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JOURNAL ARTICLE

Use of Endocrine Therapy for Breast Cancer Risk Reduction: ASCO Clinical Practice Guideline Update

Kala Visvanathan, Carol J Fabian, Elissa Bantug, Abenaa M Brewster, Nancy E Davidson, Andrea DeCensi, Justin D Floyd, Judy E Garber, Erin W Hofstatter, Seema A Khan, Maria C Katapodi, Sandhya Pruthi, Rachal Raab, Carolyn D Runowicz, Mark R Somerfield
Journal of Clinical Oncology: Official Journal of the American Society of Clinical Oncology 2019 September 3, : JCO1901472
31479306

PURPOSE: To update the ASCO guideline on pharmacologic interventions for breast cancer risk reduction and provide guidance on clinical issues that arise when deciding to use endocrine therapy for breast cancer risk reduction.

METHODS: An Expert Panel conducted targeted systematic literature reviews to identify new studies.

RESULTS: A randomized clinical trial that evaluated the use of anastrozole for reduction of estrogen receptor-positive breast cancers in postmenopausal women at increased risk of developing breast cancer provided the predominant basis for the update.

UPDATED RECOMMENDATIONS: In postmenopausal women at increased risk, the choice of endocrine therapy now includes anastrozole (1 mg/day) in addition to exemestane (25 mg/day), raloxifene (60 mg/day), or tamoxifen (20 mg/day). The decision regarding choice of endocrine therapy should take into consideration age, baseline comorbidities, and adverse effect profiles. Clinicians should not prescribe anastrozole, exemestane, or raloxifene for breast cancer risk reduction to premenopausal women. Tamoxifen 20 mg/day for 5 years is still considered standard of care for risk reduction in premenopausal women who are at least 35 years old and have completed childbearing. Data on low-dose tamoxifen as an alternative to the standard dose for both pre- and postmenopausal women with intraepithelial neoplasia are discussed in the Clinical Considerations section of this article. Additional information is available at www.asco.org/breast-cancer-guidelines.

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