let-7 miRNA and Reduced Lung Tumor Load (IMAGE) Yale University Caption Mice treated with let-7 show substantially reduced lung tumor load. Sections from lungs of mice with tumors that were untreated (c, d) or treated (a, b) with intranasal dosing of let-7 miRNA. Points indicate tumor mass. Credit Kerscher-Slack/Yale Usage Restrictions with credit given License Licensed content 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.