The document discusses the origins and characteristics of ovarian cancer. It states that ovarian cancers are mostly derived from epithelial cells, making up 65-70% of malignant ovarian tumors. Germ cells and sex cord-stromal cells account for the remaining cases. Risk factors for ovarian cancer include age, family history, inherited gene mutations, obesity, never being pregnant, hormone replacement therapy, talcum powder use, and smoking. Early symptoms can include pelvic pain or pressure, pain during sex, nausea, vomiting, abdominal bloating, and feeling full quickly when eating. As the cancer progresses it can metastasize to other organs like the lungs and liver.