summary (IMAGE) UT Southwestern Medical Center Caption Neuroendocrine tumors, including small cell lung cancer, are not highly visible to immune cells due to a lack of surface proteins called NKG2DL. A UT Southwestern study found that HDAC inhibitor drugs allow these proteins to be produced, causing tumor cells to be recognized and targeted by immune cells. Credit UT Southwestern Medical Center 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.