Figure S1: Extraction of paraffin-embedded PD-L1+ RCC tissues for RNA isolation. Figure S2: Molecules previously found to be up-regulated in PD-L1+ vs. PD-L1(-) melanomas are not differentially expressed in PD-L1+ RCCs from patients with divergent clinical outcomes after anti-PD-1 therapy. Figure S3: Gene expression in RCC cell lines. Figure S4: In silico analyses of TCGA RCC data do not demonstrate significant associations between UGT1A6 gene expression and overall survival or clinical stage.