Yeah, and given that the study was specifically about the metabolic output of the gut bacteria of mice, I am very suspicious of anyone jumping to the conclusion that this has even a decent chance of having any relevance to humans. Overall, of course sugar increases likelihood of cancer. Everything which provides energy to the body is because it might provide that energy to dividing cancerous cells. Anything which increases cellular activity increases the risk of cancer, whether it be heat, friction, calories, whatever. Reducing caloric intake is the only proven reliable means of life extension for a reason. But beyond that basic contribution it would be very hard to see how such basic molecules could contribute significantly.