Conclusions
tumor
TUMOR
In this cohort study of clinical trial participants treated for eBC, we observed worse survival among Black or Hispanic participants within subgroups defined by age, BMI, or tumor subtype. These data suggest that, in addition to addressing the social and structural factors that contribute to racial and ethnic disparities overall, it may be necessary to identify and address subgroup-specific mechanisms underlying the observed associations. It is critical to evaluate specific contributors to racial and ethnic disparities in survival as these may inform future interventions to improve these disparities.