Dynamic Interplay of Oncogenes and T Cells Induces PD-L1 in the Tumor Microenvironment

Tumor-infiltrating T cells have recently been found to upregulate immunosuppressive pathways, such as programmed cell death protein 1 ligand 1 (PD-L1), in a paracrine fashion on tumor cells, but tumor cell-intrinsic regulation of PD-L1 is another potential mechanism. In this issue of Cancer Discovery, Akbay and colleagues show that signaling via mutant EGF receptor (EGFR) in murine lung tumor cells directly upregulates tumor PD-L1 and that therapeutic blockade of this pathway improves survival in EGFR-driven preclinical models-highlighting the dynamic interplay and therapeutic opportunities of cancer cell biology and immune biology. (C) 2013 AACR.