Hi there ...

The one thing about cancer is , no two are exactly the same .. it's a bit like a game of chess (literally) no two games the same .. l had a grade 3 but didn't need chemo .. others can have grade 1 but need chemo .. the oncology team,  get together , all chat about every patient ... and what they think is the way for them .. 

My untie had the same as me, but had radiotherapy... there's lots of sinarios.. so talk to your mum .. that's a huge operation to go through , as I had a total right masectomy... but ask her if there's any questions .. write them down.. and ask the oncology team next time you go .. sometimes chemo only gives a 3% extra chance of not having it .. but let your mum lead the way .. 

But you sound a wonderful caring daughter .. bet she's really proud of you ...  Chrissie xx

Thank you Chriss for your kind words. I will ask mum if she has any questions before having surgery.

The Predict breast cancer webpage breast.predict.nhs.uk/tool seems to suggest a 2-4% extra chance of living longer (at 5, 10 then 15 years) with chemo + hormone therapy...