Primarily used in the treatment of prostate cancer, it combines the effects of an estrogen and a nitrogen mustard alkylating agent. This dual action helps to inhibit the growth of cancer cells by disrupting DNA synthesis and exerting hormonal control. It is often prescribed for patients with advanced or metastatic prostate cancer who have not responded adequately to other therapies. The medication is administered orally, making it convenient for long-term management. Additionally, it may be used in combination with other treatments to enhance therapeutic outcomes.