Abstract 2135: Racial disparities in symptom burden among women receiving early stage breast cancer chemotherapy
Authors: Nasrollahi Elham , Abujaradeh Hiba , Mazanec Susan , O'Brien Julia , Schlemmer Isabelle M. , Rosenzweig Margaret 
Published: March 2024

Abstract
Purpose: The purpose of this study was to compare prevalent symptoms (pain, fatigue, and physical function) and changes over time between Black and White women undergoing chemotherapy for early-stage breast cancer (ESBC) employing a longitudinal, repeated measures design over the course of ESBC.
Methods: Data collected as per protocol of 1R01MD012245, comparing racial differences in chemotherapy tolerance and dose modifications during chemotherapy treatment at baseline, midpoint, and endpoint, tailored to each patient's individual chemotherapy schedule. Race was collected by patient self-report and chart review. Symptom burden (fatigue, pain, and physical functioning) was measured by the PROMIS-29 Profile v 2.0). Area deprivation was measured using the Area Deprivation Index (ADI). Linear mixed models were used to assess racial differences in symptom burden across timepoints, and changes in symptom burden over time, adjusting for ADI.
Results: A total of 147 patients participated in this study (36% Black and 64% white).
Pain: Black patients reported significantly higher pain scores than White patients at pretherapy (MD=3.7, p=.034), midpoint (MD=5.8, p: 0.002), and endpoint (MD=7.8, p&lt;.001). Even after adjusting for area deprivation, this disparity persisted (F(1, 390)=29.43, p&lt;.001), with Black patients having higher pain scores at midpoint (MD=4.7, p: 0.02) and endpoint (MD=7.8, p&lt;.001). Pain scores worsened over time for Black patients, increasing significantly by the end of chemotherapy (MDT1-T3 =6.2, p=.010; MDT2-T3=5.8, p=.024). No significant changes in pain scores were observed over time among White patients.
Fatigue: After adjusting for area deprivation, fatigue significantly increased at the endpoint (MDT1-T3=8.9, p&lt;.001) for Black patients. Among White patients, fatigue increased at midpoint (MDT1-T2=5.7) and continued to worsen at the endpoint (MDT1-T3=10.1, p&lt;.001; MDT2-T3=4.3, p=.017).
Physical Function: Black patients had significantly lower physical function than White patients at the midpoint (MD=4.0, p=.027). By the end of chemotherapy, physical function deteriorated significantly for Black patients (MDT1-T3=7.8, p&lt;.001), and White patients (MDT1-T3=7.7, p&lt;.001; MDT2-T3=4.8, p=.002). Correlations between the ADI and symptom severity and physical function revealed that living in more deprived areas was associated with greater pain severity (r=-.227, p=.002, 56.3 vs. 50.1) and worse physical function (r=-.190, p=-.035, 40.6 vs. 42.4) at the completion of chemotherapy.
Conclusions: The findings indicate that race and area deprivation are associated with symptom trajectories over the course of ESBC chemotherapy. Further research is warranted on how to best assess and relieve symptom burden among Black ESBC patients so that existing disparities in treatment and treatment outcomes are not perpetuated.
Citation Format: Elham Nasrollahi, Hiba Abujaradeh, Susan Mazanec, Julia O'Brien, Isabelle M. Schlemmer, Margaret Rosenzweig. Racial disparities in symptom burden among women receiving early stage breast cancer chemotherapy [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2024; Part 1 (Regular Abstracts); 2024 Apr 5-10; San Diego, CA. Philadelphia (PA): AACR; Cancer Res 2024;84(6_Suppl):Abstract nr 2135.