On November 2, 2023 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, reported that preliminary results of the Phase I NATHALI-01 clinical trial evaluating UCART20x22 in patients with relapsed or refractory non-Hodgkin lymphoma (r/r NHL) and updated results of the Phase I BALLI-01 clinical trial evaluating UCART22 in patients with relapsed or refractory CD22+ B-cell acute lymphoblastic leukemia, (r/r B-ALL) will be presented at the American Society of Hematology (ASH) (Free ASH Whitepaper) 65th Annual Meeting (ASH 2023), that will take place on December 9-12, 2023 in San Diego (CA) and online (Press release, Cellectis, NOV 2, 2023, View Source [SID1234636747]).

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These data will be presented in two poster sessions:

Poster Presentation (P2110)

Title: Preliminary Results of Nathali-01: A First-in-Human Phase I/IIa Study of UCART20x22, a Dual Allogeneic CAR-T Cell Product Targeting CD20 and CD22, in Relapsed or Refractory (R/R) Non-Hodgkin Lymphoma (NHL)

Session Name: 704. Cellular Immunotherapies: Early Phase and Investigational Therapies: Poster I

Presenter: Dr. Jeremy Abramson (Massachusetts General Hospital Cancer Center)

Date/Time: Saturday, December 9, 2023 at 5:30 – 7:30 PM PT at San Diego Convention Center, Halls G-H

The poster presentation highlights the following data:

as of July 1, 2023, 3 patients were enrolled and treated at dose level 1 (50 million cells) with product manufactured in-house by Cellectis. Cytokine release syndrome (CRS) Grade 1 or 2 occurred in all patients, and all CRS resolved with treatment.
No immune effector cell associated neurotoxicity (ICANS) or graft versus host disease (GvHD) was observed. There were no UCART20x22 dose limiting toxicities (DLTs), and there was 1 DLT in connection with CLLS52 (alemtuzumab).
All patients responded at Day 28, with 1 partial metabolic response and 2 complete metabolic responses in patients who had failed prior autologous CD19 CAR T-cell therapies.
UCART20x22 expansion correlated with increases in serum cytokine and inflammatory marker levels as well as with CRS.
These initial data support the continued clinical trial evaluating UCART20x22 in R/R NHL.
Poster Presentation (P4847)

Title: Updated Results of the Phase I BALLI-01 Trial of UCART22 Process 2 (P2), an Anti-CD22 Allogeneic CAR-T Cell Product Manufactured By Cellectis Biologics, in Patients with Relapsed or Refractory (R/R) CD22+ B-Cell Acute Lymphoblastic Leukemia (B-ALL)

Session Name: 704. Cellular Immunotherapies: Early Phase and Investigational Therapies: Poster III

Presenter: Dr. Nitin Jain (University of Texas MD Anderson Cancer Center)

Date/Time: Monday, December 11, 2023 at 6:00 – 8:00 PM PT at San Diego Convention Center, Halls G-H

The poster presentation highlights the following data:

in vitro comparability studies suggested that UCART22 Process 2 (P2) (manufactured in-house by Cellectis) is more potent than UCART22 Process 1 (P1) (manufactured by an external CDMO), and as of July 1, 2023, 3 patients were enrolled into the first UCART22 P2 cohort at dose level 2 (1 million cells/kg).
UCART22 P2 was administered after fludarabine, cyclophosphamide, and alemtuzumab (FCA) lymphodepletion regimen and was well tolerated. No DLTs or ICANS was observed, and the CRS observed was Grade 1 or 2.
There was a higher preliminary response rate (67%) at dose level 2 (1 million cells/kg) with UCART22 P2 (manufactured in-house by Cellectis) compared to 50% at dose level 3 (5 million cells/kg) with UCART22 P1 (manufactured by an external CDMO).
UCART22 expansion was observed in the responding patients and correlated with increases in serum cytokines and inflammatory markers.
The study continues to enroll patients at dose level 2i (2.5 million cells/kg) with UCART22 P2.