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Breast cancer incidence among BRCA mutation carriers by hormone replacement therapy (HRT) use. (A) Breast cancer incidence among BRCA mutation carriers who used any HRT compared with women who did not use HRT. (B) Breast cancer incidence among BRCA mutation carriers under the age of 45, who used any HRT compared with women who did not use HRT. (C) Breast cancer incidence among BRCA mutation carriers over the age of 45 who used any HRT compared with women who did not use HRT.
