Hi JayMot,
Your nervousness is certainly understandable and has been felt by all of us. I'm a stat guy myself, and I find that knowledge relieves my anxiety, as does my practice of Mindfulness.
I'll try to address your questions.
The gross incidence/mortality numbers - I'm afraid that doesn't tell you much. Prostate cancer is never fatal for a lot of men, which may be because they did not have a virulent strain, or because treatments cured them, or because treatments allowed them to survive long enough that something else killed them first. It has a very long natural history, so detection of PC now, may result in a death 20 or more years later.
Can you be cured? - Probably so. You have what NCCN calls "unfavorable intermediate risk" prostate cancer. So your chances of a recurrence after treatment is better than the high risk guys but worse than "favorable intermediate risk" or low risk guys. The probability of remaining free of a biochemical recurrence within 5 years of treatment ranges from 60% to more than 90% (depending on the therapy and the institution), so odds are in your favor. The success depends on how well contained the cancer is. Your doctor may want you to have a bone scan and CT to assure that there are no distant metastases.
The reason that most studies report "biochemical" recurrence (meaning PSA rises significantly) rather than prostate cancer survival is because it takes way too long to determine the length of survival. At your risk level, the odds of surviving more than 20 years with treatment is probably over 99%. You can check your predicted stats on
this nomogram.
Surgery.
Johns Hopkins reports 5-year recurrence-free progression probability of 63% after surgery for men with Gleason 4+3. (and about
50% after 10 years.) This is because Gleason pattern 4 (unlike pattern 3) can escape the prostate and seed into surrounding tissues or metastasize distantly. If you're lucky, it is still completely contained and surgery is curative without further treatment. Sometimes they do adjuvant or salvage radiation, but that significantly raises the complication rate.
Radiation. A recent study (
see this link) observed unfavorable intermediate risk men who were mostly treated with a combination of external beam radiation with a brachytherapy boost (some had ADT as well). After 15 years, 93% remained free of biochemical progression. This is because radiation treats areas outside of the prostate as well. This kind of combination therapy has been found to be the most effective. Similar results have been reported for both kinds of brachytherapy (high dose rate and low dose rate) given as a boost therapy and for SBRT. The key is a high dose to the prostate and wide margins, with excellent image guidance to limit toxicity.
It falls to you to get out there and talk to doctors who are specialists in each kind of therapy. If you care to say where you are, we can probably make some recommendations.