Core Viewpoint - Kelong Pharmaceutical's subsidiary Sichuan Kelong Botai Biopharmaceutical Co., Ltd. has received approval from the National Medical Products Administration for its antibody-drug conjugate (ADC) A166 (also known as Trastuzumab deruxtecan) for the treatment of adult patients with unresectable or metastatic HER2-positive breast cancer who have previously received one or more anti-HER2 therapies [1] Group 1 - The approved drug targets the human epidermal growth factor receptor 2 (HER2) [1] - The indication is specifically for adult patients with a history of treatment with one or more anti-HER2 agents [1] - This approval represents a significant advancement in the treatment options available for HER2-positive breast cancer patients [1]