At this point I almost expect an article titled "All oxygen-breathing organisms are a fatally flawed design and are doomed to never live healthy no matter what".
I was under the impression that everyone has cancer all the time at about the same rate the body can fight it before it becomes an actual, detectable problem.
On the upside, oxygenation led to the explosive diversity of complex, high-energy organisms that led to us[0]!
Without living on the edge, you don't get complex, powerful organisms (like mighty trilobites).
Plus, there's no telling how much reprogramming for stronger oxidization-repair mechanisms can provide. Mammalian mitochondria are inferior to bird mitochondria (and birds have them in their blood cells unlike us which may help[1]), allowing birds to live longer even with higher metabolisms than mammals. Evolution hasn't exhausted the possible. There's hope!
Just not for us. :) Which is fine; everything's fine.
Interesting; could that be caused by most cities being near sea level and most people living near cities, and thus pollution rather than oxygen might be the root cause?
I don't have a link to the study, but the researchers of the study I read were very meticulous and did discard all other obvious explanations before concluding that altitude was the best explanation.
The SENS people say, if you live long enough, you will eventually have cancer.