uPAR+ extracellular vesicles: a robust biomarker of resistance to checkpoint inhibitor immunotherapy in metastatic melanoma patients ==================================================================================================================================== * Letizia Porcelli * Michele Guida * Simona De Summa * Roberta Di Fonte * Ivana De Risi * Marianna Garofoli * Mariapia Caputo * Antonio Negri * Sabino Strippoli * Simona Serratì * Amalia Azzariti