While the study referenced is new, the news tying sugar metabolism to cancer is old. Some physicians noticed decades ago that diabetic patients who took metformin rerely got cancer: those with cancers got better from taking metformin.
Studies were initiated circa 2002 and show that metformin inhibits cancer (even existing cancer) and extends lifespan like nothing else.
"The Drug Virtually Everyone Should Ask their Doctor About":
https://www.lifeextension.com/magazine/2010/11/The-Drug-Virt...
"FORGET THE BLOOD OF TEENS. THIS PILL PROMISES TO EXTEND LIFE FOR A NICKEL A POP":
https://www.wired.com/story/this-pill-promises-to-extend-lif...