Breast cancer patients diagnosed under age 50 represent 18 percent of new invasive breast cancer cases in the United States. Compared to postmenopausal women, younger women are more likely to develop aggressive subtypes of breast cancer, have a worse prognosis with increased risk of recurrence, and have higher overall mortality. Young breast cancer patients also are more likely to be diagnosed with triple-negative breast cancer, which is associated with a higher frequency of BRCA1 genetic mutations.
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