US Patent 7863258 - Nanoparticle cancer treatment

http://www.freepatentsonline.com/7863258.html

This patent teaches using nanoparticles for anti-cancer drug delivery in which chitosan enhances absorption. Claim 1 reads:

1. A method of treating a cancer in an animal subject comprising

administering nanoparticles consisting of an antineoplastic drug or anti-cancer therapeutic agent in effective amount to treat said cancer, positively charged chitosan, and a negatively charged substrate,

wherein a surface of said nanoparticles is dominated by the positively charged chitosan.