ANGLE’s Portrait PD-L1 service is an end-to-end solution using cutting edge CTC technology with the potential to facilitate: minimally invasive liquid biopsy with sample stability out to 5 days post collection; identification and enumeration of CTCs; highly accurate, repeatable, and precise PD-L1 CTC results; early competitive advantage by understanding therapeutic response sooner; optimized patient selection; reduced trial size, costs and time; longitudinal monitoring of PD-L1 status on phenotypic variety of CTCs.