Been reading a lot of medical journals lately and there have been not one or two, but several authors agreeing that there are cancer stem cells. These cells are pratically immortal and have no effects when treated with chemotherapeutic agents. In fact, as one of the authors suggested, they undergo further mutations when they come in contant with chemo drugs.
I guess then that chemotherapeutic agents are only good against the cancer cells but useless on cancer stem cells. We must be able to come up with substances that are able to revert these stem cells back to normal.