Electric fields to kill cancer cells

Hello,

I am not sure if it has been posted before, but i have found a video presentation about a new device which manages to kill cancer cells without damaging "normal" cells.

From my understanding it uses electric fields with specific frequencies depending on the part of the body where the cancer cells are or depending on the kind of cancer cells, either to disturb the division of cancer cells so that they are destroyed by themselves or they can be damaged/killed by the cells of our immune system.

See :
http://www.youtube.com/watch?v=td5Ld3nURAI

http://www.youtube.com/watch?v=rD3Gdkhzj9s


I think it is really promising tech.