Innovent Biologics (09969) climbed more than 6% during early Hong Kong trading, with gains moderating to 5.24% at press time to HK$17.26. Trading volume reached HK$194 million. The biopharmaceutical firm announced that its self-developed novel BCL2 inhibitor mesutoclax (ICP-248), combined with azacitidine for treating myeloid malignancies including acute myeloid leukemia (AML) and myelodysplastic syndromes (MDS), has received U.S. Food and Drug Administration (FDA) clearance for clinical studies. Public documentation indicates mesutoclax is a novel oral highly selective BCL2 inhibitor. BCL2 serves as a critical regulatory protein in cellular apoptosis pathways, with its abnormal expression linked to development of various hematological malignancies. By selectively inhibiting BCL2, mesutoclax reactivates programmed cell death mechanisms in tumor cells to exert anti-tumor effects.