A Study of the Specificity and Sensitivity of 5- Aminolevulinic Acid (ALA) Fluorescence in Malignant Brain Tumors

Extent of resection is a very important prognostic factor affecting survival in individuals diagnosed with a malignant glioma. However, the infiltrative nature of the malignant glioma tumor cells produces indistinct borders between normal and malignant tissues, and the lack of easily identifiable tumor margins confounds attempts at total resection. The investigators propose to identify the borders of malignant gliomas intraoperatively using oral 5-aminolevulinic Acid (5-ALA) which results in fluorescence of the malignant cells and thereby provide an opportunity for more complete tumor resection. When exogenous 5-ALA is provided at increased concentration the tumor cells will become fluorescent under ultraviolet light. This feature identifies the tumor cells intraoperatively and facilitates complete resection. Data collection will include measurement of dose-limiting toxicity, tumor fluorescence, and tumor density. Data analysis will evaluate toxicity, sensitivity, and specificity of 5-ALA. Following completion of the phase 1 portion of this trial, an additional 14 subjects will be entered at the recommended phase 2 dose level in order to further define the above parameters at the recommended phase 2 dose level.