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Cancer cells' DNA repair disrupted to increase radiation sensitivity
Date:12/1/2011

eserve genetic stability. In telomere-shortened cancer cells, the compacted chromatin inhibited ATM signaling to all of the chromatin-bound targets tested in the study. This disrupted DNA repair responses and increased radiation sensitivity.

Testing brain cancer cells

The researchers are now testing their findings in cells from hard-to-treat pediatric brain tumors. These tests begin as Drissi's laboratory also leads correlative cancer biology studies of tumor samples from a current clinical trial. The trial is evaluating telomere shortening as a stand-alone therapy for pediatric cancers.

Managed through the National Institutes of Health's Children's Oncology Group (COG), the multi-institutional Phase 1 trial is testing the safety and tumor response capabilities of the drug Imetelstat, which blocks telomerase in cancer cells. Drissi serves on the clinical trial committee along with Maryam Fouladi, MD, MSc, and medical director of Neuro-Oncology at Cincinnati Children's. She leads the medical center's clinical participation in the trial.

Drissi and Fouladi are starting preparatory work to develop, and seek approvals for, a possible clinical trial to test telomere shortening and radiation treatment as a safer, more effective treatment for pediatric brain tumors.


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Contact: Nick Miller
nicholas.miller@cchmc.org
513-803-6035
Cincinnati Children's Hospital Medical Center
Source:Eurekalert

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Amylase (EPS-G7, kinetics), Wavelength: 405 nm. Linear range; 5-1500 IU/L....
g-GT Liquid Reagent (Kinetic Method). Wavelength: 405 nm. Linear range: 0-200 U/mL. Prepare Working Reagent in the ratio of 5 parts R1 to 1 part of R2, (i.e., 50 mL R1 and 10 mL R2)....
Intended for the quantitative determination of calcium in serum. Endpoint Reaction. Reaction complete within one minute, color developed is stable for 30 minutes. Wavelength: 570 nm. Linearity: 16 mg...
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