Sacré, Anne, et al. “Prognostic Factors in Second-Line Targeted Therapy for Metastatic Clear-Cell Renal Cell Carcinoma After Progression on an Anti-Vascular Endothelial Growth Factor Receptor Tyrosine Kinase Inhibitor”. Acta Oncologica, vol. 55, no. 3, Mar. 2016, pp. 329-40, doi:10.3109/0284186X.2015.1099731.