Gene Expression in Colon Cancer (IMAGE) University of Pennsylvania Caption β-catenin (green) and MSI1 (red) are differently expressed in tumors (left portion of each panel) compared to normal tissue. While the APC-Wnt-β-catenin pathway has long been implicated in colon cancer, the new study shows that MSI1 and its relative MSI2 are part of a separate pathway that is also necessary and sufficient to drive colon cancer. Credit University of Pennsylvania Usage Restrictions In context of reporting 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.