Originally Posted by: Online Community MemberDecho
I find it frustrating that your oncologist view is different. I want to believe mine. jeez Louise !!
Can they both be right? I know I have cancer in many nodes I have seen the PET scan so why would he think 20 is okay and yours does not ??
this is where the fear comes from I think
N
N, you will drive yourself round the bend! You seem to be imagining RT as a linear thing - limited PCa with no lymph involvement = 20 fractions, PCa with lymph nodes zapped = 37 fractions. That is just not how it works - if it was like that, we would see men with very small tumours having 10 fractions and a man with a really big prostate having 50! Weirdly, the opposite can be true - a man with advanced PCa may have 1 or 2 sessions just to reduce some bone pain and a man with a T3 / T4 having 5 or 6 fractions at 6Gy!
Some oncos will use 20 fractions at 3Gy / 3.2Gy for all radical RT - some will only use it for men with T1 / T2 but perhaps at a lower dose than 3Gy - some will only use it for adjuvant or salvage RT.
Some oncos will use 37 fractions (or even 39 in Decho's onco's case) at 2Gy for all men - some will use 37 fractions only for men with pelvic node involvement - some don't do 37 fractions at all now (for example, because of changes to procedures since Covid and the drive to reduce the number of visits each patient makes to the hospital)
Some oncos will run 30+ fractions for a man with local spread - 20 or 25 fractions delivered as normal and then a few additional fractions aimed just at the nodes or just at the heaviest load in the prostate.
You are trying to rationalise the random ... oncos have different preferences and NHS trusts may also have developed different approaches. The fact is that 37 x 2Gy (74Gy) delivers more or less the same amount of killer rays as 20 x 3.2Gy or 6 x 6Gy and a personalised computer programme determines how much killer dose is delivered to which bits of the pelvis. Your onco and Decho's onco can therefore both be right!