Extensive plasma proteomic profiling revealed receptor activator of nuclear factor kappa-Β ligand (RANKL) as emerging biomarker of nivolumab clinical benefit in patients with metastatic renal cell carcinoma =============================================================================================================================================================================================================== * Sonia Simonetti * Michele Iuliani * Marco Stellato * Silvia Cavaliere * Bruno Vincenzi * Giuseppe Tonini * Daniele Santini * Francesco Pantano