Keytruda and the Immunotherapy Revolution takes readers inside one of the most important breakthroughs in modern medicine - the rise of immunotherapy in the fight against cancer. Written in clear, accessible language, this book explains how science unlocked the power of the body's own defenses and transformed the way doctors treat cancer today. From the basic science of how the immune system works, to the landmark discoveries that brought checkpoint inhibitors like Keytruda into hospitals, this book offers a complete yet easy-to-follow guide. It covers: How Keytruda helps the immune system recognize and attack cancer cells The cancers where Keytruda has changed survival outcomes Real patient stories, clinical successes, and lessons learned from trials The risks, side effects, and safety considerations that every patient and family should know The future of immunotherapy - from new combinations to global accessibility Whether you are a patient, caregiver, student, or simply curious about the future of medicine, this book is designed to inform and inspire. It is not a technical manual but a carefully crafted educational resource - showing how science, hope, and innovation are reshaping the battle against cancer.