One more thought…I’m 67. Certainly comfortable with no breasts and occasional use of prosthesis, so I’d go flat.

@grannyb I had a ki67% of 19, just over the line in 2015 (yours isn't too high). Here is an article on ki67% https://pmc.ncbi.nlm.nih.gov/articles/PMC8487652/ In 2015 my doctors considered it unreliable so some hospital had it, some didn't.

I was also ER+ PR+ HER2- and grade 3 with lymphovascular invasion. BUT a low Oncotype. Even with grade 3 and those other factors. The Oncotype is a test done with your pathology (sometimes with biopsy, preferably after surgery) and includes the ki67% and some other proliferation factors. You can still do an Oncotype with 1-3 lymph nodes positive.

The Oncotype tells you whether you would benefit from chemo and also gives risk with and without aromatase inhibitors.

This is all just fyi. As to your original question, it is a personal choice. Every doctor tells us the risk is the same with either lumpectomy or mastectomy.

I chose two mastectomies (doctors wanted me to try one first due to lupus, to see how I handled it) and wetn flat. I don't actually wear prostheses but lots of people do. The mastectomy on the non-cancer breast showed a lot of cysts but also atypical dysplasia (Possibly pre-cancerous) so I was glad I did it. But plenty of women have lumpectomies and do fine!

I was like you- I didn't want one gone. I was told I had a legal right to symmetry!!

I don’t want to talk you out of a mastectomy but there is another option to consider than just a lumpectomy on one side.
I was a 34DD, 68 yr old. I had right side non-invasive DCIS so my decision was a little different. However, I asked for a lumpectomy with oconoplastic surgery to reshape the right breast, with surgery on the left breast for symmetry.
The law that says they must provide an option for symmetry has no consequence if they don’t do it. So it is more like a guideline. But it sounds like most facilities will do surgery to make both breasts similar.
When the plastic surgeon discussed what was going to be done during the pre-op appointment, I said I’d prefer the end result to be smaller breasts as I’ve never been comfortable with large breasts.
My surgery was listed as a lumpectomy with oconoplastic surgery and mastoplexy on right, and a mastoplexy on left for symmetry. I am now about a C+ cup on each side. I did have 5 days of radiation. It was 30 Gy in 5 hypofractionation to partial breast. With invasive cancer, whole breast hypofractionation is more often done I think. I am on tamoxifen for minimum 5 years.
I don’t know which option is best for you, but just wanted you to know that a breast reduction on both sides might be possible.

@triciaot Rubyslippers brings up another point. My doctors didn't want me to have radiation and I didn't want it either. I was told one in five radiologists would have wanted me to have radiation even with the mastectomy. In general, lumpectomy means radiation and sometimes (often?) mastectomy avoids it.

Greetings,
This year I was diagnosed with invasive dc (er/pr+, her2-) after much research and prayer I chose dmx with Goldilocks procedure and am super pleased with outcome. Here is more info https://www.mayoclinichealthsystem.org/hometown-health/patient-stories/goldilocks-for-breast-reconstruction
This was a nice middle of the road option for me.
Prayers that you find peace in your decision and are surrounded with a loving and supportive team!

I was 60. Similar- I chose a lumpectomy and reconstruction on both. Hormone+ her- grade 1. On left breast DCIS was 4cm, IDC was 1.9 mm…. They couldn’t do a onco test too small. I had 15 days radiation. I am currently on exestamane - anastrozole did not agree with my body. I didnt want a mastectomy. And my surgeon was fine with that. I was a D and now am a C.

Hi. I was diagnosed with a rare triple negative cancer in the left breast end of September 2024. The mri, high compression mammogram and ultrasound showed no signs of cancer in the right breast. After careful thought, I chose a double mastectomy vs a lumpectomy.

Of course, I was sad to lose my original breasts. However:
1) I did not want to worry about cancer showing up in the right breast or reoccurring at all.

2) I wanted a good cosmetic outcome; it matters to me what I look like when I come out of the shower and look in the mirror.

My nipple-sparing bilateral mastectomy was 10/23/2024. In my right breast, they did find “atypical cells” that had not appeared on any of the prior testing. So I am very glad I had the bilateral mastectomy.

I have tissue expanders now and will have another surgery in 2 months to have implants, along with fat grafting from my tummy to even put the breasts.

My breasts already look good! Most importantly, I am cancer free.

The tissue expanders hurt. This is a hard journey. But I know that for me i absolutely made the right choice. I have an excellent care team at a highly rated hospital.

Best of luck to you. Everyone’s choice is personal. (I am 59.)