The shorter survival of black vs white women with breast cancer remains
unexplained. Tammemagi and colleagues assessed the association of comorbid
conditions with survival in a cohort of black and white breast cancer patients
who were followed up for a median of 10 years. They found more recurrence/progression
and worse all-cause, breast cancer–specific, and competing-cause survival
in black women. Adverse comorbidities, more common in black than white women,
were associated with worse all-cause and competing-cause survival, but that
did not explain racial disparity in breast cancer–specific survival.