Ovarian cancer is diagnosed in 225,000 women every year, accounting for 4% of all cancers. There are not many signs of early stages of cancer and it is often found only in its very late stages, when it is often fatal. Ovarian cancer spontaneously occurs very often in the chicken. Its cause and progression are almost identical to ovarian cancer in women. These similarities make the chicken a vital animal model that can be studied to help in the development of ways to earlier diagnose ovarian cancer, which will save hundreds of thousands of women.