Treatment with MAPK Inhibitor Only Kills Some Colon Cancer Cells in Mice (image) Rockefeller University Press Share Print E-Mail Caption Human colon cancer cells injected into mice form tumors (left) consisting of both MAPK-active cells (green) and NOTCH-active cells (red). Treatment with the MAPK inhibitor selumetinib results in tumors consisting of NOTCH-active cells only (center), but after treatment is stopped, the NOTCH-active cells give rise to new MAPK-active cells, restoring the tumors' original composition (right). Credit Schmidt et al., 2018 Usage Restrictions Reporters may freely use these materials in news coverage with the appropriate credit information. 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.