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I¡¯d hoped that being a non-smoker who breastfed four children and never used hormone replacement therapy might protect me from developing breast cancer. But that disease runs in my family, so I can¡¯t say I was entirely surprised when I received my own diagnosis at age 65.

Because both my mother and her mother had had breast cancer, I¡¯d been vigilant about getting regular mammograms. It was after one of those screenings in late...