Tumors (image) Salk Institute Share Print E-Mail Caption Salk scientists found that the diabetes drug phenformin was effective at reducing tumor size in mice with lung cancer. The image on the left shows tumors (dark purple) treated with a placebo (left) compared to those treated with phenformin (right). Credit Photos: Courtesy of the Salk Institute for Biological Studies Usage Restrictions News media reproduction to illustrate this story permitted with proper attribution as provided above. For one time use only. Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.