Personally I say never rule out a recurrence, cause quite honestly it can happen! 3 years after my original diagnosis I found out I had cancer again - and this was after a mastectomy and chemo. I wish I had been offered radiation then as it would have likely avoided this. Radiaition is a localized treatment to prevent recurrence. Chemo is a systematic treatment to kill of rouge cancer cells.
When I wnet through radiation this summer I thought I would despise it. I did get a little fatigued. I did get slightly burned. I swear it caused a huge increase in the number of gray hairs I now have. But it has made me more confident that I will not be going back down this road in another 3 years.
You have to do what is right for you and only you can decide. Inform yourself and make an educated decision.
Good luck!
Angi