Programmed death-ligand 1 (PD-L1) expression in various tumor types

Meeting abstracts Programmed cell death-1 (PD-1) is a co-inhibitory receptor expressed on lymphoid and non-lymphoid-derived cells that negatively regulates peripheral T-cell responses. PD-L1, the major PD-1 ligand, is expressed on various tumors and is being investigated as a possible predictive