Sean Parker and the PD1 receptor

When we talk about the function of a cell its RECEPTOR remains tantamount as the control device. It must be acted upon by its relative hormone or ligand to be effective. That is assuming it is functional in the first place. The PD 1 receptor is involved in Programmed Cell death. It not blocked it promotes tolerance and because of this cancer is tolerated as being recognized as self. see https://goo.gl/0ohkj4 Mr. Parker is now involved in attempting ato research other things that block PD1 . Do you not think that this is a good idea? Alonzo Peters MD