This book provides a collection of ingeniously organized, well-illustrated, and up-to-date authoritative chapters divided into five sections that are clear and easy to understand. Early sections provide a concise and richly illustrated overview of biomarkers by introducing basic terminologies and analyzing how predictive biomarkers are altered, expressed, or amplified across cancer types. Later sections explore how these biomarkers play a role in patient stratification and treatment, ultimately leading up to detailed descriptions of precision medicine clinical trials across the world.