Cancer is a group of different diseases (more than 100) characterized by uncontrolled growth and spread of abnormal cells. Cancer can arise in many sites and behave differently depending on its organ of origin. If a cancer spreads (metastasizes), the new tumor bears the same name as the original (primary) tumor. Significant progress has been made in recent years in the battle against cancer and in understanding its underlying biological mechanisms. This research progress has resulted in many experimental treatments and cures which establish hope for wide-spread cures. This book presents new and important research from around the world.