Hi, Stage 4 prostate cancer is typically considered advanced and difficult to cure completely. At this stage, cancer has spread to distant parts of the body, such as the bones or other organs. However, there are treatments available to manage cancer and improve the quality of life. While it is important to maintain a healthy diet and lifestyle, it is unlikely that diet alone can cure stage 4 prostate cancer. Chemotherapy and targeted cancer-fighting drugs may be effective in controlling the growth and spread of cancer, but they are typically used to slow the progression of the disease and manage symptoms rather than to cure it completely. It is important to note that every case of cancer is unique, and response to treatment varies from person to person. It is not possible to predict with certainty whether any individual will be cured of stage 4 prostate cancer. It is important to have open and honest communication with your brother s medical team and to stay informed about his treatment options and prognosis. If you require a personalized response, kindly use the Ask A Doctor service and post a follow-up. Take care. Hope I have answered your question. Regards, Dr. Priyanka, General & Family Physician