Hi Yuki,
So sorry to hear about your partner. I hope if he has decided to receive treatment that it was successful and you are both doing well. If not, there is no need to worry about you "catching" it from him. Prostate cancer is not the same as a cold or STD. Because cancer isn't a bacterial or viral infection, it does not spread between two people. Your own body can develop cancer, but he will not give it to you.
If he hasn't received treatment, I would highly suggest looking into other oncologists as well as treatment options like HIFU. HIFU treatment can be a solution for men who are searching for a minimally invasive treatment that offers quick recovery and a life that is potentially cancer free. I'm currently researching treatments for a friend who has prostate cancer, and I've learned a lot about how HIFU works and why it can be the ideal treatment for certain men: http://www.****.com/what-is-hifu/what-is-sonablate-hifu.html. Good luck and take care!
hi Yuki and sorry your going through this. I was treated for this myself with radiation and am doing fine. Stage 3 is not the the issue as means its as spread just a bit outside the prostate. Whats important is the gleason score, which defines the agressiveness of the cancer and the psa score. You should talk to his doctor about why they are not treating it. If the gleason score is low, some doctors prefer to "watch and wait" but i would consult another cancer doctor and the more information the better about treatments.
and NO he cannot pass the cancer to you as is DNA specific.