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Ovarian cancer is cancer that begins in the cells that constitute the ovaries, including surface epithelial cells, germ cells, and the sex cord-stromal cells. Cancer cells that metastasize from other organ sites to the ovary (most commonly breast or colon cancers) are not then considered ovarian cancer. According to the American Cancer Society, ovarian cancer accounts for 4 percent of all cancers among women and ranks fifth as a cause of their deaths from cancer. The American Cancer Society statistics for ovarian cancer estimate that there will be 25,400 new cases and 14,300 deaths in 2003. The death rate for this disease has not changed much in the last 50 years. Unfortunately, almost 70 percent of women with the common epithelial ovarian cancer are not diagnosed until the disease is advanced in stage -- i.e., has spread to the upper abdomen (stage III) or beyond (stage IV). The 5-year survival rate for these women is only 15 to 20 percent, whereas the 5-year survival rate for stage I disease patients approaches 90 percent and for stage II disease patients approaches 70 percent. Ovarian tumors are named according to the type of cells the tumor started from and whether the tumor is benign or cancerous. The three main types of ovarian tumors are: Epithelial Tumors, Germ Cell Tumors and Stromal Tumors. This new book brings together new and leading-edge research from around the world.