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'Chemo brain': Researchers identify physiological evidence of chemotherapy-induced changes in the brain

Date:
November 27, 2012
Source:
Radiological Society of North America
Summary:
Chemotherapy can induce changes in the brain that may affect concentration and memory, according to a new study. Using positron emission tomography combined with computed tomography, researchers were able to detect physiological evidence of chemo brain, a common side effect in patients undergoing chemotherapy for cancer treatment.
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If the map of the brain is divided down the middle and turned towards the sliced sides, the bright yellow and lime green hues in the left superior medial frontal gyrus sharply contrast the cool blue hues in the same region on the right side. The brain uses glucose as its energy supply. The bright colors represent large decreases in glucose usage by the brain.
Credit: Image courtesy of Radiological Society of North America

Chemotherapy can induce changes in the brain that may affect concentration and memory, according to a study presented today at the annual meeting of the Radiological Society of North America (RSNA). Using positron emission tomography combined with computed tomography (PET/CT), researchers were able to detect physiological evidence of chemo brain, a common side effect in patients undergoing chemotherapy for cancer treatment.

"The chemo brain phenomenon is described as 'mental fog' and 'loss of coping skills' by patients who receive chemotherapy," said Rachel A. Lagos, D.O., diagnostic radiology resident at the West Virginia University School of Medicine and West Virginia University Hospitals in Morgantown, W.V. "Because this is such a common patient complaint, healthcare providers have generically referred to its occurrence as 'chemo brain' for more than two decades."

While the complaint may be common, the cause of chemo brain phenomenon has been difficult to pinpoint. Some prior studies using magnetic resonance imaging (MRI) have found small changes in brain volume after chemotherapy, but no definitive link has been found.

Instead of studying chemotherapy's effect on the brain's appearance, Dr. Lagos and colleagues set out to identify its effect on brain function. By using PET/CT, they were able to assess changes to the brain's metabolism after chemotherapy.

"When we looked at the results, we were surprised at how obvious the changes were," Dr. Lagos said. "Chemo brain phenomenon is more than a feeling. It is not depression. It is a change in brain function observable on PET/CT brain imaging."

For the study, Dr. Lagos and colleagues analyzed PET/CT brain imaging results from 128 patients who had undergone chemotherapy for breast cancer. They used special software to help discern differences in brain metabolism before and after chemotherapy. Results were correlated with patient history, neurologic examinations and chemotherapy regimens.

PET/CT results demonstrated statistically significant decreases in regional brain metabolism that were closely associated with symptoms of chemo brain phenomenon.

"The study shows that there are specific areas of the brain that use less energy following chemotherapy," Dr. Lagos said. "These brain areas are the ones known to be responsible for planning and prioritizing."

Dr. Lagos believes that PET/CT could be used to help facilitate clinical diagnosis and allow for earlier intervention.

Research has already shown that patients with chemo brain can benefit from the assistance of nutritionists, exercise therapists, massage therapists and counselors. In one study, cancer patients receiving chemotherapy complained of losing their ability to prepare family meals.

"When the researchers provided these patients with written and planned menus for each meal, the women were able to buy the groceries, prepare the meals and enjoy them with their families," Dr. Lagos said.

Dr. Lagos and her fellow researchers hope that future studies will lead the way to better treatment for patients experiencing this often debilitating condition.

"The next step is to establish a prospective study that begins assessing new patients at the time of cancer diagnosis," she said. "The prospective study has the potential to establish an understanding of the change in brain neurotransmitters during chemotherapy, which may lead to improved treatment or prevention."

Coauthors are Jame Abraham, M.D., Gary Marano, M.D., Marc Haut, Ph.D., and Sara Kurian, M.S.


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The above post is reprinted from materials provided by Radiological Society of North America. Note: Materials may be edited for content and length.


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Radiological Society of North America. "'Chemo brain': Researchers identify physiological evidence of chemotherapy-induced changes in the brain." ScienceDaily. ScienceDaily, 27 November 2012. <www.sciencedaily.com/releases/2012/11/121127003324.htm>.
Radiological Society of North America. (2012, November 27). 'Chemo brain': Researchers identify physiological evidence of chemotherapy-induced changes in the brain. ScienceDaily. Retrieved August 30, 2015 from www.sciencedaily.com/releases/2012/11/121127003324.htm
Radiological Society of North America. "'Chemo brain': Researchers identify physiological evidence of chemotherapy-induced changes in the brain." ScienceDaily. www.sciencedaily.com/releases/2012/11/121127003324.htm (accessed August 30, 2015).

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