Sichuan Kelun-Biotech Biopharmaceutical Co., Ltd. (the "Company") announced that its TROP2-directed antibody-drug conjugate (ADC) sacituzumab tirumotecan (sac-TMT) (佳泰莱^®) in combination with the PD-L1 monoclonal antibody tagitanlimab (科泰莱^®) was granted Breakthrough Therapy Designation by the Center for Drug Evaluation (CDE) of the National Medical Products Administration (NMPA) of China for the first-line treatment of locally advanced or metastatic non-squamous non-small cell lung cancer (NSCLC) without actionable genomic alterations. Breakthrough Therapy Designation is granted for treatment options that demonstrate significant clinical advantages over currently available treatments and is aimed at expediting the research, development and marketing of innovative treatment options that address clinically urgent medical needs. This designation is based on the efficacy and safety data from the non-squamous cohort of the Phase II OptiTROP-Lung01 study.

This marks the fifth Breakthrough Therapy Designation granted to sac-TMT by the NMPA. Sac-TMT has previously received this designation for:

• Locally advanced or metastatic triple-negative breast cancer (TNBC) in July 2022;
• EGFR-mutant, locally advanced or metastatic NSCLC after progression on EGFR-TKI therapy in January 2023;
• Locally advanced or metastatic hormone-receptor positive (HR+) and human epidermal growth factor receptor 2-negative (HER2-) breast cancer (BC) in patients who have previously received at least two lines of systemic chemotherapy in June 2023；
• First-line treatment of unresectable locally advanced, recurrent or metastatic PD-L1 negative TNBC in March 2024.

Results from a Phase 2 OptiTROP-Lung01 study of sac-TMT in combination with tagitanlimab in first-line advanced or metastatic non-squamous NSCLC patients were presented in a poster session at the 2025 American Society of Clinical Oncology (ASCO) Annual Meeting^[1].

Dr. Michael Ge, CEO of Kelun-Biotech said, "This designation by the NMPA highlights the importance of developing novel therapeutic options for diverse NSCLC subtypes. Sac-TMT in combination with tagitanlimab demonstrated clinically meaningful outcomes in key endpoints for patients with non-squamous NSCLC without actionable genomic alterations as a first-line treatment. We are excited about the therapeutic potential of TROP2 ADC- immunotherapy combinations, and we look forward to working with regulatory authorities in China to bring this combination therapy to patients in need as soon as possible."