PD-L1 expression in renal cell carcinoma clear cell type is related to unfavorable prognosis - Leite, Katia R. M.; Reis, Sabrina T.; Pontes Junior, José; Zerati, Marcelo; Gomes, Daniel de Oliveira; Camara-Lopes, Luiz; Srougi, Miguel (Diagnostic Pathology, 2015)