A new study has found a possible mechanism for tamoxifen resistance in breast cancer and provides evidence that another cancer drug--gefitinib (Iressa)--may be able to restore tamoxifens anticancer activity. The study appears in the June 16 issue of the Journal of the National Cancer Institute.
Although adjuvant tamoxifen can reduce the risk of death for women with invasive breast cancer by about 15% over 10 to 15 years, many women do not receive any benefit from the drug. Even among patients most likely to benefit from tamoxifen--those with tumors that express the drugs target, the estrogen receptor (ER)--only 40% to 50% actually benefit. Studies have shown that patients with ER-positive tumors that express high levels of HER2/neu and the ER coactivator AIB1 often develop tamoxifen resistance, but the mechanism of the resistance has not been identified.
To find this mechanism, Rachel Schiff, Ph.D. and C. Kent Osborne, M.D., of the Baylor College of Medicine in Houston, and colleagues studied molecular interactions in breast cancer cells that expressed high levels of both HER2 and AIB1. They found that, in these cells, tamoxifen acted like an estrogen agonist and stimulated tumor growth. However, when the breast cancer cells were treated with the receptor tyrosine kinase inhibitor gefitinib, tamoxifen once again acted as an estrogen antagonist and tumor growth was blocked.
Sarah L. Zielinski | EurekAlert!
Study suggests possible new target for treating and preventing Alzheimer's
02.12.2016 | Oregon Health & Science University
The first analysis of Ewing's sarcoma methyloma opens doors to new treatments
01.12.2016 | IDIBELL-Bellvitge Biomedical Research Institute
A multi-institutional research collaboration has created a novel approach for fabricating three-dimensional micro-optics through the shape-defined formation of porous silicon (PSi), with broad impacts in integrated optoelectronics, imaging, and photovoltaics.
Working with colleagues at Stanford and The Dow Chemical Company, researchers at the University of Illinois at Urbana-Champaign fabricated 3-D birefringent...
In experiments with magnetic atoms conducted at extremely low temperatures, scientists have demonstrated a unique phase of matter: The atoms form a new type of quantum liquid or quantum droplet state. These so called quantum droplets may preserve their form in absence of external confinement because of quantum effects. The joint team of experimental physicists from Innsbruck and theoretical physicists from Hannover report on their findings in the journal Physical Review X.
“Our Quantum droplets are in the gas phase but they still drop like a rock,” explains experimental physicist Francesca Ferlaino when talking about the...
The Max Planck Institute for Physics (MPP) is opening up a new research field. A workshop from November 21 - 22, 2016 will mark the start of activities for an innovative axion experiment. Axions are still only purely hypothetical particles. Their detection could solve two fundamental problems in particle physics: What dark matter consists of and why it has not yet been possible to directly observe a CP violation for the strong interaction.
The “MADMAX” project is the MPP’s commitment to axion research. Axions are so far only a theoretical prediction and are difficult to detect: on the one hand,...
Broadband rotational spectroscopy unravels structural reshaping of isolated molecules in the gas phase to accommodate water
In two recent publications in the Journal of Chemical Physics and in the Journal of Physical Chemistry Letters, researchers around Melanie Schnell from the Max...
The efficiency of power electronic systems is not solely dependent on electrical efficiency but also on weight, for example, in mobile systems. When the weight of relevant components and devices in airplanes, for instance, is reduced, fuel savings can be achieved and correspondingly greenhouse gas emissions decreased. New materials and components based on gallium nitride (GaN) can help to reduce weight and increase the efficiency. With these new materials, power electronic switches can be operated at higher switching frequency, resulting in higher power density and lower material costs.
Researchers at the Fraunhofer Institute for Solar Energy Systems ISE together with partners have investigated how these materials can be used to make power...
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