Nanotechnology offers unique approaches to probe and control a variety of biological and medical processes that occur at nanometer length scales and is expected to have a revolutionary impact on biology and medicine. This book introduces new research on intelligent drug delivery systems for cancer therapy. The book covers recent developments in nanoparticulate drug delivery systems (NPDDS). The book then addressess the formulation of aspects covering small molecules, macromolecules, gene delivery, protein-based nanodelivery systems, therapeutic and diagnostic applications of gold nanoparticles, and the application of NPDDS in cancer, diabetes, and dermal and transdermal deliveries.