What happens if a woman had to have her breast removed, due to breast cancer, could she keep her nipple?

It may be: possible, but best to discuss this with your breast surgeon.

In some cases: some women can have a skin and nipple sparing mastectomy. It depends on the size, stage & location of the breast cancer. It also requires a very knowledgeable surgical team with a breast cancer surgeon & a plastic surgeon working together.

Poosible: Depends if it can be saved and used. Discuss with the surgeon who is in the best position to answer this question.