Navigation Links
Princess Margaret breast cancer research finds new drug target companion prognostic test for hormone therapy resistance
Date:4/1/2013

(TORONTO, Canada April 1, 2013) A team of international cancer researchers led by Dr. Mathieu Lupien at the Princess Margaret Cancer Centre, University Health Network, has identified the signalling pathway that is over-activated in estrogen receptor (ER)-positive breast cancer cells that are resistant to hormone therapies such as tamoxifen, aromatase inhibitors or fulvestrant.

Resistance to hormone therapy is reported in almost half of ER-positive breast cancer patients and no cure is currently available. The fact that the pathway, called Notch, is a drug target creates hope for a new therapy.

The findings, published online today in PNAS, the Proceedings of the National Academy of Sciences of the United States of America, "provide a new therapeutic target against hormone therapy-resistant breast cancers and a companion test to identify tumours that would become resistant" says Dr. Lupien, a scientist at the Ontario Cancer Institute, the research arm of the cancer centre, and an Assistant Professor in the Department of Medial Biophysics, University of Toronto. He specializes in epigenetics of hormone-dependent cancers the study of non-genetic determinants of cellular identity that can also be altered to initiate or modify disease.

"In studying the epigenetics of hormone therapy resistance, we discovered that breast cancer cells behave like a chameleon. Indeed, as the chameleon changes its skin colour to camouflage itself and evade predators," says Dr. Lupien, "breast cancer cells change the appearance of their DNA through epigenetics to evade, in this case, hormone therapy." In so doing, hormone therapy-resistant breast cancer cells highlight regions of their DNA related to the Notch pathway.

At the molecular level, the research team characterized the epigenetic appearances of the DNA of drug-resistant and drug-responsive breast cancer cells. The team discovered that the Notch signaling pathway plays the predominant role in drug-resistant breast cancer cells even if cells remain positive for ER.

"This is a highly promising discovery that could rapidly translate in the clinic. Drugs against the Notch pathway are available." says Dr. Lupien. The key will be to test the efficacy of these drugs against hormone therapy resistance in breast cancer.


'/>"/>

Contact: Jane Finlayson
jane.finlayson@uhn.ca
416-946-2846
University Health Network
Source:Eurekalert

Related medicine news :

1. HRH Crown Princess Mary of Denmark announced as patron of Australian and Danish twin registries
2. Blue Deer Center in Margaretville, New York, Welcomes Theodore Finkle as New Center Manager
3. Plant Spirit Medicine Healer Training Begins March 2013 at Blue Deer Center in Margaretville, NY
4. ASH honors Margaret A. Goodell, Ph.D., with 2012 William Dameshek Prize
5. More Evidence Shows Hormone Therapy May Increase Breast Cancer Risk
6. When Breast Cancer Spreads to Lungs, Surgery May Increase Survival
7. Estrogen plus progestin use linked with increased breast cancer incidence and mortality
8. Author of new breast cancer study comments on its findings of increased risk
9. University of Maryland breast cancer research pioneer Dr. Angela Brodie named AACR Academy Fellow
10. Associated Plastic Surgeons & Consultants Reports that Insurance Denied Payment for Bilateral Breast Reconstruction Following Mastectomy
11. Newly Release Video Reveals Technical aspects of Advanced Breast Augmentation Surgery The Cold-Subfascial Breast Augmentation TM
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:6/25/2016)... ... June 25, 2016 , ... The temporary closing of Bruton Memorial Library on June 21 due ... up a new, often overlooked aspect of head lice: the parasite’s ability to live away ... a common occurrence, but a necessary one in the event that lice have simply gotten ...
(Date:6/25/2016)... ... ... As a lifelong Southern Californian, Dr. Omkar Marathe earned his Bachelors in ... School of Medicine at UCLA. He trained in Internal Medicine at Scripps Green Hospital ... at the UCLA-Olive View-Cedars Sinai program where he had the opportunity to train in ...
(Date:6/25/2016)... ... June 25, 2016 , ... Conventional wisdom preaches the benefits ... terms of the latter, setting the bar too high can result in disappointment, perhaps ... slow progress toward their goal. , Research from PsychTests.com reveals that ...
(Date:6/24/2016)... ... ... June 19, 2016 is World Sickle Cell Observance Day. In an effort to ... treatments, Serenity Recovery Center of Marne, Michigan, has issued a pain management ... (SCD) is a disorder of the red blood cells, which can cause episodes of ...
(Date:6/24/2016)... ... ... Global law firm Greenberg Traurig, P.A. announced that 20 Florida attorneys are recognized ... this recognition are considered among the top 2 percent of lawyers practicing within the ... this year’s Legal Elite Hall of Fame: Miami Shareholders Mark D. Bloom, Burt ...
Breaking Medicine News(10 mins):
(Date:6/24/2016)... 2016 According to a new ... Pen Needles, Safety Pen Needles), Needle Length (4mm, 5mm, ... Mode of Purchase (Retail, Non-Retail) - Trends & Global ... the market for the forecast period of 2016 to ... Billion by 2021 from USD 1.65 Billion in 2016, ...
(Date:6/23/2016)...  MedSource announced today that it has selected ... of choice.  This latest decision demonstrates MedSource,s commitment ... clients by offering a state-of-the-art electronic data capture ... as the EDC platform of choice in exchange ... has long been a preferred EDC platform by ...
(Date:6/23/2016)... 23, 2016  In a startling report released today, National ... by lacking a comprehensive, proven plan to eliminate prescription opioid overdoses. ... of how states are tackling the worst drug crisis in recorded ... – Kentucky , New Mexico ... . Of the 28 failing states, three – Michigan ...
Breaking Medicine Technology: