CD274 and neoplasm: After confirmation of in vivo tumor uptake and tumor-specific FLT enhancement of αPDL1–800, we next validated the ability of the FLT-based metrics (mean ταPDL1 and the normalized amplitude, aT/aNS) for quantifying the baseline variations in tumor PD-L1 expression across multiple animals (n=6), by comparing against WB analysis of whole tumors ex-vivo.