There were an estimated 1.5 million new cases of cancer in the U.S. in 2008, according to the American Cancer Society. In addition to surgery and radiation treatments, anti-cancer drugs are an important part of fighting cancer. Also referred to as chemotherapy, cancer treatment drugs work by killing or slowing the growth of cancer cells. Because cancer takes a wide variety of forms, many different drugs are used to treat it, and some are designed to combat specific cancer types. This book explains how cancer drugs work and looks at the ongoing effort to develop new and better anti-cancer drugs.