The portable FLARE (Fluorescence-Assisted Resection and Exploration) system uses near-infrared light to highlight cancer cells, giving surgeons a "paint-by-numbers" guide that shows the full extent of a tumor. Before surgery, patients are injected with special dyes called NIR fluorophores that target certain cell or tumor types and glow when they are exposed to near-infrared light. (Don't worry, your prostate won't glow orange -- this process is invisible to the naked eye). A detector relays the information to a video monitor, where the glowing cancer cells are overlaid on real-time images of the patient's body. A footswitch allows the surgeon to magnify or change viewing angles during the operation. More advanced versions may allow the surgeon to simultaneously view other systems, like nerves and blood vessels.