AUG 18, 2026 · JOURNAL ARTICLE
The Assessment of Race, the 21-Gene Recurrence Score, and Breast Cancer Outcomes at Kaiser Permanente
Cancers
A retrospective cohort study of adequate size reporting statistically significant mortality differences by race and Oncotype DX score, but with limited scope (single health system) and inconsistent significance across score categories, requiring confirmation in diverse populations.
Reported
Sample size2577
Hazard of mortality, Black/AA vs…49% greater risk
p-value, overall mortality by race0.0444