First the rumor and the fact that I did not find any supporting evidence for it: Pharmaceutical companies are actively suppressing cures in favor of treatment therapies for economic reasons.
What I found was an August 2011 report on the results of a clinical trail where they used T-cells from the patients' own blood to modify the T-cells' genes so that the T-cells would attack another type cell called a B cell of which the patients's leukemia cancer cells were made up of. There were only three patients and it was a success in that it saved the patients lives, but there were complications. BUT, a better designed cancer cell identification and targeted attack would avoid the complications in this clinical trial. It seems very promising.
The problem I have had this night is that I cannot find any up-to-date articles on the Internet that show that researchers are now getting grants and pursuing this most promising form of gene therapy. Can anyone point me in the right direction?