Kura Reports Durable Activity of Darlifarnib Plus Cabozantinib in Cabozantinib-Naïve ccRCC at KCRS 2026 on July 28, 2026 cabozantinib cell renal cell carcinoma Clinical Trials Conventional (Clear Cell) Renal Cell Carcinoma darlifarnib Frequency of Responses Kura Oncology Progression-Free Survival VEGFR-targeted therapy +