Understanding the association between body mass index and chemotherapy dose reductions in women treated for stage I-IIIA breast cancer.

ABSTRACT: Historically, breast cancer patients with obesity have been more likely than normal-weight patients to receive dose-reduced chemotherapy, although contemporary dosing practices of patients with obesity remain unclear. Among 9708 women treated with adjuvant chemotherapy for stage I-IIIA breast cancer at two integrated healthcare delivery systems (2005-2019), we used generalized linear models to estimate adjusted prevalence ratios between body mass index (BMI) and comorbidity and chemotherapy dosing (first cycle dose reduction (FCDR), dose proportion < 90%) and average relative dose intensity (ARDI) < 90%). A strong, independent association was observed between BMI and FCDR (PR_{BMI:40+ vs 18.5-<25}: 9.74; 95% CI: 7.43-12.8; p-trend < 0.001) and ARDI < 90% (PR_{BMI:40+ vs 18.5-<25}

SUBMITTER: Bhimani J 

PROVIDER: S-EPMC12572154 | biostudies-literature | 2025 Oct

REPOSITORIES: biostudies-literature