The Risk of Breast Cancer and the Role of Chemoprevention in Women With Atypical Ductal or Lobular Hyperplasia abstract
Background: Women with atypical hyperplasia are about 4 times more likely todevelop breast cancer compared with the general population. Atypical hyperplasiahas been recommended to be used as a criterion for the inclusion of women inchemoprevention programs. Chemoprevention offers promise as a strategy forreducing the incidence of breast cancer in high-risk population.Methods: A literature search was conducted in PubMed and Scopus databasesusing the search terms “breast atypia,” “chemoprevention,” and “risk-reducingtherapy” for papers published from 1966 to Aug 2017. The search was limited toEnglish-language papers and human studies. It yielded 114 search items. Articleselection for possible inclusion was performed using the title and abstract. Finally,12 studies were identified as eligible for inclusion in the review.Results: The rates of atypical ductal hyperplasia (ADH) ranged from a low of 2per 10000 mammograms in 1995 to a high of 6 per 10000 mammograms in 2011.Lobular neoplasia was an incidental finding in 0.5%–3.5% of core biopsies. Trueincidence of lobular neoplasia is unknown. Women with atypical breast lesions havea 5%–11% risk of developing breast cancer within 5 years and a 17%–26% risk ofdeveloping breast cancer within 10 years. The reported risk of breast cancer withatypical hyperplasia (ADH and ALH are often grouped together) is approximately19% within 15 years. It is believed that the initiation of
chemoprevention would beappropriate; if the 10-year breast cancer risk is 4% to 8%. Breast cancer riskreduction by
chemoprevention is reported to be 32% to 55% in breast atypia.Conclusion: According to our findings, patients with a diagnosis of ADH, ALH,or severe ADH should be considered for
chemoprevention if they are at least 35years of age and have no contraindications to treatment. Only 4%–20% of high-riskwomen decide to take chemoprevention, on average.