On March 18, 2019 Celyad (Euronext Brussels and Paris, and Nasdaq: CYAD), a clinical-stage biopharmaceutical company focused on the development of CAR-T cell-based therapies, reported at R&D Day in New York the continued progress of the its pipeline of proprietary CAR-T therapies for the treatment of hematological malignancies and solid tumors, based on its short hairpin RNA (shRNA) platform (Press release, Celyad, MAR 18, 2019, View Source [SID1234534464]).
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"We are very pleased with the recent progress of our preclinical CAR-T pipeline," noted Dr. Christian Homsy, CEO of Celyad. "Together with CYAD-101, our next generation allogenic shRNA platform should allow us to leapfrog the competition in the allogeneic CAR-T landscape. In addition, CYAD-02 has shown encouraging preclinical data of increased CAR-T cell expansion, persistence and anti-tumor efficacy. We continue to tap into our deep expertise and knowledge in cell therapy manufacturing and our all-in-one vector approach provides tremendous flexibility, versatility and efficiency in the design of novel, CAR-T therapies."
Corporate Updates
Lead asset CYAD-01 continues to advance in clinical trials for the treatment of patients with relapsed/refractory (r/r) acute myeloid leukemia (AML). The Company reported that additional dosing and schedule optimization are under evaluation in the THINK Phase 1 trial. In addition, the Company reported that interim data from the DEPLETHINK Phase 1 trial evaluating CYAD-01 following preconditioning chemotherapy shows the CAR-T cell therapy is well-tolerated at the initial dose levels following preconditioning chemotherapy. Future clinical updates from the Phase 1 THINK and DEPLETHINK trials are anticipated by mid-2019.
Company also highlighted its operational excellence for 2018 including a 94% manufacturing success rate and a twofold increase year-over-year in the number of patients treated.
shRNA Platform
In October 2018, Celyad announced it had entered into an exclusive agreement with Horizon Discovery Group for the use of its shRNA technology to generate a novel, next-generation, non-gene-edited allogeneic platform for CAR-T therapies. Horizon Discovery’s SMARTvector technology to express shRNA optimized by Celyad provides an alternate method to knockout the TCR complex in allogeneic CAR-T therapies compared to gene editing techniques as well as the specificity to target a broad range of proteins.
Utilization of the shRNA platform allowed the Company to develop the next generation of autologous, NKG2D-based CAR-T candidate, CYAD-02, and the novel, non-gene edited allogeneic CYAD-200 series of CAR-T candidates.
In addition, the shRNA platform complements the Company’s strong intellectual property of six U.S. patents related to allogeneic T-cell technology and producing TCR deficient cells expressing a CAR construct.
Autologous CAR-T candidate: CYAD-02
CYAD-02 incorporates shRNA technology to target NKG2D ligands MICA/MICB. In preclinical AML models, CYAD-02 shows an encouraging increase in in vitro proliferation and in vivo persistence and anti-tumor activity. The Company plans to generate additional preclinical proof-of-concept data for the program throughout 2019 and plans to submit an Investigational New Drug (IND) application for CYAD-02 in first half 2020.
Non-gene edited allogeneic CAR-T candidates: CYAD-200 series
Celyad utilizes two technologies based on non-gene edited approaches to modulate the T-cell receptor (TCR) complex to generate allogeneic CAR-T therapies. The first approach utilizes our TCR-inhibitor molecule (TIM) and is tailored to our NKG2D-based CAR-T clinical candidate CYAD-101. The second approach leverages shRNA technology exclusively licensed from Horizon Discovery to target the CD3ζ component to knockdown the expression of the TCR/CD3 complex on the surface of the T-cell.
In vivo data demonstrate that shRNA targeting of CD3ζ effectively protects against Graft-versus-Host Disease (GvHD) to a level equivalent to CRISPR-Cas9 based knock-out. Furthermore, results from preclinical tests show significant increase in persistence of allogeneic T cells using shRNA targeting when compared to gene editing technologies, such as CRISPR-Cas9.
Celyad announced plans to develop three disruptive first-in-class non-gene-edited allogenic CAR-T candidates leveraging the shRNA SMARTvector platform, including:
CYAD-211: B-cell maturation antigen (BCMA) targeting CAR-T therapy for the treatment of multiple myeloma, which is expected to enter the clinic by mid-2020.
CYAD-221: CD19 targeting CAR-T therapy for the treatment of B-cell malignancies, which is expected to enter the clinic by late 2020.
CYAD-231: Dual specific CAR-T targeting NKG2D and an undisclosed membrane protein, which is expected to enter the clinic by early 2021.
In addition, the company continues to investigate additional undisclosed targets using the shRNA platform to pair with CARs to develop, differentiated next-generation cell therapies for the treatment of both hematological malignancies and solid tumors.