Key points from article :
Rutgers University has devised a new method for detecting tiny cancerous tumours.
Subjects injected with nanoparticles that emit short-wave infrared light.
Nanoparticles are designed to stick to specific cancer cells.
In mouse experiments the particles tracked breast cancer cells as they metastasised.
Technology could be available in less than five years.
The study was published in the journal Nature Biomedical Engineering.
