Abstract
Question
Should patients with imaging suggestive of low grade glioma (LGG) undergo observation versus treatment involving a surgical procedure?
Target population
These recommendations apply to adults with imaging suggestive of a WHO grade 2 glioma (oligodendroglioma, astrocytoma, or oligo-astrocytoma).
Recommendations
Surgical resection is recommended over observation to improve overall survival for patients with diffuse low-grade glioma (Level III) although observation has no negative impact on cognitive performance and quality of life (Level II).
Question
What is the impact of extent of resection on progression free survival (PFS) or overall survival (OS) in LGG patients?
Target population
These recommendations apply to adults with imaging suggestive of a WHO grade 2 glioma (oligodendroglioma, astrocytoma, or oligo-astrocytoma).
Recommendations
Impact of extent of resection on PFS
Level II
It is recommended that GTR or STR be accomplished instead of biopsy alone when safe and feasible so as to decrease the frequency of tumor progression recognizing that the rate of progression after GTR is fairly high.
Impact of extent of resection on OS
Level III
Greater extent of resection can improve OS in LGG patients.
Question
What tools are available to increase extent of resection in LGG patients?
Target population
These recommendations apply to adults with imaging suggestive of a WHO grade 2 glioma (oligodendroglioma, astrocytoma, or oligo-astrocytoma).
Recommendations
Intraoperative MRI during surgery
Level III
The use of intraoperative MRI should be considered as a method of increasing the extent of resection of LGGs.
Question
What is the impact of surgical resection on seizure control and accuracy of pathology in low grade glioma patients?
Target population
These recommendations apply to adults with imaging suggestive of a WHO grade 2 glioma (oligodendroglioma, astrocytoma, or oligo-astrocytoma).
Recommendations
Surgical resection and seizure control
Level III
After taking into account the patient’s clinical status and tumor location, gross total resection is recommended for patients with diffuse LGG as a way to achieve more favorable seizure control.
Accuracy of diagnosis
Level III
Taking into account the patient’s clinical status and tumor location, surgical resection should be carried out to maximize the chance of accurate diagnosis.
Question
What tools can improve the safety of surgery for LGGs in eloquent locations?
Target population
These recommendations apply to adults with imaging suggestive of a WHO grade 2 glioma (oligodendroglioma, astrocytoma, or oligo-astrocytoma).
Recommendations
Preoperative imaging
Level III
It is recommended that preoperative functional MRI and diffusion tensor imaging be utilized in the appropriate clinical setting to improve functional outcome after surgery for LGG.
Intraoperative Mapping of Tumors in Eloquent Areas
Level III
Intraoperative mapping is recommended for patients with diffuse LGGs in eloquent locations compared to patients with non-eloquently located diffuse LGGs as a way of preserving function.
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Acknowledgments
We acknowledge the significant contributions of Laura Mitchell, Senior Manager of Guidelines for the Congress of Neurological Surgeons; the Joint Guidelines Committee (JGC) of the American Association of Neurological Surgeons and the Congress of Neurological Surgeons for their review, comments and suggestions; Jeffrey Wagner and Sung Won Han for assistance with data collection and compilation and Anne Woznica and Mary Bodach for their assistance with the literature searches. We also acknowledge the following individual JGC members for their contributions throughout the review process: Kevin Cockroft, MD, Sepideh Amin-Hanjani, MD, Kimon Bekelis, MD, Isabelle Germano, MD, Daniel Hoh, MD, Steven Hwang, MD, Cheerag Dipakkumar Upadhyaya, MD, Christopher Winfree, MD, and Brad Zacharia, MD.
Disclosures
Dr. Kalkanis is a consultant for Arbor and Varian. Dr. Olson is a consultant for the American Cancer Society; has received research funding from the National Cancer Institute, Genentech, and Millenium; and has received investigational drug provision from Merck.
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Aghi, M.K., Nahed, B.V., Sloan, A.E. et al. The role of surgery in the management of patients with diffuse low grade glioma. J Neurooncol 125, 503–530 (2015). https://doi.org/10.1007/s11060-015-1867-1
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DOI: https://doi.org/10.1007/s11060-015-1867-1