(112) used a standardized cell line tissue microarray for quantitative assessment of PD-L1, allowing the comparison of the PD-L1 assays across both time and institution, and found that differences in PD-L1 expression in tissue are independent of the antibody itself used and likely attributable to tumor heterogeneity, assay or platform-specific variables, or other factors. The gene discussed is CD274; the disease is neoplasm.