Human PD-1/PD-L1 Checkpoint Pathway qPCR Array is designed to facilitate gene expression profiling of 88 key genes involved in human PD-1/PD-L1 checkpoint pathway, and to help identifying potential prognostic biomarkers for cancer immunotherapy. PD-1/PD-L1 checkpoint pathway plays an important role in the maintenance of T cell stability, as well as mediating inhibitory signals for proliferation and function of T effector cells. PD-1/PD-L1 immune checkpoint blockade has resulted in enhancement of T cell immunity against tumors and viral pathogens. Brief examples of how genes may be grouped according to their functions are shown below: