Graph (IMAGE) University of Zurich Caption Breast tumors are complex ecosystems. The image shows an invasive breast cancer consisting of many different tumor cell types (irregularly shaped mosaic stones) surrounded and infiltrated by many immune cells (colored circles). Credit Johanna Wagner / UZH) 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.