Abstract
Target population
These recommendations apply to adult patients diagnosed with newly diagnosed glioblastoma.
Question 1
In adult patients (aged 65 and under) with newly diagnosed glioblastoma, is the addition of radiation therapy (RT) more beneficial than management without RT in improving survival?
Recommendations
Level I: Radiation therapy (RT) is recommended for the treatment of newly diagnosed malignant glioblastoma in adults.
Question 2
In adult patients (aged 65 and under) with newly diagnosed glioblastoma, is the RT regimen of 60 Gy given in 2 Gy daily fractions more beneficial than alternative regimens in providing survival benefit while minimizing toxicity?
Recommendations
Level I: Treatment schemes should include dosage of up to 60 Gy given in 2 Gy daily fractions that includes the enhancing area.
Question 3
In adult patients (aged 65 and under) with newly diagnosed glioblastoma, is a tailored target volume superior to regional RT for reduction of radiation-induced toxicity while maintaining efficacy?
Recommendation
Level II: It is recommended that radiation therapy planning include 1–2 cm margin around the radiographically T1 weighted contrast-enhancing tumor volume or the T2 weighted abnormality on MRI.
Level III: Recalculation of the radiation volume during RT treatment may be necessary to reduce the radiated volume of normal brain since the volume of surgical defect will change during the long period of RT.
Question 4
In adult patients (aged 65 and under) with newly diagnosed glioblastoma, does the addition of RT of the subventricular zone to standard tumor volume treatment improve tumor control and overall survival?
Recommendation
No recommendation can be formulated as there is contradictory evidence in favor of and against intentional radiation of the subventricular zone (SVZ)
Question 5
In elderly (age > 65 years) and/or frail patients with newly diagnosed glioblastoma, does the addition of RT to surgical intervention improve disease control and overall survival?
Recommendation
Level I: Radiation therapy is recommended for treatment of elderly and frail patients with newly diagnosed glioblastoma to improve overall survival.
Question 6
In elderly (age > 65 years) and/or frail patients with newly diagnosed glioblastoma, does modification of RT dose and fractionation scheme from standard regimens decrease toxicity and improve disease control and survival?
Recommendation
Level II: Short RT treatment schemes are recommended in frail and elderly patients as compared to conventional 60 Gy given in 2 daily fractions because overall survival is not different while RT risk profile is better for the short RT scheme.
Level II: The 40.05 Gy dose given in 15 fractions or 25 Gy dose given in 5 fractions or 34 Gy dose given in 10 fractions should be considered as appropriate doses for Short RT treatments in elderly and/or frail patients.
Question 7
In adult patients with newly diagnosed glioblastoma is there advantage to delaying the initiation of RT instead of starting it 2 weeks after surgical intervention in decreasing radiation-induced toxicity and improving disease control and survival?
Recommendation
Level III: It is suggested that RT for patients with newly diagnosed GBM starts within 6 weeks of surgical intervention as compared to later times. There is insufficient evidence to recommend the optimal specific post-operative day within the 6 weeks interval to start RT for adult patients with newly diagnosed glioblastoma that have undergone surgical resection.
Question 8
In adult patients with newly diagnosed supratentorial glioblastoma is Image-Modulated RT (IMRT) or similar techniques as effective as standard regional RT in providing tumor control and improve survival?
Recommendation
Level III: There is no evidence that IMRT is a better RT delivering modality when compared to conventional RT in improving overall survival in adult patients with newly diagnosed glioblastoma. Hence, IMRT should not be preferred over the Conventional RT delivery modality.
Question 9
In adult patients with newly diagnosed glioblastoma does the use of radiosensitizers with RT improve the efficacy of RT as determined by disease control and overall survival?
Recommendation
Level III: Iododeoxyuridine is not recommended to be used as radiosensitizer during RT treatment for patients with newly diagnosed GBM
Question 10
In adult patients with newly diagnosed glioblastoma is the use of Ultrafractionated RT superior to standard fractionation regimens in improving disease control and survival?
Recommendation
There is insufficient evidence to formulate a recommendation regarding the use of ultrafractionated RT schemes and patient population that could benefit from it.
Question 11
In patients with poor prognosis with newly diagnosed glioblastoma is hypofractionated RT indicated instead of a standard fractionation regimen as measured by extent of toxicity, disease control and survival?
Recommendation
Level I: Hypofractionated RT schemes may be used for patients with poor prognosis and limited survival without compromising response. There is insufficient evidence in the literature for us to be able to recommend the optimal hypofractionated RT scheme that will confer longest overall survival and/or confer the same overall survival with less toxicities and shorter treatment time.
Question 12
In adult patients with newly diagnosed glioblastoma is the addition of brachytherapy to standard fractionated RT indicated to improve disease control and survival?
