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Targeted Radiosurgery More Effective in Treating Metastatic Brain Tumors

by Dr. Trupti Shirole on February 22, 2017 at 3:17 AM
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 Targeted Radiosurgery More Effective in Treating Metastatic Brain Tumors

Metastatic brain tumors, that originate in other organs of the body and spread to the brain, affect as many as 300,000 people each year, suggests the American Brain Tumor Association.

University of Missouri School of Medicine researchers compared two common post surgical therapies for metastatic brain tumors and found that stereotactic radiosurgery can provide better outcomes for patients compared to whole-brain radiation.

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During whole-brain radiation therapy, beams of radiation cover the entire brain. Because it treats the whole brain, the therapy is thought to control the spread of tumors by treating both identifiable and hidden cancerous cells. However, whole-brain radiation has been associated with a decline in cognitive functions that can negatively affect a patient's quality of life.

In stereotactic radiosurgery, radiation is delivered to more precise areas of the brain. Because it is a targeted therapy, less collateral damage occurs to healthy brain tissue. As a result, patients experience less cognitive decline when compared to whole-brain radiation, and experience a higher quality of life.
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"Although radiosurgery has been shown to be an effective post-surgical treatment for metastatic brain tumors, previous studies did not compare patient outcomes from a single hospital over the same period of time," said N. Scott Litofsky, chief of the Division of Neurological Surgery at the MU School of Medicine and senior author of the study. "Our study is one of the first to directly compare outcomes of patients treated at the same hospital during a set period of time. Ultimately, our findings reinforce the use of radiosurgery over whole-brain radiation."

Under Litofsky's mentorship, Kristen Scheitler-Ring, a medical student doing a pathology fellowship at the MU School of Medicine, studied the outcomes of patients treated at MU Health Care from 2010 to 2014. After undergoing brain surgery to remove a metastatic tumor, 46 patients received whole-brain radiation, while 37 patients received radiosurgery. The researchers found that radiosurgery controlled the spread of the cancerous cells as effectively as whole-brain radiation; patients who received radiosurgery experienced less cognitive decline compared to those who received whole-brain radiation. Additionally, the median survival rate for patients who received radiosurgery was 440 days, compared to 202 days for patients who received whole-brain radiation.

"For patients with metastatic cancer of the brain, the importance of surviving for a longer period of time cannot be overstated," Litofsky said. "In our practice, we now treat patients almost exclusively with radiosurgery following their surgery. Although this therapy does cost more, results often can be achieved in one to three visits compared to 10 to 12 visits for whole-brain radiation. With these considerations, we strongly suggest physicians consider radiosurgery as an initial radiation treatment after surgery."

Source: Eurekalert
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