Nanotechnology and Nanoscience are widely seen as having a great potential to bring benefit to many area of research and application Nano devices are some where 100 to 10000 times smaller human cells. They are similar in size to large biological molecules such as enzymes and receptors. This offers the unprecedented and paradigm changing opportunity to study and interact with normal as well as cancer cells at the molecular and cellular level scales and during the earliest stages of the cancer process. Nanoscale device can readily interact with bimolecules on both the surfaces of cells & inside of cells. Nanogen develops this technology. Nanogens technology utilizes the natural (-ve) or (+ve) charge of most biological molecules.