Alphamab Oncology announced that the New Drug Application (NDA) for anbenitamab injection (KN026), independently developed by the Company and co-developed with JMT-Bio Technology Co., Ltd., a wholly-owned subsidiary of CSPC Pharmaceutical Group Co., Ltd. (stock code: 1093.HK), has been accepted by the National Medical Products Administration (NMPA). KN026 has been applied for as a Class 1 therapeutic biological product and the indication is for use in combination with chemotherapy for the treatment of patients with HER2-positive locally advanced, recurrent, or metastatic gastric or gastroesophageal junction cancer who have failed at least one prior systemic therapy (which must include trastuzumab in combination with chemotherapy).

This NDA for KN026 is primarily based on a pivotal Phase II/III clinical trial (Study ID: KN026-001). Results from the first interim analysis of the Phase III clinical study demonstrated that, compared to the current standard of care, KN026 combined with chemotherapy significantly improved clinical efficacy, by prolonging progression-free survival (PFS) and overall survival (OS). Furthermore, the combination showed no new safety signals, with a low incidence of cardiotoxicity and low immunogenicity in terms of safety profile. Previously, results from the Phase II clinical study, presented at the 2024 European Society for Medical Oncology (ESMO) Congress, showed that KN026 in combination with chemotherapy achieved an objective response rate (ORR) of 40.0%, with a median PFS of 8.6 months as assessed by the independent review committee (IRC). KN026 was granted Breakthrough Therapy Designation by the Center for Drug Evaluation (CDE) of the NMPA on November 4, 2023, and received Priority Review status on August 28, 2025.

Currently, there are no approved anti-HER2 therapies for the second-line treatment of HER2-positive gastric cancer. KN026 is the first HER2 bispecific antibody to demonstrate positive results in the second-line treatment of gastric cancer in China. Meanwhile, multiple pivotal Phase III clinical studies of KN026 in gastric cancer and breast cancer are undergoing smoothly, with the aim of benefiting more patients.