Hi, dear. I have gone through your question. I can understand your concern for your fathers prostate cancer. prostate cancer is having high mortality rate. if you not treat it it will spread to near by orgen and lymphnode as well as bone. ultimately wide spread metastasis occurs and leads to death. however it all depends on gleasons score, stage and grade of cancer that how much time it takes for wide spread metastsis. you should consult doctor and also convience your father to take treatment for that. consult your doctor and take treatment according to stage of your cancer. Hope I have answered your question, if you have any doubts you can ask me further. I will be happy to answer you. Thanks for using health care magic. Wish you a very good health.