This book aims to present the latest research on drug delivery systems. It summarizes emerging drug delivery strategies and new technologies for cancer treatment, viewed through the lens of cancer pathology. Topics include immunotherapy strategies, biomimetic drug delivery strategies, live cell drug delivery strategies, nanocrystal technology, and 3D printing technology. The book is intended for researchers, R&D engineers, and graduate students in the pharmaceutical field. Additionally, it is expected to inspire collaboration among experts from different disciplines to advance the development of drug delivery systems.