Hi Kilo
I weighed up RT omission for a different reason and chose not to go ahead with it. I had early breast cancer it was a slow growing 5mm mass and calcifications. My surgeon got good clearance with both after a lumpectomy. My oncologist recommended I take Anastrazole for 5 years and I am doing that. My Radiation technician told me I had 90 % chance of no return without radiotherapy and 96% chance of no return with radiotherapy. He also said there was a study done on early stage, low risk, oestrogen positive, slow growing cancers which says you can omit radiotherapy in patients over 65 in the USA and UK I think, I was in this category but, In Australia you must be over 70 from memory. I was already concerned about possible side effects of RT on my heart and lung. So having that information I felt comfortable choosing no radiotherapy. My surgeon said I made a reasonable decision.
Do talk to your specialists again and see what they recommend, they are all there for you to get your best outcome. I hope all goes well.