IDEAYA Biosciences Inc., in collaboration with Jiangsu Hengrui Pharmaceuticals Co., Ltd., has announced an upcoming oral presentation of clinical efficacy and safety data for IDE849 (SHR-4849), a potential first-in-class DLL3-TOP1 antibody drug conjugate $(ADC)$. The data will be presented at the IASLC 2025 World Conference on Lung Cancer, scheduled for September 6-9, 2025, in Barcelona, Spain. The presentation will cover results from a Phase 1 trial conducted by Hengrui in China, involving over 70 small-cell lung cancer (SCLC) patients. IDEAYA is also preparing a poster presentation on pre-clinical synergy data between TOP1-payload based ADCs and its PARG inhibitor, IDE161, which could enhance the durability of ADC treatments. The U.S. Phase 1 trial of IDE849 in SCLC patients was initiated in the third quarter of 2025.