remission or complete remission with incomplete hematologic recovery (CR/CRi) rate with ~80% of these patients achieving minimal residual disease (MRD)-negative status in the target Phase 2 population. 60% MRD- negative CR/CRi rate achieved in patients who relapsed following a prior CD22 targeted therapy.
• Strong Survival Benefit: 14.8 months median overall survival (OS) in patients who achieved MRD-negative CR/CRi.
• Favorable Safety Profile: lasme-cel was generally well tolerated, with a single case of grade 2 immune effector cell–associated hemophagocytic syndrome (IEC-HS), which resolved.

Eti-cel in r/r NHL (NATHALI-01)

Building on the preliminary Phase 1 data presented at the American Society of Hematology (ASH) Annual Meeting in December 2025, Cellectis is focused on maximizing the clinical impact of its dual-target CAR-T candidate:

• Phase 1 interim Results: The NATHALI-01 clinical trial demonstrated an encouraging ORR of 88% and a CR rate of 63% at the current dose level, showcasing the potential of eti-cel in r/r NHL patients who have relapsed following multiple lines of therapy including, for most patients, an autologous CD19 CAR-T.
• Q1 2026: Initiation of patient enrollment in the cohort with low dose interleukin-2 (IL-2) support to evaluate the potential to further enhance the already high response rates and durability of response in patients with r/r NHL.
• Q4 2026: The Company expects to report the full Phase 1 dataset, including results from the IL-2 combination.

Strategic Partnerships

AstraZeneca

• Activities are progressing under the Joint Research and Collaboration Agreement with AstraZeneca, which leverages Cellectis’ gene editing expertise and manufacturing capabilities to develop up to 10 novel cell and gene therapy products for areas of high unmet medical need, including oncology, immunology and rare genetic disorders.

Servier / Allogene

• CD19: Servier’s sublicensee Allogene announced that the H1 2026 interim futility analysis from the pivotal Phase 2 ALPHA3 Trial with cema-cel in first-line consolidation large B-cell lymphoma remains on track. Under the Servier agreement, Cellectis is eligible to up to $340 million in development and sales milestones as well as low double-digit royalties on sales.
• CD70: Allogene announced that the TRAVERSE trial in renal cell carcinoma has completed enrollment in its Phase 1b cohort, evaluating ALLO-316 in heavily pretreated patients, and that plans are ongoing to determine the next phase of the program.

Iovance

• Iovance announced that clinical results for IOV-4001, a PD-1 inactivated tumor- infiltrating lymphocyte (TIL) cell therapy, in previously treated advanced melanoma patients are anticipated in the first quarter of 2026, and that other potential indications for IOV-4001 are also in development.

Cash Runway

• Cellectis believes its cash, cash equivalents, and fixed-term deposits will be sufficient to fund its operations into H2 2027.

J.P. Morgan Healthcare Conference

Cellectis management will participate in the 44th Annual J.P. Morgan Healthcare Conference from January 12-15, 2026, and will be available for one-on-one investor meetings. To schedule a meeting, please contact Cellectis Investor Relations at investors@cellectis.com