Breast Tumor (IMAGE) University of California - San Diego Caption In stiffness levels similar to breast cancer (right), cells are better able to invade surrounding tissue and metastasize. Credit UC San Diego School of Medicine Usage Restrictions Use photo credit as indicated. 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.