Anticancer Cluster Bombs (IMAGE) Emory Health Sciences Caption The particles start out large (100 nm) to enable smooth transport into the tumor through leaky blood vessels. Then, in acidic conditions found close to tumors, the particles discharge bomblets 5 nm in size. Inside tumor cells, a second chemical step activates cisplatin. Credit Jinzhi Du/Wallace H. Coulter Department of Biomedical Engineering at Georgia Tech and Emory Usage Restrictions In connection with PNAS paper only. 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.