Gene Therapy Destroys Cancer

scientists successfully destroy cancer with gene therapy <- link to article

I thought this was an amazing idea and am glad to see that it has worked so far.
Apparently, these researchers modified the white blood cells to attack cancer cells to such a degree that it can actually cause a tumor lysis syndrome, where your body is affected by losing too many cancer cells at one time.

Gene therapy has had a few mishaps in the past, but this looks like a very interesting theory and I really want to see how this goes from here.