Helen Branswell, The Canadian Press
Race may influence whether women diagnosed with breast cancer will survive, suggests a new study which found black women are more likely to die even when their tumours are found when they are small and theoretically easier to treat.
The study, which is based on U.S. data, said that even when breast cancer is diagnosed at Stage 1, black women have a higher risk of dying than women of Japanese ethnicity or white women.
Senior author Dr. Steven Narod said it had long been thought differences in outcomes between white and black women with breast cancer related to access to quality health care in the United States, where before the Affordable Care Act came into effect more black women may have been without health insurance.
But he said that by mining a large U.S. database that registers breast cancer cases by stage at diagnosis, income status, race and ethnicity, he and his colleagues concluded that isn't the case.
"The assumption that we're going to eliminate differences in cancer outcomes by eliminating differences in health care is not that well founded," said Narod, a leading breast cancer researcher who is based at Toronto's Women's College Hospital.
"There may be intrinsic biological differences that account for some of the differences in outcomes that cannot be eliminated."
Narod said he thinks similar results would be seen if a matching study was done in Canada, but without doing the work he cannot be sure.