Patients in this study will take Mifepristone in the form of a pill by mouth every day. Each course of therapy is 4 weeks long. Patients will see their doctor for an exam and blood tests before they begin each 4 week course of therapy. The dose of Mifepristone may be lowered if the patient has side effects. Patients who have a complete response (there is no evidence of cancer by physical exam or x-ray) will continue taking Mifepristone for 2 years after this response is documented. Other patients will take Mifepristone for as long as it benefits them.