Antengene Receives FDA Approval of IND for Phase 1 Trial of ATG-101 (PD-L1/4-1BB bispecific antibody) in Solid Tumors and Non-Hodgkin Lymphoma

SHANGHAI and HONG KONG,Nov. 1,2021 --Antengene Corporation Limited ("Antengene",SEHK: 6996.HK),a leading innovative global biopharmaceutical company dedicated to discovering,developing and commercializing first-in-class and/or best-in-class therapeutics in hematology and oncology,today announced that the U.S. Food and Drug Administration (FDA) has approved the Investigational New Drug (IND) application for ATG-101,a bi-specific monoclonal antibody in development as a potential treatment for metastatic/advanced solid tumors and B-cell non-Hodgkin's lymphoma (B-NHL). The IND approval enables Antengene to initiate a Phase 1 clinical trial to evaluate the safety and tolerability of ATG-101 in patients with advanced solid tumors and NHL.

ATG-101 is the first in-house developed innovative molecule with global rights entering clinical stage. This is the second regulatory clearance of ATG-101,following Human Research Ethics Committee (HREC) approval and site initiation for a Phase 1,dose-escalating clinical trial in Australia. In addition,this also marks an important milestone for Antengene as the first IND approval in the U.S.

ATG-101 is a novel bispecific antibody that was designed to block the binding of immunosuppressive PD-L1/PD-1 and conditionally induce 4-1BB stimulation,thus activating anti-tumor immune effectors,with the potential for delivery of enhanced anti-tumor activity and an improved safety profile. ATG-101 demonstrated significant anti-tumor activity in animal models of tumors that progressed on anti-PD-1/L1 treatment,and showed a favorable safety profile in GLP toxicology studies.

"ATG-101 has been designed to provide a newer and more efficacious treatment option for patients with solid tumors and NHL who are resistant or refractory to anti-PD-1/PD-L1 therapies,a growing and increasingly important medical need." said Dr. Jay Mei,Chairman and CEO of Antengene. "Approval of our U.S. IND application for ATG-101 is an important milestone for Antengene. A Phase I dose-escalating clinical trial for ATG-101 is also underway in Australia and the Company plans to submit an IND application in China by year-end. These studies highlight global execution capabilities and further Antengene's vision of Treating Patients Beyond Borders worldwide."

About ATG-101

ATG-101 is a novel PD-L1/4-1BB bi-specific antibody being developed for the treatment of metastatic/advanced solid tumors and B-cell non-Hodgkin's lymphoma (B-NHL). ATG-101 was designed to activate anti-tumor immune effectors,by simultaneously blocking the binding of PD-L1/PD-1 and inducing 4-1BB stimulation. In PD-L1 over-expressing cancer cells,ATG-101 has shown potent PD-L1 crosslinking-dependent 4-1BB agonist activity,with the potential for delivery of enhanced therapeutic efficacy,whilst mitigating risk of hepatoxicity. ATG-101 is being evaluated in Phase I studies in both Australia and the United States for the treatment of patients with metastatic/advanced solid tumors and non-Hodgkin lymphoma.

About Antengene

Antengene Corporation Limited ("Antengene",SEHK: 6996.HK) is a leading clinical-stage R&D- driven global biopharmaceutical company focused on innovative first-in-class/best-in-class therapeutic medicines for oncology and other life-threatening diseases. Driven by its vision of "Treating Patients Beyond Borders",Antengene aims to provide the most advanced anti-cancer drugs to patients in the Asia Pacific Region and around the world. Since initiating operations in 2017,Antengene has obtained 17 investigational new drug (IND) approvals,submitted 6 new drug applications (NDAs) in multiple Asia Pacific markets,with the NDA for selinexor in South Korea already approved through a priority review process. Leveraging partnerships as well as in-house drug discovery,Antengene has built a broad and expanding pipeline of 13 clinical and pre-clinical assets. The Company has global rights on 8 programs and Asia Pacific rights,including the Greater China region,on 5 programs.

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