Book excerpt: Biotechnology in the Modern Medicinal System: Advances in Gene Therapy, Immunotherapy, and Targeted Drug Delivery presents an informative picture of the state-of-the-art research and development of actionable knowledge in medical biotechnology, specifically involving gene therapy, immunotherapy, and targeted drug delivery systems. The book includes novel approaches for therapy of various ailments and the real-world challenges and complexities of the current drug delivery methodologies and techniques. The volume helps to bridge the gap between academic research and real-time clinical applications and the needs of medical biotechnology methods. This edited book also provides a detailed application of medical biotechnology in drug discovery and the treatment of various deadly diseases. Chapters discuss targeted drug delivery to specific sites to avoid possible entry to non-targeted sites, minimizing adverse effects. The volume provides information about the roles of alternative routes of drug targeting, like intranasal and transdermal, resulting in improving patient compliance. Targeted drug delivery is explored for several health issues, such as neurodegenerative disorders, cancer, malaria, and hemoglobin disorders. Also considered is the role of genes in various genetic diseases and gene therapy, and immunogene therapy as alternative approaches to conventional cancer therapy. Finally, the book investigates the important role of computers in biotechnology to accelerate research and development in the modern medicinal field for better and optimum results. Studies show that significant improvement has been observed in the development of a faster and less invasive diagnostic system for the treatment of diseases by utilizing both artificial intelligence (AI) and biotechnology. This valuable volume provides a wealth of information that will be valuable to scientists and researchers, faculty, and students.