Ascentage Pharma's Bcl-2 Inhibitor APG-2575 Granted Orphan Drug Designation by the FDA for the Treatment of Chronic Lymphocytic Leukemia

SUZHOU,China and ROCKVILLE,Md.,Sept. 7,2020 --Ascentage Pharma (6855.HK),a globally focused,clinical-stage biotechnology company engaged in developing novel therapies for cancers,chronic hepatitis B (CHB),and age-related diseases,today announced that the US Food and Drug Administration (FDA) has granted APG-2575,a novel Bcl-2 inhibitor being developed by the company,an Orphan Drug Designation (ODD) for the treatment of chronic lymphocytic leukemia (CLL). This is the second ODD granted for APG-2575,following the previous ODD granted by the FDA in July for the treatment of Waldenström Macroglobulinemia (WM).

The term "orphan drugs" refers to pharmaceutical products developed for the prevention,diagnosis,and treatment of rare diseases or conditions. In the United States,an orphan disease is defined as a disease or condition with a prevalence of less than 200,000 patients in the country. Since the Orphan Drug Act was passed in 1983,the US government has provided incentives and policy support to encourage development of orphan drugs. This ODD from the FDA qualifies APG-2575 for various development incentives,including a tax credit on expenditures incurred in clinical studies,a waiver of the New Drug Application (NDA) fee,research grant awarded by the FDA,and most importantly,7 years of US market exclusivity upon approval for the treatment of CLL.

CLL is a form of leukemia among adults,characterized by progressive accumulation of abnormal lymphocytes cells in the peripheral blood,bone marrow and lymphoid tissues. The American Cancer Society estimates the U.S will have approximately 21,040 new cases of CLL and about 4,060 deaths from the disease in 2020[1]. The most recent SEERs update reiterates that the prevalence of CLL remains below 200,000 in the USA[2]. Development of Bruton tyrosine kinase (BTK) inhibitors and Bcl-2 inhibitors have improved the outcomes of patients with CLL; however,there is still the medical needs for therapies with improved safety profile and shortened ramp-up schedule that achieve deep responses with shorter duration of treatments especially for chemotherapy free regimens in CLL.

APG-2575 is a novel,orally administered Bcl-2 selective inhibitor being developed by Ascentage Pharma. APG-2575 is designed to treat a variety of hematologic malignancies by selectively blocking Bcl-2 to restore the normal apoptosis process in cancer cells. APG-2575 is one of the few Bcl-2 selective inhibitors currently in active clinical development worldwide and the first China-developed Bcl-2 selective inhibitor having entered clinical trials in China. APG-2575 has received clearances and approvals for multiple Phase Ib/II clinical studies in China,Australia,and the US in a range of hematologic malignancies,including a global Phase Ib/II clinical study of APG-2575 as a single agent or in combination with other therapeutic agents in patients with relapsed/refractory CLL/ SLL (small lymphocytic lymphoma). The study is currently recruiting in US and Australia.

"At present,CLL still presents considerable unmet medical needs. APG-2575 is a key drug candidate in Ascentage Pharma's pipeline targeting apoptosis. The APG-2575 received this ODD from the FDA shortly after the first ODD in WM,and this designation will be helpful in enhancing our communication with the FDA and expediting our development of APG-2575 in these rare cancer diseases," said Dr. Yifan Zhai,Chief Medical Officer of Ascentage Pharma. "All the policy support and incentives as a result of this ODD will help us accelerate the global clinical development of APG-2575,which we hope will soon offer additional treatment options for patients with CLL."

References:

1. Cancer Statistics 2020,American Cancer Society

2. 2020 Cancer Incidence Data,Surveillance,Epidemiology,and End Results Program,National Cancer Institute

About APG-2575

APG-2575 is a novel,orally administered Bcl-2‒selective inhibitor being developed by Ascentage Pharma. APG-2575 is designed to treat a variety of hematologic malignancies by selectively blocking Bcl-2 to restore the normal apoptosis process in cancer cells. Ascentage Pharma has previously commenced Phase I studies of AGP-2575 single agent in China,and the United States. Since March 2020,the company has received approvals and clearances for several Phase Ib/II studies of APG-2575 in China,and the US,and is advancing clinical development of APG-2575 for a variety of hematologic malignancy indications,including relapsed/refractory chronic lymphocytic leukemia or small lymphocytic lymphoma,Waldenström macroglobulinemia,relapsed/refractory multiple myeloma,and relapsed/refractory acute myeloid leukemia. APG-2575 was recently granted two orphan drug designations by the US Food and Drug Administration in the treatment of Waldenström Macroglobulinemia and Chronic Lymphocytic Leukemia.

About Ascentage Pharma

Ascentage Pharma is a globally,CHB,and senesce diseases. On October 28,2019,Ascentage Pharma was listed on the Main Board of the Stock Exchange of Hong Kong Limited with the stock code: 6855.HK.

Ascentage Pharma focuses on developing therapeutics that inhibit protein-protein interactions to restore apoptosis,or programmed cell death. The company has built a pipeline of eight clinical drug candidates,including novel,highly potent Bcl-2,and dual Bcl-2/Bcl-xL inhibitors,as well as candidates aimed at IAP and MDM2-p53 pathways,and next-generation tyrosine kinase inhibitors. Ascentage Pharma is also the only company in the world with active clinical programs targeting all three known classes of key apoptosis regulators. The company is conducting more than 40 Phase I/II clinical trials in the US,and China. The company has submitted a New Drug Application for its core drug candidate HQP1351 in China. HQP1351 was recently granted orphan drug and fast-track designations by the US Food and Drug Administration (FDA),APG-2575,another key drug candidate of the company,was recently granted two orphan drug designations by the FDA.

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