This book summarizes emerging drug delivery strategies and new technologies for cancer treatment from the perspective of cancer pathology, including immunotherapy strategies, biomimetic drug delivery strategies, live cell drug delivery strategies, nanocrystal technology and 3D Printing technology, etc. With the development of related fields such as pharmaceutical science, materials science and nanomedicine, drug delivery systems have made significant progress in the treatment of cancer. With the in-depth study of different types of drug delivery systems, clinical transformation will be necessary. Some clinical trials have proved the obvious advantages of drug delivery vehicles in anti-cancer treatment. However, the characterization of nanomaterials, safety issues and production issues limit the application. Importantly, accurate in vitro and in vivo models are needed to predict the therapeutic effect of drug delivery systems in the clinic. The drug delivery system has been continuously innovated and improved in cancer treatment, and has broad application prospects.