Abstract P5-13-02: Chemoprevention utilization in patients with a history of atypical hyperplasia, atypical lobular hyperplasia, or lobular carcinoma in-situ: A retrospective chart review of patients diagnosed at an urban hospital with a large minority patient population

Background: The Breast Cancer Prevention Trial (BCPT) and the Study of Tamoxifen and Raloxifene (STAR) trial showed that chemoprevention can reduce the risk of invasive breast cancer by nearly 50%. Despite these results, studies have shown that while an estimated 2 million women in the United States are eligible for chemoprevention, actual acceptance of these medications is low. Improving chemoprevention utilization rates hinges on better understanding current rates of utilization and factors affecting patient acceptance. Reported rates and barriers to chemoprevention use may not accurately reflect true utilization patterns in lower socioeconomic, minority patient populations. The aim of this IRB approved retrospective study was to characterize the rate and factors associated with chemoprevention use in patients with a diagnosis of atypical ductal hyperplasia (ADH), atypical lobular hyperplasia (ALH), or lobular carcinoma in-situ (LCIS) at an urban hospital with a high minority population.

Methods – A retrospective chart review was performed for all diagnoses of ADH, ALH, and LCIS made at the University of Maryland Medical Center between the years 2005-2015. Concurrent DCIS or invasive cancer were excluded. Demographic and clinical information including age, race, education, GAIL score, BMI, and use of chemoprevention was recorded. Univariable and multivariable logistic regression were performed to identify factors associated with chemoprevention discussion and use.

Results – 301 diagnoses of ADH/ALH/or LCIS were obtained and 127 women were eligible for analysis. The median age was 53 years old with 47% of patients being premenopausal. The majority were African-American (65%) and 51% had a high school degree or less. The median 5 year risk for developing breast cancer based on the GAIL model was 2.4%. The chemoprevention utilization rate for our patient population was 28% (n=34). Race, menopausal status, and breast density were not associated with chemoprevention discussion or use. We found that patients were more likely to have a chemoprevention discussion with their provider if they were older (p=0.03) or if they were referred to medical oncology (p<0.001, Fisher's exact test).

Conclusions - Our study evaluated chemoprevention use in an understudied predominantly African-American patient population. We found a higher rate of chemoprevention utilization (28%) compared to previously reported rates. Age and medical oncology referral had a significant impact on provider-patient chemoprevention discussion. Though limited due to small sample size, our study nonetheless provided thought provoking results. Older patients may be at higher risk for developing breast cancer, however, it is important to consider that younger patients with risk factors may have a more favorable endocrine therapy benefit-risk ratio. In addition, our results highlight the importance of encouraging all physicians who are involved in women's' breast health to have a chemoprevention discussion with eligible patients, or for these physicians to refer patients to a medical oncologist for further discussion.

Citation Format: DeRidder A, Mainor C, Goloubeva O, Ioffe O, Bellavance E, Tkaczuk K, Rosenblatt P. Chemoprevention utilization in patients with a history of atypical hyperplasia, atypical lobular hyperplasia, or lobular carcinoma in-situ: A retrospective chart review of patients diagnosed at an urban hospital with a large minority patient population [abstract]. In: Proceedings of the 2017 San Antonio Breast Cancer Symposium; 2017 Dec 5-9; San Antonio, TX. Philadelphia (PA): AACR; Cancer Res 2018;78(4 Suppl):Abstract nr P5-13-02.