DPP4 Inhibition Blocks Tumor Growth (IMAGE) Institut Pasteur Caption Histological section of two mouse melanomas -- (a) untreated and (b) treated with sitagliptin, a specific DPP4 inhibitor. Stain: hematoxylin and eosin; scale bar: 500 mm. Credit Institut Pasteur Usage Restrictions Please mention the Institut Pasteur credit. 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.