Original Article · Originalarbeit

Dose-Escalated Conformal Radiotherapy of Glioblastomas – Results of a Retrospective Comparison Applying Radiation Doses of 60 and 70 Gy
R. Graf^a; B. Hildebrandt^b; W. Tilly^a; G. Sreenivasa^a; R. Ullrich^a; K. Maier-Hauff^c; R. Felix^a; P. Wust^a

^aCentre of Radiation Medicine, ^bMedical Clinic for Haematology and Oncology, ^cDepartment of Neurosurgery, Charité Medical School, Humboldt-University, Berlin, Germany

Onkologie 2005;28:325-330
(DOI: 10.1159/000085574)

  Summary

Background: Dose escalated three-dimensional conformal radiotherapy with 70 Gy against glioblastomas was compared retrospectively with the standard scheme of 60 Gy using 2-D-planning. Patients and Methods: In the period from 1994 to 1998, a series of 135 patients with glioblastomas was treated by surgery and postoperative radiotherapy. A conversion from 2-D into 3-D-planning was carried out in 4/1996. The prescribed total dose for the first 65 patients was 60 Gy (group 60). A boost up to 70 Gy was added for the remaining 70 patients (group 70). Results: The median survival time was 8.0 months for group 60 and 8.3 months for group 70. A dependency on the applied dose range was found. The median survival time was 3 months for patients who received a radiation dose of 55 Gy or less, 8.6 months for doses between 56 and 65 Gy, and 9.6 months for patients with a dose between 66 and 75 Gy (p < 0.01). In a multivariate analysis only the performance status maintained significance (p = 0.02) as a prognostic factor, while the dose range reached borderline significance (p = 0.09). Conclusion: No statistically significant survival prolongation was reached despite a dose escalation to 70 Gy.

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