Use your intuition. Like I said, all disease organisms prefer much lower oxygen saturations than what your cells function best at. Their primitive, fragile membranes break down at concentrations a healthy human cell merely finds invigorating. Get enough and it protects you from disease. Otto Warburg won a Nobel Prize back in the 1930s for pointing that out, but your medical establishment has ignored the principle since then.
Cancer cells get energy from glucose by fermentation instead of by oxidizing it like normal cells.
This wastes so much energy that the healthy cells can't get enough to function and the cancer squeezes them out, unless you intervene by raising the oxygen level one way or another. It is, it's just unpublicized. But the way of modern science is to disregard any facts that don't fit the accepted lucrative theory. And disease is a multibillion-dollar industry, in case you hadn't noticed. It's nascent ozone, in a magnesium oxide powder.