Hi,
I was in a similar position, grade 2, just the sentinel node positive, strongly ER positive, age 50. My oncologist said chemo would increase my 10 year survival by around 1-2%. Taking tamoxifen made a much bigger difference. I opted not to have chemo, had rads and am taking the tam.
it is a very personal decision, for me I felt the side effects of chemo outweighed the potential benefits, but I can understand the other viewpoint as well. I am 18 months down the line and clear so far, but I have had the occasional doubt. When I do I revisit my decision in my mind, and know I would make the same choice again.
whatever you decide the most important thing is that it is your decision, and you will have to accept and live with it.