Patients with deadly glioblastomas who received high doses of radiation that hit a portion of the brain which 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 University of California Los Angele’s (UCLA's) Jonsson Comprehensive Cancer Center has found.
Those who underwent 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 the study's senior author, Dr. Frank Pajonk (pictured), an associate professor of radiation oncology and a Jonsson Cancer Center researcher.
Pajonk said the study could result in changes to 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 reshaping 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. The niche serves as a sort of safe harbor for the cancer stem cells, keeping them away from the site of the tumor and preserving their ability to regrow the tumor once it has been removed and the malignant areas of the brain have been treated.
Pajonk theorizes that brain cancer stem cells in 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. 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 radiation to the niche.
Illustration: University of California Los Angeles.
University of California Los Angeles Newsroom (07/23/10)
Science Daily (07/26/10)
Abstract (BMC Cancer. 2010 Jul 21;10:384)