Some cancers (testicular if I recall), are the result of a p53 mutation. Crucially, fixing the mutated gene did not fix the cancer. The community I work with ha

Some cancers (testicular if I recall), are the result of a p53 mutation. Crucially, fixing the mutated gene did not fix the cancer. The community I work with has a lot of skepticism about claims that simply increasing the quantity of tumor suppressor gene will fix cancer. Most likely having more genes means that there was a higher chance of receiving a viable beneficial mutation somewhere early in the animals evolutionary history, although it does little for the individual animal in the present day.