Abstract PO3-09-09: Interventions to improve adherence to oral endocrine therapy for prevention or treatment of breast cancer in African American women of low socioeconomic status
Authors: Johnson Camille , Adigwe Ann , Ekezie Nicole , Fatima Bilqees , Majd Zahra , Houk Keith , Patel Tejal , Shimko Rob , Ononogbu Onyebuchi , Abughosh Susan , Trivedi Meghana 
Published: May 2024

Introduction: Adherence to oral endocrine therapy (OET) for the prevention and treatment of hormone receptor-positive breast cancer (BC) is important as they reduce the risk of new or recurrent BC. OET adherence is greatly compromised in women of lower socioeconomic status (SES). We have recently reported that patients belonging to the African American race, with longer time on OET, and using OET in the prevention setting are more likely to be non-adherent to OET. Therefore, our study aims to design unique patient-centered interventions and pilot test their feasibility, acceptability, and effectiveness in improving OET adherence in African American women of low SES.

Patients and Methods: This prospective study includes adult, African American women on OET for either the prevention or treatment of BC at Harris Health System in Houston, Texas, serving the underserved patient population with low SES. The first intervention is a motivational interviewing (MI) based telephone intervention consisting of an initial phone call followed by five monthly follow-up calls with an MI-trained pharmacy student. The second intervention is a theatre-based educational video with a script developed by a local African American playwright, featuring African American women. Three African American BC survivors with experience in taking OET consulted with the study team to convey their BC journey and explain challenges with taking OET. They provided feedback on the script and production of the educational video. Informed consent was obtained verbally via phone in the MI intervention and electronically for the educational video intervention. Individuals in both intervention groups were compensated with Walmart eGift cards. Pre- and post-intervention adherence was measured using the proportion of days covered (PDC) over 6-12 months and compared using a paired t-test. Participants also complete a survey at the end of the interventions to determine their acceptability. The survey responses were summarized descriptively.

Results: For the MI intervention initiated in 20 patients, the median age and BMI of study participants was 61 years (range: 49-71) and 30.8 (range: 22.3-57.8) respectively. All participants identified their ethnicity as non-Hispanic or Latino. The majority of participants had hypertension (n=13, 65%) and/or hyperlipidemia (n=11, 55%) with depression (n=3, 15%) and diabetes (n=8, 40%) being less common. The most common stage of BC cancer was stage I (n=9, 45%), followed by stage II (n=4, 20%), stage 0 (n=3, 15%) and then stage III (n=2, 10%) and IV (n=2, 10%). Letrozole was the most common OET (n=13, 65%), followed by tamoxifen (n=3, 15%), anastrozole (n=2, 10%) and exemestane (n=2, 10%). Most participants were not on a CDK 4/6 inhibitor (n=18, 90%). The median number of years on therapy was 2.8 (0.6-4.5). The median pre-intervention PDC for OET was 0.7 (range: 0.2-0.9). The MI intervention is expected to be complete by October 2023 for all patients. For the educational video intervention, 7 out of the anticipated 25 participants have been enrolled in the intervention. All patients were taking OET for BC treatment and not prevention. Letrozole (n=3, 43%) and anastrozole (n=3, 43%) were the most utilized OET, followed by exemestane (n=1, 14%). While 5 participants (71%) in this intervention reported not missing any OET doses in the past week, 2 patients (29%) reported missing all 7 doses within the past week. After watching the educational video, most participants (n=6, 86%) reported that they strongly agreed to take their OET regularly. The recruitment of study participants for this intervention is ongoing.

Conclusion: In this study, we report that MI and educational video interventions are feasible. The interventions and analysis of their effectiveness and acceptability are ongoing.

Citation Format: Camille Johnson, Ann Adigwe, Nicole Ekezie, Bilqees Fatima, Zahra Majd, Keith Houk, Tejal Patel, Rob Shimko, Onyebuchi Ononogbu, Susan Abughosh, Meghana Trivedi. Interventions to improve adherence to oral endocrine therapy for prevention or treatment of breast cancer in African American women of low socioeconomic status [abstract]. In: Proceedings of the 2023 San Antonio Breast Cancer Symposium; 2023 Dec 5-9; San Antonio, TX. Philadelphia (PA): AACR; Cancer Res 2024;84(9 Suppl):Abstract nr PO3-09-09.