The breast cancer survival expectation?

My dear old mum,who is pushing seventy,has been diagnosed with breast cancer.

How survivable is breast cancer for women her age?
Update: She had her first chemotherapy on Thursday,Doc. Frog. So I guess the sawbones deem it not beyond treatment.
Update 2: Thankfully she's an active and fit woman and we live in Ireland,semi socialised healthcare.
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