@frank1956 from online:
"pT1b: Tumor >0.5 cm but ≤1.0 cm in greatest dimension "

It is important to know the percentage or scores for estrogen and progesterone. Higher percentages are good and anti-estrogen meds will of course work well if ER score is high.

Ductal or lobular, LCIS? No DCIS I see. Good there is no lymphovascular invasion.

Can you see the breakdown of the grade assignation? ki67% is a measure of proliferation so wondering how that higher score goes with grade 2.

I had a 20% ki67 (I speculated this was possibly due to cells growing after biopsy), grade 3, lymphovascular invasion (focal) and had a positive HER2, then equivocal, then negative and had it retested.

I had a double mastectomy, no radiation as a result. The Oncotype Dx test, which your wife will have, often guides treatment. Surprisingly, mine was low with a score of 8 which meant no benefit from chemo. I did hormonal meds for 5 years (letrozole).

ki67% is included in the Oncotype along with other measures of proliferation. As you can see, grade does not predict treatment anymore!

Once your wife has a plan it will just be one foot in front of the other and she will get it done. I am ten years out and doing fine despite my seemingly awful pathology.