Normal Cells and Cancer Cells Interact (IMAGE) Cold Spring Harbor Laboratory Caption Normal cells in a tumor and in its local environment exchange signals with cancerous cells in the tumor. This image shows the intermingling within a breast cancer tumor of a class of normal cells called fibroblasts (green) and cancer cells (red). Credit Cold Spring Harbor Laboratory; Egeblad lab 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.