IND Approval for Phase I/II Study of Anti-HER2 Bispecific ADC JSKN033

Alphamab Oncology announced that a phase I/II clinical trial of JSKN033, a high-concentration subcutaneous co-formulation consisting of anti-HER2 bispecific antibody-drug conjugate (ADC) and PD-L1 immune checkpoint inhibitor, has been approved by the Center for Drug Evaluation (CDE) of the National Medical Products Administration (NMPA). This study has previously been included in the ""Pilot Program for Optimizing the Review and Approval of Clinical Trials for Innovative Drugs"".

JSKN033-102 is an open-label, multicenter, Phase Ⅰ/Ⅱ clinical study designed to evaluate the safety, tolerability, pharmacokinetics/pharmacodynamics and anti-tumor activity of JSKN033 in patients with advanced metastatic malignant tumors, and to determine the maximum tolerated dose (MTD) and/or the recommended phase II dose (RP2D).

JSKN033 is the global first high-concentration subcutaneous co-formulation consisting of ADC and PD-L1 immune checkpoint inhibitor in first-in-human clinical trials. Developed on top of the superior solubility and stability of the world's first subcutaneously injectable PD-L1 inhibitor Envaforlimab, JSKN033 combines immunotherapy (KN035) and ADC (JSKN003), makes ADC subcutaneous injectable and leads to improved safety and convenience. The first-in-human phase I/II clinical study of JSKN033 conducted in Australia (JSKN033-101, NCT06226766) demonstrated favorable safety profile and encouraging anti-cancer activity in heavily treated patients. Detailed clinical data were presented at the Annual Meeting of the Society for Immunotherapy of Cancer in 2024 (SITC 2024).

With the incidence and mortality rates rising year by year, malignant tumors have become the leading cause of death globally and in China. According to relevant research statistics, there were 19.3 million new cancer cases worldwide in 2020, and nearly 10 million people died from malignant tumors. The incidence rates of breast cancer, lung cancer, colorectal cancer, prostate cancer, and gastric cancer rank the top five among all tumor types. Despite significant advancements in immunotherapy and molecular targeted therapies in recent years, the demand for innovative drugs and new treatment options continues to grow among clinicians and patients. Alphamab Oncology has long focused on unmet clinical needs, dedicated to developing differentiated, clinically valuable, and globally competitive new drugs to help cancer patients extend survival and improve the quality of life.

About JSKN033

JSKN033 is the global first high-concentration subcutaneous co-formulation consisting of ADC (JSKN003) and immune checkpoint inhibitor (Envafolimab), which is independently developed by the Company. JSKN003 is a an anti-HER2 bispecific ADC, comprising of three components: a bispecific antibody targeting two non-overlapping epitopes of HER2 extracellular domains, a cleavable linker, and a topoisomerase I inhibitor. Envafolimab is a Fc fusion protein consisting of humanized anti-PD-L1 single domain antibody and human IgG1 Fc fragment, which has been approved by Chinese authorities as the global-first subcutaneous injection PD-(L)1 inhibitor in November 2021. By combining immunotherapy and ADC, JSKN033 is anticipated to significantly enhance efficacy. Leveraging the superior solubility and stability of Envafolimab, this formulation makes ADC subcutaneous injectable and leads to improved safety and convenience. The phase I/II clinical study of JSKN033 for the treatment of HER2-expression advanced or metastatic solid tumors is currently being conducted in Australia.

About Alphamab Oncology

Alphamab Oncology is a leading biopharmaceutical company committed to the development, manufacturing, and commercialization of cutting-edge biotherapeutics for the treatment of cancer. On December 12, 2019, the company was successfully listed on the Main Board of the Hong Kong Stock Exchange, trading under the stock code 9966.

Our integrated platform seamlessly combines research, development, and manufacturing capabilities for biologics. We take pride in our extensive intellectual property portfolio, which encompasses protein/antibody engineering, antibody screening, and multi-module/multi-functional antibody modification.

Distinguished by a globally competitive pipeline, Alphamab Oncology specializes in antibody-drug conjugation (ADC), single domain antibody, and bispecific antibodies. Notably, Envafolimab, the world's first subcutaneously injectable PD-L1 inhibitor, was approved by Chinese authorities in 2021, making a significant breakthrough in the convenience and accessibility of cancer treatment. Three assets are currently undergoing Phase III or pivotal clinical trials, and several other bispecific ADC new drug candidates are in early clinical stage. Multiple strategic collaborations based on innovative products or technology platforms have been established with partners such as CSPC, Arrivent, and Glenmark.

Our overarching mission is to make cancer manageable and curable by addressing unmet clinical needs in oncology. Alphamab Oncology is dedicated to the development of safe, effective and affordable drugs, leveraging a global competitive edge.

Alphamab Oncology Forward-Looking Statements

This press release contains statements related to our future business，financial performance and future events involving Alphamab Oncology that may constitute forward-looking statements. These statements include projections and estimates and relevant assumptions, statements regarding plans and expectations and statements regarding future activities, operations and performance. These statements may be identified by words such as ""expect,"" ""look forward to,"" ""anticipate"" ""intend,"" ""plan,"" ""believe,"" ""seek,"" ""estimate,"" ""will,"" or words of similar meaning. Such statements are based on the certain assumptions of Alphamab Oncology’s management and business operations, which are subject to various risks and uncertainties, including but not limited to political, economic, legal and business environment. The actual results, performance or achievements of Alphamab Oncology may (negatively or positively) vary materially from those described explicitly or implicitly in the relevant forward-looking statements. Unless otherwise required by applicable laws, Alphamab Oncology does not undertake obligation to publicly update any forward-looking statement nor liability for the failure to materialize such forward-looking statements, whether because of new information, future events or otherwise.

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