Your comment was that you had heard that she has Breast Cancer.
Agree with @primek unless she shares that information with you it is not for discussion about her condition.
She is there, at this appointment, in her professional capacity and there for you.
Concentrate on yourself and perhaps look at her with admiration in that she is able to put her diagnosis to one side to concentrate on you and her other patients. Try and hone in on what the appointment is about, you and why you are there, she is there to help you
Take care of yourself
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