Navigation Links
Gene change identifies brain cancer patients that respond better to treatment
Date:5/31/2011

COLUMBUS, Ohio New research proves that a change in a particular gene can identify which patients with a specific kind of brain cancer will respond better to treatment. Testing for the gene can distinguish patients with a more- or less-aggressive form of glioblastoma, the most common and an often-fatal type of primary brain cancer, and help guide therapy, the researchers say.

The prospective study looked at a gene called MGMT in tumors removed from 833 glioblastoma patients. It showed that when the gene promoter is altered by a chemical change called methylation, patients respond better to treatment.

"We show that MGMT methylation represents a new genetic test that can predict clinical outcomes in glioblastoma patients who have been treated with radiation combined with the chemotherapeutic drug temozolomide," says coauthor Dr. Arnab Chakravarti, chair and professor of Radiation Oncology and co-director of the brain tumor program at the Ohio State University Comprehensive Cancer Center Arthur G. James Comprehensive Cancer Center and Richard J. Solove Research Institute (OSUCCC James).

"Clearly, all glioblastomas are not the same. Rather, they are a collection of different molecular and genetic entities that behave uniquely and require personalized treatment," says Chakravarti, who is the translational-research study chair for the study.

Principal investigator Dr. Mark Gilbert, professor of neuro-oncology at M.D. Anderson Cancer Center, will present the research June 5, 2011, at the 2011 American Society of Clinical Oncology annual meeting in Chicago. It comes from a prospective international phase III clinical trial sponsored by the Radiation Therapy Oncology Group (RTOG).

"Our study confirms the prognostic significance of MGMT gene methylation and demonstrates the feasibility of prospective tumor-tissue collection, molecular stratification and collection of patient outcomes in a large transatlantic intergroup trial," Gilbert says.

A tentative indication that MGMT methylation status might have prognostic importance emerged from an earlier retrospective study sponsored by the European Organisation for Research and Treatment of Cancer (EORTC).

The current study (RTOG 0525) validates that finding. Patients with tumors carrying the methylated gene had an overall survival of 21 months versus 14 months for those with the unmethylated gene. The difference in progression-free survival the period after treatment during which cancer does not worsen was 8.7 months and 5.7 months for methylated versus unmethylated tumors respectively. The narrow difference, Chakravarti says, indicates that patients with the methylated gene had slower growing tumors.

About 18,500 new cases of glioblastoma multiforme are expected annually in the U.S., and 12,760 Americans are expected to die of the disease. Symptoms often include headache, seizures and motor or sensory changes. A brain scan detects the tumor. After a surgeon removes the tumor, it can be tested for MGMT methylation.

"Patients with the methylated gene could receive the standard treatment, radiation therapy plus the chemotherapeutic drug temozolomide," Chakravarti says. "Those with an unmethylated gene might receive an experimental treatment through a clinical trial."

Research is now needed, he says, to learn whether MGMT contributes directly to tumor aggressiveness, or whether it is just an indicator of other changes that cause tumor aggressiveness. "If the gene itself helps cause aggressive disease, MGMT or related DNA repair pathways might be an important targets for a novel therapies," Chakravarti says.


'/>"/>

Contact: Darrell E. Ward
Darrell.Ward@osumc.edu
614-293-3737
Ohio State University Medical Center
Source:Eurekalert

Related medicine news :

1. Autism changes molecular structure of the brain, UCLA study finds
2. When Pregnant Mom Smokes, Babys DNA May Change
3. Gene expression changes in nasal cells may help identify lung cancer in earliest stages
4. Smokers undergo the same changes in gene expression as patients with COPD
5. Ecstasy associated with chronic change in brain function
6. Climate change analysis predicts increased fatalities from heat waves
7. Adverse changes in sleep duration are associated with lower cognitive scores in middle-aged adults
8. Discovery could change the way doctors treat patients with cancer and autoimmune diseases
9. Nurse Practitioner Counsels Lifestyle Changes as Key to Heart Health
10. Lifestyle Changes Can Slash Blood Fat Levels, Experts Say
11. Climate change psychology: Coping and creating solutions
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:6/24/2016)... Fla. (PRWEB) , ... June 24, 2016 , ... Global ... Trend magazine’s 2016 Legal Elite. The attorneys chosen by their peers for this recognition ... Florida. , Seven Greenberg Traurig Shareholders received special honors as members of this year’s ...
(Date:6/24/2016)... (PRWEB) , ... June 24, 2016 , ... Comfort Keepers® ... American Cancer Society and the Road To Recovery® program to drive cancer patients to ... and other adults to ensure the highest quality of life and ongoing independence. ...
(Date:6/24/2016)... ... , ... People across the U.S. are sharpening their pencils and honing their ... in which patients and their families pay tribute to a genetic counselor by nominating ... of Genetic Counselors (NSGC) Annual Education Conference (AEC) this September. , In April, ...
(Date:6/24/2016)... New York, NY (PRWEB) , ... June 24, ... ... lifestyle publication Haute Living, is proud to recognize Dr. Barry M. Weintraub as ... believes that “the most beautiful women in the world, and the most handsome ...
(Date:6/24/2016)... ... June 24, 2016 , ... Strategic Capital Partners, LLC ... by obtaining investment capital for emerging technology companies. SCP has delivered investment ... resulted in more than a million dollars of capital investment for five companies. ...
Breaking Medicine News(10 mins):
(Date:6/24/2016)... , June 24, 2016  Consumers have taken ... regulators/payers have placed more emphasis on patient outcomes. ... support programs in the pharmaceutical industry have evolved ... Consequently, pharmaceutical companies are focusing on becoming more ... providing products and services that improve health. ...
(Date:6/24/2016)... SAN FRANCISCO, Calif. , June 24, 2016 ... GBT ), a biopharmaceutical company developing novel therapeutics ... significant unmet needs, today announced the closing of ... shares of common stock, at the public offering ... shares in the offering were offered by GBT. ...
(Date:6/24/2016)... Dublin ... of the " Global Markets for Spectroscopy Equipment" ... This report focuses on the global ... including its applications in various applications. The report deals ... three main industries: pharmaceutical and biotechnology, food and beverage, ...
Breaking Medicine Technology: