Abstract
Background
Only few data are available on the specific topic of 5-aminolevulinic acid (5-ALA) guided surgery of high-grade gliomas (HGG) located in eloquent areas. Studies focusing specifically on the post-operative clinical outcome of such patients are yet not available, and it has not been so far explored whether such approach could be more suitable for some particular subgroups of patients.
Methods
Patients affected by HGG in eloquent areas who underwent surgery assisted by 5-ALA fluorescence and intra-operative monitoring were prospectively recruited in our Department between June 2011 and August 2012. Resection rate was reported as complete resection of enhancing tumor (CRET), gross total resection (GTR) >98 % and GTR > 90 %. Clinical outcome was evaluated at 7, 30, and 90 days after surgery.
Results
Thirty-one patients were enrolled. Resection was complete (CRET) in 74 % of patients. Tumor removal was stopped to avoid neurological impairment in 26 % of cases. GTR > 98 % and GTR > 90 % was achieved in 93 % and 100 % of cases, respectively. First surgery and awake surgery had a CRET rate of 80 % and 83 %, respectively. Even though at the first-week assessment 64 % of patients presented neurological impairment, there was a 3 % rate of severe morbidity at the 90th day assessment. Newly diagnosed patients had a significantly lower morbidity (0 %) and post-operative higher median KPS. Both pre-operative neurological condition and improvement after corticosteroids resulted significantly predictive of post-operative functional outcome.
Conclusions
5-ALA surgery assisted by functional mapping makes high HGG resection in eloquent areas feasible , through a reasonable rate of late morbidity. This emerges even more remarkably for selected patients.
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Della Puppa and co-workers combine two modern techniques for malignant glioma surgery, intra-operative mapping/monitoring, and fluorescence-guidance with ALA (Gliolan®). They demonstrate that given modern methods for identifying tumor intra-operatively, function limits resection. Combining both techniques will result in a high rate of complete resections of contrast-enhancing tumors even in a population of patients with gliomas in critical brain areas, with acceptable temporary morbidity. Surgery with methods for resection optimization (ALA, intra-op MRI or a combination) as well as methods for maintaining function should be considered standard for these patients, where there is often a small margin between benefits and pitfalls from what neurosurgeons are doing and safe maximal resection is the goal.
W Stummer
Münster, Germany
No funding was received for both this study and 5-ALA supply
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Della Puppa, A., De Pellegrin, S., d’Avella, E. et al. 5-aminolevulinic acid (5-ALA) fluorescence guided surgery of high-grade gliomas in eloquent areas assisted by functional mapping. Our experience and review of the literature. Acta Neurochir 155, 965–972 (2013). https://doi.org/10.1007/s00701-013-1660-x
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DOI: https://doi.org/10.1007/s00701-013-1660-x