Athenex, Texas Childrens Cancer Center, and the Center for Cell and Gene Therapy at Baylor College of Medicine to Present Phase 1 Clinical Data for…

Athenex, Inc.

Data presented by investigators from the Texas Childrens Cancer Centers Center for Advanced Innate Cell Therapy and Baylor College of Medicine

Data demonstrate expansion of CAR-NKT cells post-transfer in all patients, and objective responses in patients with relapsed/refractory neuroblastoma

Evidence of therapeutic efficacy with 25% (3/12) Overall Response Rate (ORR), 58% (4 stable disease, 2 partial responses, 1 complete response/12) Disease Control Rate (DCR), and 2 out of 3 responses at dose level 4 (1x108/m2)

Durable Complete Response persisting 12 months

Analysis found that responders correlate with CD62L+ NKT frequency in the pre-infusion products as well as CAR-NKT area under the curve (AUC) in the peripheral blood post-infusion

Well tolerated with no dose limiting toxicity; no immune associated neurotoxicity syndrome (ICANS) at the first four dose levels and one case of grade 2 CRS

BUFFALO, N.Y., May 02, 2022 (GLOBE NEWSWIRE) -- Athenex (NASDAQ: ATNX), a global biopharmaceutical company dedicated to the discovery, development, and commercialization of novel therapies for the treatment of cancer and related conditions, today announced that the Company will present at the upcoming ASGCT 25th Annual Meeting, taking place May 16-19, 2022, in Washington, D.C. The abstract associated with the presentation is now available on the conference website.

Details of the presentations are as follows:

Oral Presentation Details

Abstract 54: Anti-GD2 CAR NKT cells are safe and produce antitumor responses in patients with relapsed/refractory neuroblastomaDate/Time: Monday, May 16, 2022, 2:30 PM 2:45 PM ETSession: Gene and Cell Therapy Trials in ProgressPresenter: Dr. Andras Heczey, Baylor College of MedicineLocation: Room 201, Walter E. Washington Convention Center, 801 Mt Vernon Pl NW Washington, D.C.

Observing evidence of a dose response is extremely encouraging, and we are excited to see two out of three responses at 100 million cells/m2, said Dan Lang, M.D., President of Athenex Cell Therapy. We are hopeful that we will see additional responses as we move to higher doses. We and our partners at Baylor College of Medicine (BCM) and Texas Childrens Hospital (TCH) continue to be motivated by the data and look forward to our next update.

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About KUR-501

KUR-501, is an autologous NKT cell CAR product that targets GD2, a tumor-associated antigen that is expressed on almost all neuroblastomas as well as melanomas, some sarcomas, and a variety of other tumors. GINAKIT2, a phase 1 single arm clinical study (NCT03294954) of KUR-501, in patients with refractory or recurrent high-risk neuroblastoma will evaluate up to six dose levels of KUR-501 following lymphodepletion with cyclophosphamide and fludarabine.

Neuroblastoma, a pediatric cancer of the sympathetic nervous system, typically the adrenal gland, is associated with a poor prognosis in children with high-risk disease and is a significant unmet medical need. The KUR-501 development program will provide autologous proof-of-concept for CAR-NKT cells in solid tumors using a validated target.

The GINAKIT2 study is supported by Athenex, Inc., which acquired Kuur Therapeutics in May 2021, as well as by Alexs Lemonade Stand Foundation. This study is currently recruiting patients at BCM/TCH.

About Athenex, Inc.

Founded in 2003, Athenex, Inc. is a global clinical-stage biopharmaceutical company dedicated to becoming a leader in the discovery, development, and commercialization of next generation cell therapy drugs for the treatment of cancer. In pursuit of this mission, Athenex leverages years of experience in research and development, clinical trials, regulatory standards, and manufacturing. The Companys current clinical pipeline is derived mainly from the following core technologies: (1) Cell therapy based on NKT cells, (2) Orascovery, based on a P-glycoprotein inhibitor, and (3) Src Kinase Inhibition. Athenexs employees worldwide are dedicated to improving the lives of cancer patients by creating more active, accessible and tolerable treatments. For more information, please visit http://www.athenex.com.

Forward-Looking Statements

Except for historical information, all of the statements, expectations, and assumptions contained in this press release are forward-looking statements. These forward-looking statements are typically identified by terms such as believe, look forward to, potential, and similar expressions. Actual results might differ materially from those explicit or implicit in the forward-looking statements. Important factors that could cause actual results to differ materially include: our history of operating losses and the substantial doubt about our ability to continue as a going concern; our strategic pivot to focus on our cell therapy platform and our plan to dispose of non-core assets; our ability to obtain financing to fund operations, successfully redirect our resources and reduce our operating expenses; our ability to refinance, extend or repay our substantial indebtedness owed to our senior secured lender; the development stage of our primary clinical candidates, including NKT Cell Therapy and related risks involved in drug development, clinical trials, regulation, uncertainties around regulatory reviews and approvals; the preclinical and clinical results for Athenexs drug candidates, which may not support further development of such drug candidates; the Companys ability to successfully demonstrate the safety and efficacy of its drug candidates and gain approval of its drug candidates on a timely basis, if at all; the uncertainty of ongoing legal proceedings; risks related to our ability to successfully integrate the business of Kuur into our existing businesses, including uncertainties associated with maintaining relationships with customers, vendors and employees, as well as differences in operations, cultures, and management philosophies that may delay successful integration and our ability to support the added cost burden of Kuurs business; risks related to counterparty performance, including our reliance on third parties for success in certain areas of Athenexs business; risks and uncertainties inherent in litigation, including purported stockholder class actions; the impact of the COVID-19 pandemic and other macroeconomic factors, like the war in Ukraine, and their ongoing impact on our operations, supply chain, cash flow and financial condition; competition; intellectual property risks; risks relating to doing business internationally and in China; the risk of development, operational delays, production slowdowns or stoppages or other interruptions at our manufacturing facility as well as our ability to find alternative sources of supply to meet our obligations and requirements; and the other risk factors set forth from time to time in our SEC filings, copies of which are available for free in the Investor Relations section of our website at http://ir.athenex.com/phoenix.zhtml?c=254495&p=irol-sec or upon request from our Investor Relations Department. All information provided in this release is as of the date hereof and we assume no obligation and do not intend to update these forward-looking statements, except as required by law.

Athenex Contacts

Investors

Daniel Lang, MDAthenex, Inc.Email: danlang@athenex.com

Caileigh DoughertyAthenex, Inc.Email: cdougherty@athenex.com

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Athenex, Texas Childrens Cancer Center, and the Center for Cell and Gene Therapy at Baylor College of Medicine to Present Phase 1 Clinical Data for...