Statistically likely, not guaranteed. I'm already statistically likely to be dead and resistant to chemo but so far so good. The patients know the risk though and decades is dramatically longer a time frame than they likely have. Hopefully this works wonders and can be pushed to other types of cancers.

I'm sort of glad we've changed our approach. Back in the early days of gene therapy in the 90s in one of the first attempts at curing OTC[1] the medical ethics board decided that the trial could only be conducted on people with a non-lethal version of the disease. It was thought that people whose only alternative to the treatment was death wouldn't be able to say no and thus couldn't give the required consent.

[1]https://en.wikipedia.org/wiki/Ornithine_transcarbamylase_def...