Some embodiments of the methods and compositions provided herein relate to chimeric proteins comprising a programmed cell death protein 1 (PD 1) extracellular domain and an intracellular immunostimulatory domain. Some embodiments include a cell containing a PD 1 chimeric polypeptide and a chimeric antigen receptor (CAR). In some embodiments, the CAR comprises a ligand binding domain capable of specifically binding to a target antigen on a solid tumor. More embodiments relate to therapies to treat, inhibit or ameliorate certain disorders, such as a cancer, such as a solid tumor.