Thank you all for your input, I have appreciated it more than you will know!

So at the end of the day and having nearly done spreadsheets to weight risk/reward. I have decided with my family that protecting my good health from side effects is probably a wiser choice than pursuing treatments that will only give me a tiny gain in preventing a recurrence etc.
I am incredibly lucky that I can make choices but also being in the gray area of making a decision also has it's drawbacks.
Best of health to all!!!