Navigation Links
Major discovery on the mechanism of drug resistance in leukemia and other cancers
Date:5/28/2014

A mechanism that enables the development of resistance to Acute Myeloid Leukemia (AML) anticancer drugs, thereby leading to relapse, has been identified by Kathy Borden of the University of Montreal's Institute for Research in Immunology and Cancer (IRIC) and her collaborators. Kathy Borden is a Principal Investigator at IRIC and a professor at the university's Department of Pathology and Cell Biology. The development of drug resistance is one of the main problems in clinical oncology and the cause of relapse in many patients.

The new discovery, recently published in the prestigious scientific journal Nature, constitutes a major breakthrough in the fight against AML, one of the deadliest forms of leukemia, because it immediately suggests strategies to overcome drug resistance. Furthermore, the type of drug resistance the team identified is likely implicated in other cancers and a successful new treatment regimen based on these findings could have broad applications in treating cancer.

Previous work by Professor Borden's team had indicated that the use of ribavirin, a compound that was originally developed as an antiviral drug, could result in real benefits for certain cancer patients. With support from The Leukemia & Lymphoma Society of the USA, a first clinical trial using ribavirin to treat poor-prognosis AML patients was performed under the supervision of Dr. Sarit Assouline and Dr. Wilson Miller of the Segal Cancer Center at the Jewish General Hospital in Montral.

"This first clinical study yielded extremely promising results in most patients, including remissions, with no significant treatment-related toxicity. However, as is often the case when using a single drug, all patients eventually relapsed," recall Drs. Assouline and Miller. The multi-center study also included patients from the Hpital Maisonneuve-Rosemont (HMR) in Montreal and the McMaster University/Hamilton Health Sciences Center in Hamilton, Ontario.

In their recent article, the researchers describe why, in most of the patients, ribavirin as well as the standard chemotherapeutic drug cytarabine (Ara-C), eventually become ineffective at killing cancer cells. "By studying drug resistant cancer cells from AML patients and head and neck tumors, we found that a gene called "GLI1" is dramatically overactive in these cells," explains Hiba Zahreddine, doctoral student in the laboratory of Kathy Borden and first author of the Nature article. "With the help of our colleagues at Pharmascience Inc. we were then able to show that this results in a specific chemical change to the drugs, that prevents their toxicity toward the cancer cells," continues Professor Borden.

Fortunately, drugs that inhibit the activity of GLI1 are currently available and the scientists showed that these drugs could switch the cancer cells back into a ribavirin-sensitive state. It is hoped that when used in combination-therapy with ribavirin (or more standard chemotherapy), these drugs will prevent the development of drug resistance in patients. The team has now received approval from Health Canada to undertake a new clinical trial to test the novel drug combination in AML patients.

As part of its research partnership with Universit de Montral, Pharmascience Inc. will continue to manufacture and provide the ribavirin necessary for this clinical trial. "If this new approach is successful, it could have very broad applications since the mode of action of ribavirin suggests that it could be effective against up to 30% of all cancers including some types of breast, prostate, colon, stomach and head and neck cancers in addition to AML," explains Morris Goodman, co-founder and Chairman of the Board of Pharmascience Inc.


'/>"/>

Contact: William Raillant-Clark
rw.raillantclark@gmail.com
514-566-3813
University of Montreal
Source:Eurekalert

Related medicine news :

1. Major EPSRC Programme Grant to support new Oxford Centre for Drug Delivery Devices
2. Therapy sought to reduce major risk from minor bleeding that can follow stroke
3. Major lung resection safer than ever, especially at the busiest hospitals
4. Genetic alterations in shared biological pathways as major risk factor for ASD
5. Gen X obesity a major problem for healthcare, workforce
6. Surgery after major stroke also improves survival odds in elderly patients
7. A majority prefers letting computers decide
8. Major third-hand smoke compound causes DNA damage -- and potentially cancer
9. Patient requests for specific drugs have major impact on prescribing, reports study in Medical Care
10. Major League Baseball players win more games following Tommy John surgery
11. NYU researchers find majority of Latinas are unaware of their risk of diabetes
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:2/13/2016)... ... February 13, 2016 , ... ... Clinical Data Management Solution Providers list for its expertise in eClinical Solutions. DDi ... expertise to serve the technology needs of global clients. DDi provides smarter technology ...
(Date:2/12/2016)... LA (PRWEB) , ... February 12, 2016 , ... The ... St. Landry and Evangeline Parishes. The purpose of these scholarships is to encourage ... encourage those individuals to seek employment within these two parishes. , “We have ...
(Date:2/12/2016)... ... February 12, 2016 , ... CDRH Enforcement Trends: , Back to the Future , ... , As Winston Churchill said, “Those who don’t learn from history are doomed to ... expect when they come knocking this year. But that takes time. , Take a ...
(Date:2/12/2016)... ... February 12, 2016 , ... As a former television executive, ... demanding job, and no time to decompress, Rabinowitz found herself drawn to a casual ... for its impact on her life, implementing a 20-minute-per-day meditation practice with her team. ...
(Date:2/12/2016)... ... February 12, 2016 , ... The ... Zuckerberg San Francisco General Hospital on April 5-7. The series is a multi-day, ... new habits. The workshops cover a broad range of topics, including coaching skills, ...
Breaking Medicine News(10 mins):
(Date:2/11/2016)... 11, 2016   Health 2.0 , the premiere ... technologies, announced today " 10 Year Global Retrospective ", ... over the past ten years.   ... Health 2.0 has served as the preeminent thought-leader in ... thousands of technologies, companies, innovators, and patient-activists through an ...
(Date:2/11/2016)... MARIETTA, Ga. , Feb. 11, 2016  MiMedx ... medicine company utilizing human amniotic membrane and other birth ... proprietary platforms to develop and market advanced products and ... RBC Capital Markets, 2016 Global Healthcare Conference in ... Petit, Chairman and CEO, Michael J. Senken , ...
(Date:2/11/2016)... PORTLAND, Ore. , Feb. 11, 2016 /PRNewswire/ ... pleased to announce the acquisition of SolutionsRx, a full-service ... access hospitals. Along with providing traditional contract pharmacy services, ... to assist clients in navigating the complex 340B regulatory ... of Wellpartner. --> James R. Love , ...
Breaking Medicine Technology: