All nanoparticles are not made equal. This becomes evident when we consider their motion under blood flow in blood vessels of tumours. Remarkable advances in nanomedicine have generated various classes of nanoparticles with different compositions, shapes and sizes. Increasingly, these structures are becoming important elements in our portfolio against cancer. Key physical characteristics of nanoparticles have important consequences on their ability to deliver the goods to tumours.
http://nanotechweb.org/cws/article/lab/45368