You just have to watch out for side effects as the immune system is going apesh*t killing the cancer.
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."