Abstract PO1-10-04: Racial and Ethnic Disparities in Anthracycline and HER2-targeted Cardiotoxicity in Patients With Breast Cancer Using Global Longitudinal Strain Imaging Techniques

Abstract Purpose: Studies of global longitudinal strain (GLS) as a predictor of cancer treatment-related cardiac dysfunction (CTRCD) have been limited in racial/ethnic minority populations who are more likely to have risk factors associated with CTRCD. Our aim was to assess the utilization of GLS and development of CTRCD in a racially and ethnically diverse population of patients at an academic center in New York City. Methods: Patients were included if they had a breast cancer diagnosis and began treatment with anthracycline or HER2-directed therapies at Columbia University Irving Medical Center (CUIMC) from February 1, 2020-July 31, 2022. All patients and variables were identified via the electronic health record. Cardiovascular comorbidities including obesity, hypertension, diabetes, hyperlipidemia, coronary artery disease, congestive heart failure, and other cardiac disease, were recorded. Receipt of transthoracic echocardiogram(s) (TTE) with/without GLS were recorded, along with GLS and left ventricular ejection fraction (LVEF) values. CTRCD was defined as LVEF decrease of ≥10% to a LVEF value 53% or GLS decrease of ≥ 15% from baseline or GLS -18%. Analyses included descriptive statistics and univariable and multivariable logistic regression models to evaluate predictors of CTRCD by either LVEF or GLS definition. Results: We identified 270 eligible patients. Mean age was 51.8 years (standard deviation 13.0), 85 (31.5%) identified as White, 47 (17.4%) as Black/African, and 16 (5.9%) as Asian; 135 (50.0%) identified as Non-Hispanic/Latino, and 79 (29.2%) as Hispanic/Latino. Approximately half of the patient cohort, n=137 (50.7%) had a TTE with GLS during the study period. Of the TTEs done at CUIMC (n=658), 270 (41%) were ordered with GLS assessment, of which 184 (68%) reported a GLS value and 86 (32%) were not assessable due to image quality. Forty-three (16%) patients developed CTRCD: 20 (7%) by GLS criteria, 13 (5%) by LVEF criteria, and 10 (4%) by both GLS and LVEF criteria. In univariable analyses, race (OR 5.78, 95%CI 1.62-20.4 Asian compared to White), treatment with HER2 therapy without anthracycline versus anthracycline (OR 2.78, 95%CI 1.34-6.23), and prescription for cardiac medication prior to systemic therapy (OR 2.27, 95%CI 1.08-4.63) were predictors of CTRCD by any definition. In multivariable analysis, race (OR 7.86, 95%CI 1.71-38.50 Asian compared to White), and receipt of HER2 therapy without anthracycline compared to anthracycline (OR 5.13, 95%CI 1.42-25.00) were predictors of CTRCD. In multivariable analysis of CTRCD by GLS criteria only, race (OR 78.47, 95%CI 1.47-53.96 Asian compared to White), and treatment (OR 11.23, 95%CI 1.85-219 HER2 therapy compared to anthracycline; OR 58.7, 95%CI 1.05-60.59 HER2 therapy and anthracycline compared to anthracycline). Conclusions: In this retrospective analysis of a racially and ethnically diverse patient population, more than a third of Asian patients developed CTRCD, although the study is limited by small sample sizes. Asian race and receipt of anti-HER2 therapy were independent risk factors for CTRCD. Asian race was especially a predictor of CTRCD by GLS definition. Detection bias may explain the differences in CTRCD by drug class, as patients complete serial TTEs while receiving HER2-directed therapy, while patients who receive an anthracycline without HER2-directed therapy typically only receive a baseline TTE. Future research to better characterize racial differences in CTRCD incidence and develop interventions to reduce this disparity is an area warranting further investigation. Demographic and Tumor Related Factors Associated with CTRCD (n=270) Univariable and multivariable analysis of CTRCD by LVEF or GLS definition. Multivariable analysis was adjusted for all variables listed. Citation Format: Amanda Wang, Jayant Raikhelkar, Rohit Raghunathan, Julia McGuinness, Neil Vasan, Meghna Trivedi, Kevin Kalinsky, Katherine Crew, Melissa Beauchemin, Jason Wright, Dawn Hershman, Melissa Accordino. Racial and Ethnic Disparities in Anthracycline and HER2-targeted Cardiotoxicity in Patients With Breast Cancer Using Global Longitudinal Strain Imaging Techniques 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 PO1-10-04.