Theranostic barcoded nanoparticles for personalized cancer medicine. Here, we packed miniscule quantities of anticancer drugs inside dedicated nanoparticles they developed. The unique design of the drug-loaded, nanoscale packages allows them to flow in the bloodstream to the tumor, where they are swallowed by the cancer cells. Synthetic DNA sequences attached to the anticancer drugs in advance serve as barcode readers of each drug’s activity in the cancer cells. “The medical