Abstract C013: Racial disparities in Interpersonal Processes of Care (IPC) during early stage breast cancer chemotherapy: Associations with symptoms and the ability to receive dose-intensive chemotherapy

Abstract Purpose: Documented racial disparities exist in the dose intensity of early-stage breast cancer (ESBC) chemotherapy, partly due to chemotherapy symptom toxicity and subsequent dose modifications. Effective communication is crucial for early symptom mitigation. We explored the associations between racial differences in patient-clinician communication, symptom experience, and the ability to receive the full dose of ESBC chemotherapy. Methods - A descriptive, correlational design compared clinician communication, symptoms, and the ability to obtain dose-intensive ESBC chemotherapy by race. Multi-site - large, urban breast cancer outpatient clinics. Patients completed the 18-item Interpersonal Processes of Care (IPC) and 13-item Symptom Distress Scale (SDS) at baseline and each chemotherapy visit. The IPC assesses clarity of communication, elicitation of concerns, explaining results, shared decision-making, compassion, discrimination due to race/ethnicity, and disrespectful office staff. Mean scores for IPC and SDS were calculated for each visit, and average scores across all visits were created for each participant; chemotherapy dose intensity - Receiving 85% or more of the prescribed chemotherapy within the projected timeline, dichotomized to yes or no—Analysis - IBM® SPSS®, version 27. Descriptive statistics were generated for raw data. Pearson’s correlations were used to examine bivariate associations and univariate and multivariate logistic or linear regression models to explore associations further. Results – N = 216 women, 37% - Black and 63% - White. The mean age was 52.99 ± 12.31 years. IPC - Black patients reported significantly higher (worse) IPC scores for "lack of clarity," "discrimination," and "disrespectful office staff" compared to White patients (all ps ≤ 0.01). Associations of SDS and IPC - Patients with higher IPC subscale scores for "lack of clarity," "discrimination," and "disrespectful office staff," and lower scores for "compassion and respect" experienced significantly higher levels of symptom distress (all ps < 0.05). Associations between IPC and Dose Intensity - Patients reporting higher (worse) discrimination scores were less likely to receive 85% of the prescribed chemotherapy. The IPC "discrimination" subdomain score was significantly associated with chemotherapy dose intensity (χ2(1)=6.910, p=0.009). Each one-unit increase in perceived "discrimination" subdomain score increased the likelihood of not receiving prescribed chemotherapy (B=0.985, OR=2.602, p=0.014) by approximately 160.2%. Conclusions - Black patients perceive poorer quality IPC than White patients during ESBC chemotherapy. Specific subdomains of IPC are associated with worse symptom distress and the inability to receive the full dose of ESBC chemotherapy, primarily driven by perceived discrimination. We must understand the relationship between race, communication, symptoms, and the ability to receive appropriate chemotherapy dose intensity. Citation Format: Margaret Q. Rosenzweig, Hiba Q. Abujaradeh. Racial disparities in Interpersonal Processes of Care (IPC) during early stage breast cancer chemotherapy: Associations with symptoms and the ability to receive dose-intensive chemotherapy [abstract]. In: Proceedings of the 17th AACR Conference on the Science of Cancer Health Disparities in Racial/Ethnic Minorities and the Medically Underserved; 2024 Sep 21-24; Los Angeles, CA. Philadelphia (PA): AACR; Cancer Epidemiol Biomarkers Prev 2024;33(9 Suppl):Abstract nr C013.