PD-L1, also known as B7-H, B7H1, PDL1, PDCD1L1 or PDCD1LG1, is an immune inhibitory receptor ligand expressed by hematopoietic and non-hematopoietic cells, such as T-cells and B-cells and many types of tumor cells, that in humans is encoded by the CD274 gene [26]. The gene discussed is CD274; the disease is neoplasm.