Celyad Oncology Provides Fourth Quarter 2023 Business Update and 2024 Outlook

Celyad Oncology (Euronext: CYAD) (the “Company”), today provides a fourth quarter 2023 business update and an outlook for 2024.

Michel Lussier, interim Chief Executive Officer of Celyad Oncology, commented: “2023 has been a very important year for Celyad Oncology, after the changes that occurred in 2022. Our research team has made a remarkable progress to broaden the range of cancer indications that could be targeted by chimeric antigen receptor (CAR) T-cells and to tackle the main limitations of current CAR T-cell therapies. We have shared new data at several scientific and business conferences along the year, and published in high impact peer-reviewed journals. We are eager to see the impact of our efforts to unleash the power of our IP estate and stay at the forefront of next-generation CAR T-cell development.”

2023 corporate accomplishments

• On August 24, 2023, the Company announced that it obtained commitments from Fortress, Tolefi and other longstanding existing shareholders to subscribe to a capital increase of up to €9.8 million in 2 tranches:
  • A first tranche of 2.0 million was disbursed in the context of authorized capital as of September 4, 2023; and
  • A second tranche subscribed by Fortress was approved by the extraordinary shareholders’ meeting of November 14, 2023. Following this private placement, the Company believes that its existing cash and cash equivalents should be sufficient, based on the current scope of activities, to fund operating expenses and capital expenditure requirements into the second quarter of 2025.

2023 operational highlights

• Multiplex short hairpin ribonucleic acid (shRNA) non-gene edited technology – All along 2023, we have collected and presented data validating our shRNA multiplexing approach:
  • We developed a chimeric micro-RNA (miRNA) cluster to enable multiplexing of shRNAs, designed for easy, efficient, and tunable downregulation of up to four target genes simultaneously in CAR T-cells;
  • Results detailing the technical aspects of the development of this platform have been published in Molecular Therapy – Nucleic Acids (Mol Ther Nucleic Acids. 2023, 34:102038). This publication has raised much interest from the community and was subjected to an editorial comment in the same volume of the Journal (Mol Ther Nucleic Acids. 2023, 34:102077);
  • Additional data which demonstrate feasibility of this approach in the context of allogeneic cell therapies or with the aim to create therapies able to overcome the coinhibitory effects of exhaustion markers were presented at several scientific conferences. Posters are available on the company’s website, at https://celyad.com/our-science-technology/publications/.
• Multispecific NKG2D-based CAR T-cell platform – In 2023, we have compiled and presented data validating our multispecific approach targeting NKG2D ligands (NKG2DL):
  • We have developed different CD19/NKG2DL, BCMA/NKG2DL and PSMA/NKG2DL multispecific CAR T-cells, utilizing both tandem constructs – that encompass the extracellular domain of the natural NKG2D receptor fused to a scFv targeting CD19, BCMA or PSMA, or dual constructs – that co-express the NKG2D-based CAR with an anti-CD19, anti-BCMA or anti-PSMA CAR, respectively;
  • Our data provides the proof-of-concept that NKG2DL are valuable targets in a multispecific CAR approach and demonstrate our CD19/NKG2DL multispecific CAR T-cells are highly effective to counteract relapses due to CD19 antigen loss in vivo. In vitro data generated with BCMA/NKG2DL and PSMA/NKG2DL multispecific CAR T-cells further validate this approach in other hematological and solid indications. Posters are available on the company’s website, at https://celyad.com/our-science-technology/publications/.

Financial highlights