Can I assume you're in Spain? If so, some of the expressed ideas based on experiences in the USA may or may not be achievable there--your medical system and how it operates is different.
That being said, with 2 G6 cores, AS is a real option for you. If you don't understand what that is, it's a program of regularly checking for progression of the disease, and IF it starts to do something, then you take action. It's been shown in many studies that for low risk cases like yours, there is NO DIFFERENCE in outcome between treating immediately and doing AS for (in some cases) many years.
You've got a challenge. With your large gland, some of the radiation choices are more challenging (such as LD Brachy), but with the apical tumor, surgery becomes more challenging.
Have you consulted with a radiation oncologist? We say often in here that it's a bad idea to ask a surgeon about
radiation treatment. It's not their specialty and expertise. If you want to know about
what radiation treatments are available and useable in your case, consult with someone who does it for a living.
Age at Diagnosis: 56
RALP on 2/17/15, BJC St. Louis, Dr. Figenshau
58.5g, G3+4, 20%, 4 quadrants involved
PSA 3/10/15: 0.10
My Story: www.healingwell.com/community/default.aspx?f=35&m=3300024