Head and Neck Cancer under the Microscope (IMAGE) University of Chicago Medical Center Caption The cancer (red and blue) is infiltrated with immune cells (green), which can attack and kill cancer. When cancers hide, medications such as pembrolizumab make the cells visible to the immune system. This can lead to lasting control of the cancer with few side effects. Credit Tanguy Seiwert Laboratory Usage Restrictions None 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.