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5-ALA fluorescence guides resection of recurrent glioblastoma multiforme
Date:2/19/2013

three new lesions. To aid in visualization of the lesions intraoperatively, the neurosurgical team, led by Mitchel S. Berger, M.D., Chairman of the Department of Neurological Surgery at UC San Francisco, administered 5-ALA to the patient four hours prior to surgery. During surgery, a blue light was used to activate 5-ALA fluorescence of tumor cells and thus differentiate tumor from other brain tissue. Using the blue light, the surgeons were able to detect tumor cells along the lining of the right lateral ventricle, in the ependymal and subependymal regions. Although the appearance of the three lesions on preoperative MRI had indicated distinct sites of recurrent disease (multicentric tumor recurrence), the fluorescence of tumor cells during surgery mapped out the spread of disease from the original GBM site in the right occipital lobe to three sites in the right temporal lobe through a pathway along the wall of the right ventricle. This showed that the GBM recurrence was not multicentric at all. The fluorescence also made it possible for the surgeons to identify and resect additional tumor tissue along the pathway between the original and recurrent lesions.

According to the authors, MRI is unable to clearly delineate diffuse tumor infiltrating the ependyma and subependymal zone lining the lateral ventricle. Addition of 5-ALA fluorescence during surgery revealed the pathway of tumor spread through these regions.

With recurrent GBM, it is valuable to distinguish whether the recurrence is multicentric disease or infiltrative disease extending from the original tumor. According to Dr. Berger, "Multicentric disease can add a worse prognosis. Finding it during surgery is important and can influence the extent of resection." Addition of 5-ALA fluorescence has been identified as substantially increasing the success of achieving maximum resection. Dr. Berger says that intraoperative use of 5-ALA "could be useful in all GBM cases."


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Contact: Jo Ann M Eliason
jaeliason@thejns.org
434-982-1209
Journal of Neurosurgery Publishing Group
Source:Eurekalert

Page: 1 2

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