WELL, GOOD: 5-Cent Diabetes Pill From 1958 May Be New Cancer Drug. “Metformin, the most commonly used medicine to lower blood- sugar, is the subject of about 50 cancer studies globally, according to U.S. government clinical trial information compiled by Bloomberg. The research began after scientists found metformin prevented tumors in mice and that diabetics were less likely to develop a malignancy if they were taking the 5 cents- a-day pill than other diabetes medications.”