Navigation Links
Irradiating stem cell niche doubles survival in brain cancer patients
Date:7/23/2010

Patients with deadly glioblastomas who received high doses of radiation that hit a portion of the brain that harbors neural stem cells had double the progression-free survival time as patients who had lower doses or no radiation targeting the area, a study from the Radiation Oncology Department at UCLA's Jonsson Comprehensive Cancer Center has found.

Patients who underwent high doses of radiation that hit the specific neural stem cell site, known as the stem cell niche, experienced 15 months of progression-free survival, while patients receiving lower or no doses to this region experienced 7.2 months of progression-free survival, said Dr. Frank Pajonk, an associate professor of radiation oncology, a cancer center researcher and senior author of the study.

Pajonk said the study, published today in the early online edition of the journal BMC Cancer, could result in changes in the way radiation therapy is given to patients with these deadly brain cancers.

"Our study found that if you irradiated a part of the brain that was not necessarily part of the tumor the patients did better," Pajonk said. "We have been struggling for years to come up with new combinations of drugs and targeted therapies that would improve survival for patients with glioblastoma. It may be that by re-shaping our radiation techniques we can extend survival for these patients."

The retrospective study focused on the cases of 55 adult patients with grade 3 or grade 4 glioblastomas who received radiation at UCLA between February 2003 and May 2009. Pajonk said a prospective study is needed to confirm the results.

There is some evidence that many if not all cancers may spring from stem cells or progenitor cells that normally repair damage to the body, but that somehow become mutated and transform into cancer. In this case, Pajonk said the neural stem cell niche, called the periventricular region of the brain, may also be harboring stem cells that have transformed into brain cancer stem cells. However, the niche serves as a sort of safe harbor for the cancer stem cells, keeping them away from the site of the tumor but able to re-grow it once it's removed and the malignant areas of the brain have been treated.

Pajonk theorizes that the brain cancer stem cells in the patients whose niches were irradiated with higher doses may have been damaged or eliminated, giving these patients more time before their cancer recurred.

"This suggests that the neural stem cell niche in the brain may be harboring cancer stem cells, thus providing novel therapy targets," the study states. "We hypothesize that higher radiation doses to these niches improve patient survival by eradicating the cancer stem cells."

Glioblastomas are the deadliest form of brain cancer. Surgery, chemotherapy and radiation are not usually effective and life expectancy is about 12 to 18 months. New and more effective treatments are needed to help this patient population, Pajonk said.

The radiation therapy could damage neural stem cells as well as the cancer stem cells, Pajonk said, but those may be replaceable at some future date using induced pluripotent stem cells made from the patient's own cells. The induced pluripotent stem cells, which like embryonic stem cells can make every cell in the body, could be induced into becoming neural stem cells to replace those damaged or eradicated by the radiation to the niche.


'/>"/>

Contact: Kim Irwin
kirwin@mednet.ucla.edu
310-206-2805
University of California - Los Angeles
Source:Eurekalert

Related biology news :

1. Biogeography, changing climates and niche evolution
2. Stowers Institutes Linheng Li Lab expands understanding of bone marrow stem cell niche
3. Scientists demonstrate importance of niche differences in biodiversity
4. Gaining too much weight during pregnancy nearly doubles risk of having a heavy baby
5. Brain-controlled cursor doubles as a neural workout
6. Sex on the brain: Doublesex gene key to determining fruit fly gender
7. Second lumpectomy for breast cancer reduces survival rates
8. U of MN study shows link between gene variations and cancer survival
9. Similar survival rates for Pacific salmon in Fraser, Columbia Rivers raises new questions
10. Research challenges conventional notions about salmon survival
11. Salmon smolt survival similar in Columbia and Fraser rivers
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:3/31/2016)... BOCA RATON, Florida , March 31, 2016 /PRNewswire/ ... LEGX ) ("LegacyXChange" or the "Company") ... presentation for potential users of its soon to be ... The video ( https://www.youtube.com/channel/UCyTLBzmZogV1y2D6bDkBX5g ) will also ... by the use of DNA technology to an industry ...
(Date:3/22/2016)... Ontario , PROVO and ... Newborn Screening Ontario (NSO), which operates the ... for molecular testing, and Tute Genomics and UNIConnect, ... management technology respectively, today announced the launch of a ... next-generation sequencing (NGS) testing panel. NSO ...
(Date:3/15/2016)... 2016 Yissum Research Development Company of ... of the Hebrew University, announced today the formation of ... of various human biological indicators. Neteera Technologies has completed ... private investors. ... of electromagnetic emissions from sweat ducts, enables reliable and ...
Breaking Biology News(10 mins):
(Date:4/28/2016)... NEW YORK , April 28, 2016 /PRNewswire/ ... biotechnology acceleration company reports the Company,s CEO  was ... capital titled Accelerators Enter When VCs Fear To ... Life Science Leader magazine is an ... work for everything from emerging biotechs to Big ...
(Date:4/28/2016)... ... April 28, 2016 , ... Next week on May ... its first-in-class technologies for tissue stem cell counting and expansion to gene-editing scientists ... Reprogramming & CRISPR-based Genome Engineering in Burlington, Massachusetts. , The attention of most ...
(Date:4/28/2016)... , ... April 28, 2016 , ... ... will hold an open house for regional manufacturers at its Maple Grove, Minnesota ... Tsugami, Okuma, Hardinge Group, Chiron and Trumpf. Almost 20 leading suppliers of ...
(Date:4/27/2016)... ... April 27, 2016 , ... Shimadzu Scientific ... the Spring 2016 Marijuana Business Conference and Expo. Shimadzu’s high-performance instruments enable laboratories ... and more. Expo attendees can stop by booth 1021 to learn how Shimadzu’s ...
Breaking Biology Technology: