Using this technology,it will be possible to detect cancer at a stage when there are perhaps only a thousand bad cells.Compare this to what happens today:Doctors can diagnose cancer only after the dangerous cells have multiplied into the millions and developed into a tumor.One of the advantages of detecting and treating cancer at an early stage is that the cells are less likely to become resistant to drug treatment.In later stages, cancer cells often change and adapt to certain drugs so rapidly that many medicines become ineffective.