Google
A type of treatment in which a patient's T cells (a type of immune system cell) are changed in the laboratory so they will attack cancer cells. T cells are taken from a patient's blood. ...
CAR T-cell therapy is being studied in the treatment of some types of cancer. Also called chimeric antigen receptor T-cell therapy.
It all sounds VERY iffy, temporary and "maybe."
No. I know people who work on cancer and have seen clinical presentations by MSs on it. They take out certain immune cells, train them to look for the patient’s own cancer cells, then inject a truckload of them back into the patient.
Like giving a bloodhound an article of clothing to sniff...