GSK plc and Hansoh Pharma announced that they have entered into an exclusive license agreement for HS-20093, a B7-H3 targeted antibody-drug conjugate (ADC) utilising a clinically validated topoisomerase inhibitor (TOPOi) payload. Under the agreement, GSK will obtain exclusive worldwide rights (excluding China's mainland, Hong Kong, Macau, and Taiwan) to progress clinical development and commercialisation of HS-20093. This agreement provides GSK with a second clinical-stage ADC that complements GSK's existing capabilities and strengths in developing medicines to address unmet medical needs in various solid tumours.

HS-20093 is currently being investigated in ongoing phase I and II trials in China. Data from the ARTEMIS-001 phase I trial (NCT05276609), for HS-20093 in advanced solid tumours, was presented at the 2023 American Society of Clinical Oncology (ASCO) annual meeting in which initial clinical activity was observed in small cell lung cancer, non-small cell lung cancer and sarcoma with multiple confirmed responses and a manageable safety profile. GSK plans to begin phase I trials for HS-20093 outside of China in 2024.

In October 2023, GSK and Hansoh entered into an agreement for HS-20089, a B7-H4 targeted ADC currently in phase II clinical trials in China. HS-20089 has best-in-class potential in ovarian and endometrial cancer with opportunities in other solid tumours. Under the terms of this agreement, GSK will pay $185 million upfront.

In addition, Hansoh will be eligible to receive up to $1.525 billion in success-based milestones for HS-20093. Upon commercialisation of HS-20093, GSK will pay tiered royalties on global net sales outside of China's mainland, Hong Kong, Macau, and Taiwan.