Recommendation
Level I: Brachytherapy as a boost to external beam RT has not been shown to be beneficial and is not recommended in the routine management of patients with newly diagnosed GBM.
Question 13
In elderly patients (> 65 year old) with newly diagnosed glioblastoma under what circumstances is accelerated hyperfractionated RT indicated instead of a standard fractionation regimen as measured by extent of toxicity, disease control and survival?
Recommendation
Level III: Accelerated Hyperfractionated RT with a total RT dose of 45 Gy or 48 Gy has been shown to shorten the treatment time without detriment in survival when compared to conventional external beam RT and should be considered as an option for treatment of elderly patients with newly diagnosed GBM.
Question 14
In adult patients with newly diagnosed glioblastoma is the addition of Stereotactic Radiosurgery (SRS) boost to conventional standard fractionated RT indicated to improve disease control and survival?
Recommendation
Level I: Stereotactic Radiosurgery boost to external beam RT has not been shown to be beneficial and is not recommended in patients undergoing routine management of newly diagnosed malignant glioma.
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Data Availability
All data are available by request.
Abbreviations
- AHRT:
-
Hypofractionated accelerated RT
- ART:
-
Accelerated radiation therapy
- Bx:
-
Biopsy
- CD:
-
Complete response
- CFRT:
-
Conventional fractionated radiation therapy
- CGE:
-
Cobalt grey equivalent
- CTV:
-
Clinical tumor volume
- EBRT:
-
External beam radiation therapy
- FRT:
-
Fractionated radiation therapy
- FSRT:
-
Fractionated stereotactic RT
- GBM:
-
Glioblastoma multiforme
- GTR:
-
Gross total resection
- GTV:
-
Gross tumor volume
- IMRT:
-
Intensity modulated radiation therapy
- MST:
-
Median survival time
- NTR:
-
Near total resection
- OS:
-
Overall survival
- PD:
-
Progressive disease
- PR:
-
Partial response
- PFS:
-
Progression free survival
- PTV:
-
Planning target volume
- RT:
-
Radiation therapy
- SD:
-
Stable disease
- SRT:
-
Stereotactic radiation therapy
- STR:
-
Subtotal resection
- SVZ:
-
Subventricular zone
- TM:
-
Tumor mass
- TMZ:
-
Temozolomide
- TTP:
-
Time to progression
- WBRT:
-
Whole brain radiation therapy
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Acknowledgements
We acknowledge the following individual peer reviewers of the Joint Guidelines Review Committee for their contributions to the development process: John O’Toole, MD, David Bauer, MD, Kimon Bekelis, MD, Andrew Carlson, MD, Isabelle Germano, MD, Catherine McClung Smith, MD, and Jonathan Sherman, MD
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This clinical systematic review and evidence-based guideline was developed by a multidisciplinary physician volunteer task force and serves as an educational tool designed to provide an accurate review of the subject matter covered. These guidelines are disseminated with the understanding that the recommendations by the authors and consultants who have collaborated in their development are not meant to replace the individualized care and treatment advice from a patient's physician(s). If medical advice or assistance is required, the services of a competent physician should be sought. The proposals contained in these guidelines may not be suitable for use in all circumstances. The choice to implement any particular recommendation contained in these guidelines must be made by a managing physician in light of the situation in each particular patient and on the basis of existing resources.
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Sponsored by: Congress of Neurological Surgeons Joint Section on Tumors. These guidelines were funded exclusively by the CNS Guidelines Committee and the AANS/CNS Joint Tumor Section Executive Committee with no funding from any outside commercial sources to support the development of this document.
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Mateo Ziu: None; Betty Y Kim: None; Wen Jiang: None; Timothy C. Ryken: None; Jeffrey J. Olson: American Cancer Society, Editorial Consultant. The Update on Newly Diagnosed Glioblastoma Task Force members were required to report all possible COIs prior to beginning work on the guideline, using the COI disclosure form of the AANS/CNS Joint Guidelines Committee, including potential COIs that are unrelated to the topic of the guideline. The CNS Guidelines Committee and Guideline Task Force Chair reviewed the disclosures and either approved or disapproved the nomination. The CNS Guidelines Committee and Guideline Task Force Chair are given latitude to approve nominations of Task Force Members with possible conflicts and address this by restricting the writing and reviewing privileges of that person to topics unrelated to the possible COIs.
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Ziu, M., Kim, B.Y.S., Jiang, W. et al. The role of radiation therapy in treatment of adults with newly diagnosed glioblastoma multiforme: a systematic review and evidence-based clinical practice guideline update. J Neurooncol 150, 215–267 (2020). https://doi.org/10.1007/s11060-020-03612-7
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DOI: https://doi.org/10.1007/s11060-020-03612-7