Cancer Cells (IMAGE) Johns Hopkins Medicine Caption The research teams discovered new infiltration of immune cells into the lung cancer after nivolumab, an anti-PD-1 drug, was administered. Credit Johns Hopkins Kimmel Cancer 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.