Long-term responders to nivolumab in previously treated advanced renal cell carcinoma: a sub-analysis of Meet-URO15 study Long-term responders to nivolumab in previously treated advanced renal cell carcinoma: a sub-analysis of Meet-URO15 study AutoreCarlo Messina PatologiaRene RivistaCancer Immunology Anno2024 DOI Studio di riferimento Meet-URO 15