I am sorry to hear about your Dad, Lori. Both of my Granddads died from advanced prostate cancer. Both lived for 24 and 36 months.
I met a guy at my naturopathic oncologist's office who was diagnosed with stage IV prostate cancer and was told he had only a few months to live. It had spread to several parts of his body, including liver and bones. Not only did he outlive that prediction by 2 years already but there are no tumors detectable by the PETscan anymore. He didn't break anything though.
I am not a big believer in chemotherapy and radiation due to the more than dismal performance if you look behind the media hype and look at actual research but he initially did 6 rounds of chemotherapy, totally changed his diet and has been on several different supplements, including Modified Citrus Pectin which in several trials has shown to slow the growth of prostate cancer
http://www.medicalnewstoday.com/articles/82455.php
http://www.mskcc.org/mskcc/html/69327.cfm
Don't expect that your Dad's conventional oncologist will know about this, let alone recommend it. From my own experience I can tell you that information travels slowly to oncologists' offices, particulary when it comes to treatments outside of chemo and radiation. Some large cancer centers may be the exception to that.
I don't think there are any guarantees but also no certainties when it comes to cancer, no matter what stage, no matter if conventional or alternative medicine.
The only advice I can give you, become an informed / empowered patient, don't take everything that the doctor tells you at face value and become an advocate for your Dad, because speaking from my experience if the patient or their loved ones don't, no one else will.
Books that I would highly recommend are
- Cancer Step Outside the Box by Ty Bollinger
- Alternative Medicine Magazine's Definite Guide to Cancer by Lise Aschuler (Dr. Aschuler was a doctor for Cancer Treatment Centers of America and is now a partner at my oncologist's office although she is not treating me)
- Comprehensive Cancer Care: Integrating Complementary, Alternative and Conventional Therapies by James Gordon
Sending you and your family much love and comfort!