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Die rolle der strahlentherapie in der behandlung maligner meningiome

The potential role of radiation therapy for the treatment of malignant meningiomas

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Abstract

Fragestellung

Maligne Meningiome weisen ohne additive Therapie nach chirurgischer Intervention eine hohe Lokalrezidivrate auf. über die Stellung der Strahlentherapie und die benötigte Dosis als additive TherapiemodalitÄt liegen nur wenige Daten vor. Mittels dieser Studie sollte die Rolle der Strahlentherapie mit Zielvolumendosen > -60 Gy/CGE in der Behandlung von malignen Meningiomen untersucht werden.

Patienten und Methoden

Die Daten von 16 Patienten mit histologisch gesicherten malignen Meningiomen, die sich zwischen 1974 und 1995 einer Strahlentherapie unterzogen, wurden retrospektiv analysiert. Das Alter bei Diagnosestellung betrug zwischen sechs und 79 Jahren (Mittel 49 Jahre). Drei Patienten entwickelten ein malignes Meningiom mehr als 14 Jahre nach einer Strahlentherapie im SchÄdelbereich. Bei zehn Patienten wurde ein PrimÄrtumor, bei sechs ein Rezidivtumor behandelt. Sechs Patienten hatte eine totale, zehn Patienten eine subtotale Tumorresektion. Die Bestrahlung erfolgte entweder als alleinige Photonentherapie oder als kombinierte Protonen/Photonen-Therapie. Fast alle Patienten, eine Ausnahme, erhielten im Zielvolumen eine Dosis zwischen 40 und 72 Gy/CGE (Mittel: 58 Gy/CGE).

Ergebnisse

Die mittlere Beobachtungszeit betrug 59 Monate (zehn bis 155 Monate). Die lokale Tumorkontrollrate lag nach fünf bzw. acht Jahren bei 52% bzw. 17%. Bei Zielvolumendosen > 60 Gy/CGE zeigte sich eine signifikante Verbesserung der lokalen Tumorkontrolle (100% versus 17%, p = 0,0006) und der Fünf-Jahres-überlebensrate (87% versus 15%, p = 0,025). Zum Zeitpunkt der Analyse lebten 6/16 Patienten (38%). Zwei Patienten entwickelten symptomatische SpÄteffekte bei Dosen von 59,3 und 72 Gy/CGE nach Ende der Strahlentherapie.

SchluΒfolgerung

Eine konformale Strahlentherapie mit Dosen > - 60 Gy/CGE führte zu einer signifikanten Verbesserung der lokalen Tumorkontrolle und damit letztendlich zu einer Verbesserung der überlebenszeiten.

Abstract

Purpose

Most malignant meningiomas will recur following surgical resection only. The role of irradiation and radiation dose levels is poorly defined. This study reviews a single institution experience using both, conventional and high doses > 60 Gy/CGE radiation regimen.

Patients and Methods

Between 1974 and 1995 16 patients with histologically proven malignant meningioma underwent radiation therapy (RT). Age at diagnosis ranged between 6 and 79 years (median: 49 years). Three patients reported previous irradiation to the head at least 14 years prior to diagnosis. Ten patients were treated for primary, and 6 patients for recurrent disease. Six patients underwent gross total and 10 patients subtotal resection (Table 1). RT was delivered using conventional, megavoltage photons or combined 160 MeV proton and photon irradiation. Except 1 patient, who died during RT, the radiation doses ranged between 40 and 70 Gy/CGE (= Cobalt Gray Equivalent) (median: 58 Gy/CGE, Table 2).

Results

With median observation time of 59 months (range: 10 to 155 months), actuarial local control rates at 5 and 8 years were 52% and 17%, respectively. Target doses > -60 Gy/CGE resulted in significantly improved tumor control (100%) compared to < 60 Gy/CGE (17%) (p = 0.0006, Table 3 and Figure 1). Improved local control translated also in increased overall survival: 87% (> 60 Gy/CGE) versus 15% (< 60 Gy/CGE) at 5 years (p = 0.025, Figure 2). At time of analysis, 6/16 patients (38%) were alive. Two patients developed symptomatic brain damage at doses of 59.3 and 72 Gy/CGE.

Conclusion

Conformal, radiation therapy with target doses > 60 Gy/CGE, in this study by use of combined proton and photon irradiation, can significantly improve chances of long-term local control and survival for patients diagnosed with these challenging tumors.

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DeVries, A., Munzenrider, J.E., Hedley-Whyte, T. et al. Die rolle der strahlentherapie in der behandlung maligner meningiome. Strahlenther Onkol 175, 62–67 (1999). https://doi.org/10.1007/BF02753844

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  • DOI: https://doi.org/10.1007/BF02753844

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