Epithelial ovarian cancer has a high mortality rate even among those who obtain complete remission after surgery and chemotherapy. In prostate cancer, hormonal therapies including androgen ablation may control the disease for variable lengths of time but progression will invariably occur. There is also a high rate of relapse in breast cancer patients who have four or more positive axillary lymph nodes and in cases of resected metastatic disease. Immune therapies such as therapeutic vaccination may prolong remissions in these cancers.