A remarkable increase in knowledge of microscopic study of brain tumors has been witnessed in the recent times. Detailed information about the reaction of tumors to chemotherapy and radiation therapy has been provided. Tumors, which are a challenge to humankind, can be combated with these new effectual regimen methods. This book provides an insight into up-to-date information related to prior mentioned topics and latest information about a lot of new therapeutic treatments, while laying an emphasis on molecular targeted therapies.