PD-1 Expression on Intratumoral Regulatory T Cells Is Associated with Lack of Benefit from Anti–PD-1 Therapy in Metastatic Clear-Cell Renal Cell Carcinoma Patients

PD-1 expression on Tregs is associated with resistance to PD-1 blockade in mccRCC, suggesting that targeting Tregs may synergize with PD-1 inhibition. A model that integrates PD-1 expression on Tregs and CD8+TIM-3-LAG-3- cells has higher predictive value.