Targeted therapy is one of the most burgeoning areas of development in cancer research. Increasing knowledge in tumor formation and growth at the molecular level has generated a broad array of therapeutic options, including signal transduction inhibition, anti-angiogenic and anti-vascular agents, cell cycle inhibitors, telomerase and telomere interacting agents, apoptosis inducers, and anti-invasive agents. This book presents an authoritative overview of existing molecular targeted therapies, their relevance and role for specific tumors, and their clinical efficacy and impact on patient treatment.