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Spinal cord mass arising from neural stem cell therapy
Date:7/8/2014

inal canal at the site of injury. Eight years after the experimental therapy, the woman sought medical care for mid- to lower-back pain at the University of Iowa Hospitals and Clinics. On neurological examination, she showed no sign of clinical improvement from the olfactory mucosal cell implantation, and imaging studies revealed a mass in her spinal canal pressing against the spinal cord. This mass was the source of the patient's pain.

Following surgery to remove the symptom-producing mass at the University of Iowa, a tissue analysis showed that the mass contained a small proportion of nonfunctional tiny nerve branches, whose appearance led the authors to suspect the nerve branches developed from transplanted neural stem-like cells. The tissue analysis also demonstrated that most of the mass consisted of multiple cysts lined with respiratory mucosa and underlying submucosal glands and goblet cells. Abundant mucus-like material was also found in the mass. Accumulation of this material over time produced the patient's symptoms.

The authors describe various ways of extracting olfactory mucosa cells for implantation. In this particular case, a portion of olfactory mucosa was transplanted; in other trials, olfactory ensheathing cells have been extracted from olfactory mucosa and purified prior to implantation. The authors suggest that the choice of bulk olfactory mucosa rather than purified olfactory ensheathing cells or stem cells as an autograft may lead to the development of a mass containing functional respiratory mucosal cells.

The authors point out that a rare case of spinal cord complication such as this should not discourage stem cell research and/or the transition of promising research to the clinical setting. However, the authors indicate the need for a better understanding of what can occur and urge clinicians to extend the monitoring period in patients treated with neural stem cell therapy for many years in case an adverse event s
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Contact: Jo Ann Eliason
jaeliason@thejns.org
434-982-1209
Journal of Neurosurgery Publishing Group
Source:Eurekalert

Page: 1 2 3

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