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Missing Chromosome Predicts Brain Tumor Patients' Response To Treatment

Date:
February 21, 2008
Source:
American Academy of Neurology
Summary:
People with a highly aggressive type of brain tumor who are missing a specific chromosome live longer and respond better to the chemotherapy drug temozolomide than people without this genetic abnormality. Gliomatosis cerebri is a rare type of brain tumor that is difficult to diagnosis, cannot be operated on, and has an extremely variable prognosis.
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People with a highly aggressive type of brain tumor who are missing a specific chromosome live longer and respond better to the chemotherapy drug temozolomide than people without this genetic abnormality, according to new research.  Gliomatosis cerebri is a rare type of brain tumor that is difficult to diagnosis, cannot be operated on, and has an extremely variable prognosis.

"Our findings will help doctors better predict who will respond best to temozolomide, which has recently been proposed as a new treatment for gliomatosis cerebri," said Marc Sanson, MD, PhD, with INSERM, the French government health agency, in Paris, France. "Before now, we weren't sure which factors influenced how well a person with this type of brain tumor would respond to the treatment."

For the study, 25 people with gliomatosis cerebri underwent genetic testing and received monthly treatments of temozolomide for up to two years.

The study found nearly all of the participants who were missing chromosome 1p and 19q had a higher response rate to temozolomide and lived longer.

"Eighty-eight percent of those people with this genetic signature responded well to temozolomide compared to only 25 percent of those people without the genetic abnormality," said Sanson. "In addition, those without 1p and 19q survived an average five and half years compared to only 15 months for the group with intact 1p and 19q. Those missing 1p and 19q also had more months without the tumor further progressing. Therefore, temozolomide is now our first choice of treatment for patients with gliomatosis cerebri, especially when missing chromosomes 1p and 19q."

This research was published in the February 19, 2008, issue of Neurology®, the medical journal of the American Academy of Neurology. The study was supported by a grant from the Delegation for Clinical Research in Paris.


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The above story is based on materials provided by American Academy of Neurology. Note: Materials may be edited for content and length.


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American Academy of Neurology. "Missing Chromosome Predicts Brain Tumor Patients' Response To Treatment." ScienceDaily. ScienceDaily, 21 February 2008. <www.sciencedaily.com/releases/2008/02/080218172535.htm>.
American Academy of Neurology. (2008, February 21). Missing Chromosome Predicts Brain Tumor Patients' Response To Treatment. ScienceDaily. Retrieved May 6, 2015 from www.sciencedaily.com/releases/2008/02/080218172535.htm
American Academy of Neurology. "Missing Chromosome Predicts Brain Tumor Patients' Response To Treatment." ScienceDaily. www.sciencedaily.com/releases/2008/02/080218172535.htm (accessed May 6, 2015).

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