MicroRNA Helps Cancer Evade Immune System (IMAGE) Salk Institute Caption Salk researchers discover how oxygen-deprived tumors survive body's immune response. Here, visible regions of hypoxia in tumor samples correlate with cell signaling linked to suppressing the immune system. Credit Salk Institute Usage Restrictions with credit and related coverage. 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.