Navigation Links
Scan Detects Oxygen Levels in Tumors
Date:4/23/2008

Technology could one day guide individualized therapy for cancer patients

WEDNESDAY, April 23 (HealthDay News) -- New research suggests that scientists are close to developing a simple way to measure oxygen levels in tumors, giving doctors a heads-up about what kind of treatment is best for individual patients.

The findings fit into an emerging trend of individualized treatment for patients with cancer instead of treating people the same way, said Dr. Mark Dewhirst, a professor of radiation oncology at Duke University Medical Center.

"If successful, [the trend] will revolutionize the way that we treat cancer," said Dewhirst, who co-wrote a commentary accompanying the new study, published April 22 in the Journal of Clinical Investigation.

Scientists began realizing the important role of oxygen in tumors about 50 years ago, said study co-author James Mitchell, branch chief of radiation biology at the U.S. National Cancer Institute's Center for Cancer Research. The scientists discovered that tumors with higher concentrations of oxygen were more susceptible to radiation, he said.

"Radiation damages cells by causing damage to DNA, and one particular type of damage renders the DNA molecule non-reparable," Mitchell said. But less oxygen in the tumor allows tumor cells to survive more easily by making the DNA destruction process more difficult, he said.

According to Dewhirst, the same is true for chemotherapy drugs, which also don't work as well when tumors have less oxygen.

Lower levels of oxygen create other problems, Dewhirst. "One would think at first that lack of oxygen would make tumors unhealthy and easy to kill," he said. "But actually, the opposite happens -- tumor cells that lack oxygen become more aggressive and more difficult to kill."

Tumors with lower oxygen levels even spread more easily through the body, he said.

Doctors can check oxygen levels in patients by inserting a needle. But doctors can't insert needles into some patients, and. in others, it's difficult to insert the needle deep enough, Mitchell said.

In the new study, the researchers tested a scanning technique called pulsed electron paramagnetic resonance imaging and used it in tandem with magnetic resonance imaging. The study authors said they were able to successfully measure oxygen levels in tumors in mice by using the non-invasive technology.

"The imaging that is described in this study provides all of the information necessary to evaluate oxygen levels in tumors as well as to examine underlying causes for the lack of oxygen," Dewhirst said. "The fact that all of the imaging is completely non-invasive provides the ability to perform this measurement more than once, (meaning) this could be used to monitor the effectiveness of cancer therapy."

There are caveats, however. The research hasn't reached the human testing level yet, and it may not work in people. "Scaling up the method to make it suitable for use in humans will be a significant challenge, but not impossible," Dewhirst said.

For now, the plan is to launch more studies with animals to see if the technique works as a way to test cancer drugs.

More information

Learn more about cancer from the U.S. National Institutes of Health.



SOURCES: Mark W. Dewhirst, DVM, Ph.D., Gustavo S. Montana professor of radiation oncology and professor of pathology and biomedical engineering, Duke University Medical Center, Durham, N.C.; James Mitchell, Ph.D., branch chief, radiation biology, Center for Cancer Research, U.S. National Cancer Institute, Bethesda, Md.; April 22, 2008, Journal of Clinical Investigation


'/>"/>
Copyright©2008 ScoutNews,LLC.
All rights reserved

Related medicine news :

1. Faster Test Detects Fake Tamiflu Drugs
2. MITs PANTHER sensor quickly detects pathogens
3. Laser Screen Detects Diseases in Breath
4. Yale test detects early stage ovarian cancer with 99 percent accuracy
5. Test Detects Sensitivity to HIV Drug
6. McMaster test detects the most prevalent respiratory viruses
7. CT colonography detects wide-range of extracolonic abnormalities in elderly patients
8. Blood protein detects lung cancer, even at earliest stage
9. New technique detects specific chromosomal damage, may indicate lung cancer risk
10. Mice Can Sense Oxygen Through Their Skin
11. Ukiah Home Oxygen Therapy Patients and Physicians Meet with Congressman Mike Thompson to Share Benefits of Quality Home Oxygen Care
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:12/9/2016)... ... 2016 , ... Groth Family Insurance, a Washington-based firm offering ... a charity drive to support the family of Cindy Hendrickson, a local mother ... On October 29th of this year, Cindy Hendrickson swerved to avoid an oncoming ...
(Date:12/9/2016)... Ohio (PRWEB) , ... December 09, 2016 , ... ... of miniature, folded, pharmaceutical inserts and outserts. As a means of expanding ... This addition will enable Flottman to individually code professional inserts (PIs) and patient ...
(Date:12/9/2016)... Yorktown Heights, NY (PRWEB) , ... December 09, 2016 , ... ... on Alcoholism and Drug Dependence, Inc. (NCADD) is recommending the film Whispering ... 29 states and the District of Columbia as an education tool in the war ...
(Date:12/9/2016)... (PRWEB) , ... December 09, 2016 , ... An inventor ... amputees to safely ride all types of amusement park rides. , The patent-pending SAFETY ... unit is easy to use and could be set up in a matter of ...
(Date:12/9/2016)... ... December 09, 2016 , ... ... Pierre Hotel in New York, NY, on December 3rd, to benefit Holy Name ... attended the annual event, which raised over $1 million - the largest event ...
Breaking Medicine News(10 mins):
(Date:12/9/2016)... Japan , Dec. 9, 2016 Mitsubishi ... ; President & Representative Director, CEO: Dr. Masayuki ... amyotrophic lateral sclerosis (ALS) given edaravone intravenously in 10-14 ... loss as measured by the ALS Functional Rating Scale-Revised ... International Symposium on ALS/MND in Dublin, ...
(Date:12/9/2016)... DUBLIN , Dec 9, 2016 Research ... Vaccines Market 2016-2020" report to their offering. ... The global travel vaccines market ... The report covers the present scenario and the growth ... the market size, the report considers the revenue generated from the ...
(Date:12/9/2016)... Dec. 9, 2016  Forge Therapeutics, Inc. today ... Stock Exchange: EVT, TecDAX, ISIN: DE0005664809) to advance ... the treatment of bacterial infections including those caused ... as an attractive antibacterial target for more than ... suitable chemical starting points has hampered its progress. ...
Breaking Medicine Technology: