D1N1c cells-what is this?

[sarah]

Hello,
I'm part of a cancer support group for English speakers here in France and a new member with bc mentioned that she has D1N1c cells and that she was told that was pre-cancerous but that she should have a double mastectomy!!!! Since I have no ideas what D1N1c means, I'm hoping one of you may be able to enlighten me.
I told her to get a second opinion.
She didn't mention anything else such as HER2 or inflammatory or....
Many thanks and I am sorry if this is not a topic for this website but since you are my "family" I hope you will excuse me if it's "inappropriate" since I am trying to help others with cancer not all of which are HER2 positive.
health and happiness
hugs and love
sarah