T Cells Before and After Treatment (image) Fred Hutchinson Cancer Research Center Caption Red cancer-fighting T cells are rare in tumors rich in immunosuppressive cells (left), but rapidly enter tumors when immunosuppressive cells are removed (right). Credit Hingorani Lab, Fred Hutchinson Cancer Research Center Usage Restrictions Only use in conjunction with information related to this news release. 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.