Oncotype DX Breast Cancer Test Less Accurate for Blacks - Cancer Currents Blog National Cancer Institute sent this bulletin at 02/26/2021 10:32 AM EST Having trouble viewing this email? View it as a Web page. You are subscribed to Cancer Currents: An NCI Cancer Research Blog from the National Cancer Institute. Recent posts are listed below. Oncotype DX Breast Cancer Test May Be Less Accurate for Black Patients 02/26/2021 The test, which helps guide treatment decisions, was not as good at predicting the risk of death from breast cancer for Blacks as for Whites, a new study has found. The findings highlight the need for greater racial diversity in research studies.