HER2+ Tumor (IMAGE) Johns Hopkins Medicine Caption Histology image of HER2+ tumor showing accumulation of Herceptin-labeled nanoparticle (upper right, and blue in histology) accumulation in tumor microenvironment (immune) and not on HER2+ cancer cells. Credit Robert Ivkov, Ph.D. 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.