This won't affect your insurance - the patient population is too small.
Now, if a similar treatment gets approved for, say, prostate cancer... that's going to affect your insurance.
Now, if a similar treatment gets approved for, say, prostate cancer... that's going to affect your insurance.
Now, if there was a gene therapy for breast, colon or liver cancer, then it would be a problem.
In the UK we have NICE (National Institute for Clinical Excellence) who make the decision over what drugs can be used on the NHS (and most private insurers use the same gradings), if it doesn't offer a clear benefit over the existing treatment in both effectiveness and then cost it won't be approved.
I think that cancer is one of the great filters. At some point a species will develop an unreliable way to treat cancer (chemotherapy); at which point cancer becomes a genetic problem as natural selection is displaced by medicine. Over many generations, this will kill a species unless a reliable cure is found - we seem to have that cure. Our cure is symptomatic (cancer being the symptom) but the same technology could eventually be used for designer genetics.
Essentially, more and more people are going to rely on this treatment until we are able to completely eradicate hereditary cancer. Probably not in our lifetimes.
Evolution does not and never has selected /for/ things. It is a process of elimination. What this means is that, since the advent of chemotherapy, we have eliminated selection /against/ certain types of cancer.
> the majority of them emerge well after the onset of reproductive ability
Correct, we have never had an impact on that and likely won't for a very long time (we don't know enough about our genome to do so). As-per this study, we have been curing cancer in children (as we absolutely should) with very little knowledge as to how/why they developed cancer so young. Will their children also be at risk for leukemia? What about their millions of descendants? We don't know. If treatments like this work out then we might not have to care.
Furthermore, eradicating hereditary cancer (and many other diseases) is technologically possible already (screening of embryos, genetic testing of parents) but it's socially and politically complex; we as a society currently don't want to e.g. enforce restrictions on procreation just to prevent these diseases.