Molly---Prostate cancer is actually an overtreated condition. As someone has already stated, most men die WITH prostate cancer, not OF it. Many healthcare professionals actually recommend a watch and wait period. Depending on his age and type of prostate cancer, he can do a lot on his own with diet and lifestyle changes to slow and even reverse the disease.
The prostate HATES dairy. That's right. Dairy increases the risk of prostate cancer in men, and lowfat/skim products increase that risk even more. Go to www.pcrm.org to learn more about the diary/prostate health connection. You can also learn a lot more about the dangers of too much animal protein for increasing the risk of all degenerative diseases at www.thechinastudy.com.
So a healthful cancer fighting/preventing/surviving diet consists of mostly plant based foods: lots of fruits, veggies, whole grains, legumes/beans and nuts and seeds. Eliminate dairy and minimize if not eliminate animal protein for the best possible outcome. This diet will help his body fight those cancer cells all by itself.
I also recommend a consultation with Dr. Susan Silberstein of CACE, the Center for the Advancement of Cancer Education. She is located in Philadelphia, but she consults all over the world, no charge but a donation is appreciated. She will offer advice on treatment options and complementary support for cancer survival, which includes diet and believe it or not, how attitude and relationships and spiritual beliefs all have an effect on treatment and survival...and most importantly, preventing recurrance. Go to www.beatcancer.org to learn more.
Good luck...and feel free to contact me for more info. I am a Health and Wellness Educator and have lots of resources that may be of help to you and your friend. D.