Celyad Oncology Presents Updates on Allogeneic CAR T Clinical Candidates and shRNA-based Preclinical Concepts at Research & Development Day - Seite 3

• Celyad Oncology has acquired an exclusive license from the Moffitt Cancer Center for an antibody directed to Tumor-associated glycoprotein (TAG-72), which will form the basis of a T cell engager to be used with our proprietary shRNA platform technology. TAG-72 has been shown to be expressed in a wide variety of epithelial malignant tissues including breast, colon and pancreatic cells and will expand the Company’s program portfolio in solid tumor targets.

Upcoming Milestones

• Additional clinical activity data for the Phase 1 IMMUNICY-1 trial of CYAD-211 for r/r MM are expected during second half 2021.
• Study initiation for KEYNOTE-B79 Phase 1b is expected early fourth quarter 2021.
• Submission of an IND application for CYAD-203 is expected in mid-2022.
• Report additional data from the dose-escalation Phase 1 CYCLE-1 trial evaluating CYAD-02 in relapsed/refractory acute myeloid leukemia and myelodysplastic syndrome in mid-2021.

About Celyad Oncology

Celyad Oncology is a clinical-stage biotechnology company focused on the discovery and development of chimeric antigen receptor T cell (CAR T) therapies for cancer. The Company is developing a pipeline of allogeneic (off-the-shelf) and autologous (personalized) CAR T cell therapy candidates for the treatment of both hematological malignancies and solid tumors. Celyad Oncology was founded in 2007 and is based in Mont-Saint-Guibert, Belgium and New York, NY. The Company has received funding from the Walloon Region (Belgium) to support the advancement of its CAR T cell therapy programs. For more information, please visit www.celyad.com.

Forward-Looking Statement

This release may contain forward-looking statements, within the meaning of applicable securities laws, including the Private Securities Litigation Reform Act of 1995. Forward-looking statements include statements regarding the clinical activity and safety and tolerability of CYAD-211, CYAD-203, and CYAD-101; expectations regarding enrollment and the announcement of additional clinical data; outcomes and timelines of the IMMUNICY-1 clinical trial and plans for initiating KEYNOTE-B79 Phase 1b trial; and the timeline for submission an IND application for CYAD-203. Forward-looking statements may involve known and unknown risks and uncertainties which might cause actual results, financial condition, performance or achievements of Celyad Oncology to differ materially from those expressed or implied by such forward-looking statements. Such risk and uncertainty include the duration and severity of the COVID-19 pandemic and government measures implemented in response thereto. A further list and description of these risks, uncertainties and other risks can be found in Celyad Oncology’s U.S. Securities and Exchange Commission (SEC) filings and reports, including in its Annual Report on Form 20-F filed with the SEC on March 24, 2021 and subsequent filings and reports by Celyad Oncology. These forward-looking statements speak only as of the date of publication of this document and Celyad Oncology’s actual results may differ materially from those expressed or implied by these forward-looking statements. Celyad Oncology expressly disclaims any obligation to update any such forward-looking statements in this document to reflect any change in its expectations with regard thereto or any change in events, conditions or circumstances on which any such statement is based, unless required by law or regulation.