I found out a couple of days ago. She was my student and years later we became friends (so long ago I can't even remember how we ended up being friends!).
Anyway, she was diagnosed three months ago. That isn't a problem, but when I last saw her just before christmas she kept asking me about my experience (which was very easily treated as it was a lump which was a case of simple removal and no further treatment - I was very lucky).
When she mentioned it to me she said about the (to me) long delay and how she's putting off the double mastectomy she's been told she has no choice but to have so she can have time off work over the summer (she works in a school), recover and be back again ready for September, all fit and heathy and ready to go and is booking a big trip next year 
I did ask if she'd spoken to anyone about this (other than me) and she said yes, she saw a doctor at the hospital two weeks ago who 'zipped' through the options to do with reconstruction. Her oncologist just said 'both must go' and that was it. I asked her about further treatment such are chemo etc and she said the oncologist didn't talk about that at all and just said have the ops.
I'm really concerned as she refuses to acknowledge any further treatment than mastectomy and reconstruction might be needed. She is really determined that's all there is to it and kept repeating my experience to me as if what I went through is some sort of standard treatment for breast cancer - I did keep saying it isn't but she won't accept that.
I was with her for two hours talking about this (her talking, me listening except to ask about treatment) and it felt a lot like when I was her lecturer again helping her with essays, showing me all the reconstruction options and which should she go for etc. She said the only thing she needs to do is 'book' her mastectomy ops and choose which reconstruction and that's it job done 
I'm really concerned. Am I right to be? Mine was a lump and apparently hers isnt - it's a different type which automatically means mastectomy but, she says, that's it.
I guess what I'm asking is for people's experiences. I'm really worried she is totally burying her head in the sand about this and I really want to help her but don't know how
She doesn't have family and doesn't really see anyone apart from me and that isn't very often as we don't live near to each other.
Sorry for the essay, I hope this makes sense! Ill reply as soon as I can as my internet access comes and goes (the joys of mobile internet!)