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