VHL and renal cell carcinoma: Tregs isolated from VHL-MUT tumors were less efficient in inhibiting T-effectors proliferation (VHL-MUT: 6.7 ± 3.9% vs VHL-WT: 2.8 ± 1.1%, p = 0.14 Fig. 4B) as confirmed by increased IFN-γ production in co-colture of Tregs:Teff isolated from VHL-MUT-RCC patients (22.8 ± 2.8 vs 12.36 ± 3.9 pg/mL, p = 0.09 Fig. 4C).