I'm skeptical that this could really work, but imagine the breakthroughs that would be ushered in for both medicine and space travel if it turned out that zero gravity diminished cancer? It would be the best incentive by far humans have ever had to develop space travel. And curing cancer at the same time! Billions of dollars of research funds could be redirected for developing rockets and we'd saving more lives than before! A wonderful narrative to a science fiction eutopia at least :)