I am not sure about the details of the procedure.
I heard a presentation on AM radio about it. They found that certain mice couldn't be infected with the cancer virus's. They had an immunity to all of them. The white blood cells from the immuned mice would then be injected into other mice and then they couldn't be infected.
It sounded very credible to me. Of course, I am not a doctor or have no training in the medical feild.
BREEZE