CD274 and neoplasm: Data on housekeeping gene selection, correlation of independent PD-1 and PD-L1 amplicons, correlation of tumor-type expression profiles for candidate gene expression biomarkers between SCMD and The Cancer Genome Atlas (TCGA) profiled tumors, and analytical and clinical validation of the qTP component of the CGP + qTP test (including qRT-PCR and clinical IHC data from >1,000 total FFPE tumors) is described in the Supplementary Methods, Supplementary Results, Table S2, and Figs. S7 and S8.