Patients with HRAS-Q61 point mutations experienced worse OS and prognosis compared to HRASwt tumors when treated with checkpoint inhibitors (HR 1.45, 95% 1.01-2.10; p <0.05)...HRAS-Q61 point mutations represent a clinically relevant mutation in UBC, as evidenced by its association with worse clinical outcomes compared to HRASwt tumors. Our transcriptomic analysis suggests HRAS-Q61 mutations were associated with lower response to immunotherapy...