What factors do you consider when you are deciding whether to recommend endocrine therapy for a woman who has had a mastectomy for DCIS for contralateral breast cancer risk reduction?   

Endocrine therapy after a mastectomy for DCIS is primary prevention, and therefore elective. I present this as an option to decrease contralateral breast cancer risk. I quote that risk as approximately 0.7% chance per year. I generally don't recommend it for older patients or to patients with HR-neg...