Different molecular subtypes of breast cancer respond differently to chemotherapy, a research team from The University of Texas M. D. Anderson Cancer Center reported at the annual San Antonio Breast Cancer Symposium meeting.
The findings reinforce the emerging notion that breast cancer should be classified according to its gene expression profile, in order to make accurate predictions about the outcome of the disease and select the optimal treatment for patients, says the senior investigator, Lajos Pusztai, M.D., Ph.D., an associate professor in the Department of Breast Medical Oncology.
Four major molecular subgroups of breast cancer ? normal-like, luminal (ER-positive), basal-like (mostly ER-negative), or erbb2+ (mostly HER-2 amplified) ? have been previously defined, based on expression of 424 genes involved in cancer development. Scientists have already shown that each subgroup has a different prognosis. In this recent study Pusztai and his group looked at whether these molecular subgroups also respond differently to chemotherapy that is delivered before surgery.
Nancy Jensen | EurekAlert!
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