This unique book provides a thorough overview of developing molecular cancer diagnostic assays, which are the prerequisites for optimal solutions within personalized cancer medicine. The book takes the reader through definitions of the pharmacodiagnostic concept, historical perspectives of the early steps into molecular cancer diagnostics linked to therapy, the basis of different diagnostic molecular techniques, ongoing research, drug-diagnostic co-development, assay validation, clinical trial methodology, regulatory issues around pharmacodiagnostics and future aspects within personalized cancer medicine.