Small interfering RNA molecules (siRNA) are a type of short, double stranded RNA molecule. siRNA molecules are very short, only about 20-25 base pairs long, but they have very potent effects. Molecules of siRNA are able to effectively inhibit the process of DNA replication, and are thus able to stop growth and proliferation of target cells. However, due to the non-specific nature of siRNA molecules, collateral damage to non targeted cells can easily occur. As a result, siRNA therapies are the perfect candidate to be delivered via liposomal transport.