Hi @Frances54 . I had a similar diagnosis to yours - but different because we are all individuals! I had a grade 3 invasive carcinoma. After lumpectomy, clear margins, no nodes, ER+. The medical oncologists were humming and ha-ing about chemo. A young enthusiastic resident desperately wanted me to have chemo. The older senior onc shrugged his shoulders and basically went "meh" might help, might not. I hurtled off to a private medical oncologist of my own choosing for a second opinion. I considered the genetic testing but there was no guarantee that $4000 later, I would get a definitive answer. I could have still landed in the grey area.
After taking all my own personal issues and medical conditions into account, I decided not to have chemo and just had radiation. Not that radiation was a walk in the park!! However, as the oncologist said, whatever decision I make, I have to live with it and not go down the "if only" path if I get a recurrence. And I'm happy with that. I've made my decision, and whatever happens, I'll deal with it at that point. I won't regret not having chemo. But that's just me and my personal circumstance.
Do what works for you after taking in as much information as you can. I think if you make an informed, considered choice based on all the facts, then you are probably in a much better headspace to deal with it rather than feeling like you're just being carried along on a wave out of your control. Best wishes for whatever you decide!!!