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Response to Antiestrogen Therapy Enhanced in Luminal Breast Tumor

by Kathy Jones on September 5, 2013 at 9:01 PM
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 Response to Antiestrogen Therapy Enhanced in Luminal Breast Tumor

Depending on the molecular and genetic information from the tumors, breast cancer can be divided into 4 major subtypes.

Each subtype is associated with different prognosis and should be taken into consideration when making treatment decisions. In this issue of the Journal of Clinical Investigation, Rebecca Cook and colleagues at Vanderbilt University, found that expression of an oncogene, ERBB3, was enhanced in luminal breast cancers compared to other breast cancer subtypes. Addition of the ERBB3 protein to cultured luminal breast cancer cells increased the growth of the cells; however, depletion of this protein with an antibody promoted cancer cell death, and decreased tumor growth in vitro. The authors also demonstrated that ERBB3 was upregulated in luminal tumor samples and in cancer cell cultures that were treated with the cancer drug fulvestrant. Furthermore, the authors found that fulvestrant treatment in combination with anti-ERBB3 decreased both tumor cell survival and growth. These data suggests that ERBB3 could be a target for treatment of fulvestrant resistant breast cancers.

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Source: Eurekalert

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