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Trio of drugs may combat 'triple negative' breast cancer
Date:12/10/2010

A gene target for drug resistance, a triple-drug cocktail for triple negative breast cancer, and patients' risk for carpal tunnel syndrome are among study highlights scheduled to be presented by Johns Hopkins Kimmel Cancer Center scientists during the 33rd Annual CTRC-AACR San Antonio Breast Cancer Symposium, held Dec. 8-12. The information is embargoed for the time of presentation at the symposium.

TRIO OF DRUGS MAY COMBAT "TRIPLE NEGATIVE" BREAST CANCER
(Presentation # PD01-05)

Working with cell cultures and mouse models, researchers at the Johns Hopkins Kimmel Cancer Center have tested a cocktail of three drugs that holds promise for treating so-called triple negative breast cancers.

Women with such cancers lack all three hormone receptors estrogen, progesterone and human epidermal growth factor 2 (HER2). Currently, treatments for triple negative breast cancers are limited to surgery, chemotherapy and radiation, which provide some improvements but overall poor prognoses.

In the new study, Johns Hopkins scientists began with a drug called Entinostat, which blocks an enzyme that unfolds DNA, providing regulatory molecules access to genes within and also reactivates a gene called retinoic acid receptor-beta (RARβ). Then, they added a drug called All Trans Retinoic Acid (ATRA), related to Vitamin A, which binds a protein made by the reactivated RARβ gene. Together, the ATRA drug and RARβ gene act as a brake on cancer cell growth. The scientists completed the drug cocktail with conventional chemotherapy using either low doses of doxorubicin or paclitaxel.

According to the scientists, each of the three drugs used alone may have some effect on killing tumors cells, but combining them tips the scale in favor of killing more cells.

Tests on laboratory-cultured cells showed that the triple combo therapy halted the growth of multiple triple negative breast cancer cell lines more effectivel
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Contact: Vanessa Wasta
wasta@jhmi.edu
410-614-2916
Johns Hopkins Medical Institutions
Source:Eurekalert

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