GSK's antibody-drug conjugate risvutatug rezetecan has received Orphan Drug Designation in Japan for small-cell lung cancer, marking its sixth global regulatory designation. The decision was based on phase I trial data showing durable responses in extensive-stage SCLC patients. The drug is currently in phase III development for relapsed ES-SCLC.
Recent developments in breast cancer treatment include new clinical trials for advanced disease, findings on CDK4/6 inhibitor sequencing, and discovery of genetic markers explaining drug resistance in HER2-positive breast cancer.
The ASCENT-04 trial showed sacituzumab govitecan plus pembrolizumab improved progression-free survival in PD-L1-positive TNBC without increased toxicity. Meanwhile, experts debate whether ADCs function as targeted therapy or advanced chemotherapy, with sequencing questions remaining unresolved.
