Checkpoint Inhibitor in the Bloodstream (image) Netherlands Cancer Institute Share Print E-Mail Caption Checkpoint inhibitors (blue) and T-cells (brown) in the bloodstream. Immunotherapy with checkpoint inhibitors is currently used by patients with for example melanoma, lung cancer and renal cancer. Credit The Netherlands Cancer Institute Usage Restrictions The image may only be used with appropriate credit Share Print E-Mail 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.