Expression of the immunosuppressive protein B7 homolog 1 (B7-H1), also known as programmed death ligand-1 (PD-L1), is increased in many pathological conditions, including cancer.

• 免疫抑制蛋白B7同系物1(B7-H1)，亦称程序性死亡配体1(PD-L1)在包括癌症等许多病变中表达增高。