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Stereotactic LINAC radiosurgery for incompletely resected or recurrent atypical and anaplastic meningiomas

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Abstract

Background

The optimal management of subtotally resected or recurrent malignant meningiomas remains controversial. We evaluated the efficacy of linear accelerator (LINAC) radiosurgery for atypical and anaplastic meningiomas after incomplete resection or treatment of recurrences.

Methods

Between August 1990 and December 2003, 16 patients with 28 meningiomas WHO II and III were treated by stereotactic LINAC radiosurgery at our institution. The median radiological follow-up was 60.3 months, respectively (range: 7.2–173.9 months). Fourteen tumors in nine patients were classified as WHO II and 14 tumors in seven patients as WHO III. The median surface dose was 14 Gy (range: 10–15 Gy) with a median tumor volume of 4.8 ml (range: 0.51–51.4 ml).

Results

Clinical condition improved in four patients, remained unchanged in nine and deteriorated in one. Tumor shrinkage was seen in eight of 28 meningiomas and a stable disease in 12. Eight of 28 meningiomas showed local tumor progression. The overall tumor control rate (TCR) was 84%, 70%, 70% after 3, 5, 10 years. According to grading the corresponding TCR after 3, 5, 10 years was 91%, 81%, 81% for grade II and 77%, 60%, 60% for grade III meningiomas. Overall progression-free survival (PFS) was 74%, 67%, 58% after 3, 5, 10 years. According to grading the PFS after 3, 5, 10 years was 88%, 75%, 75% for grade II meningiomas and 57%, 57%, 43% for grade III meningiomas.

Conclusion

Our results show the efficacy and safety of LINAC radiosurgery for incompletely resected or recurrent malignant meningiomas with a relatively high local tumor control and low morbidity.

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Correspondence to Mohammad Maarouf.

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Comment

The authors presented a small series of 16 patients who had stereotactic radiosurgery for residual or recurrent atypical or anaplastic meningiomas. They achieved impressive long-term tumour control, as shown by overall progression free survival. These are patients with rather challenging pathologies, particularly due to the widespread and multiple nature of the disease.

Their results are approximately in keeping with similar studies in the literature, although the 10-year results appear to be much better than that published elsewhere. If proven by larger studies, this paper would indicate that our therapeutic pessimism may have to be revised and focal radiosurgical treatment may be offered.

Andras Kemeny

Sheffield, UK

Mustapha El-Khatib and Faycal El Majdoub contributed equally to theis study

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El-Khatib, M., El Majdoub, F., Hoevels, M. et al. Stereotactic LINAC radiosurgery for incompletely resected or recurrent atypical and anaplastic meningiomas. Acta Neurochir 153, 1761–1767 (2011). https://doi.org/10.1007/s00701-011-1073-7

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  • DOI: https://doi.org/10.1007/s00701-011-1073-7

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