Women with AH had a highly significant 86 % breast cancer risk reduction (RR 0.14; 95 % CI 0.03–0.47), whereas women with LCIS, due to the small sample size, had a nonstatistically significant reduction of 56 % (RR 0.44; 95 % CI 0.16–1.06). 30 Women under the age of 50 years obtained comparable breast cancer risk reduction to women 50 years of age and older.
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