1. Radiotherapy in Supratentorial Gliomas
- Author
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Willemina M. Molenaar, Gwan K. Go, and Mart A. A. M. Heesters
- Subjects
Oncology ,Time Factors ,medicine.medical_treatment ,Brachytherapy ,GLIOBLASTOMA-MULTIFORME ,RANDOMIZED TRIAL ,PROGNOSTIC-FACTORS ,POSTOPERATIVE RADIOTHERAPY ,EUROPEAN ORGANIZATION ,Risk Factors ,glioma ,Oligodendroglial Tumor ,Neurologic Examination ,LOW-GRADE GLIOMAS ,Age Factors ,Astrocytoma ,Radiotherapy Dosage ,Middle Aged ,Prognosis ,MALIGNANT GLIOMA ,Treatment Outcome ,Data Interpretation, Statistical ,Adult ,medicine.medical_specialty ,Gliosarcoma ,Adolescent ,Oligodendroglioma ,survival ,RADIATION-THERAPY ,Glioma ,Internal medicine ,medicine ,Humans ,THERAPY-ONCOLOGY-GROUP ,Radiology, Nuclear Medicine and imaging ,MEDICAL-RESEARCH-COUNCIL ,radiotherapy ,Survival analysis ,Retrospective Studies ,business.industry ,Radiotherapy Planning, Computer-Assisted ,Supratentorial Neoplasms ,medicine.disease ,Survival Analysis ,Surgery ,Radiation therapy ,Neoplasm Recurrence, Local ,Glioblastoma ,business ,Follow-Up Studies ,Anaplastic astrocytoma - Abstract
Purpose: Analysis of the results of radiotherapy in a Large group of cerebral gliomas with identification of prognostic factors and the outcome with respect to different decades of treatment.Patients and Methods: Two decades (1979-1999) of radiotherapy in supratentorial astrocytic and oligodendroglial tumors (n = 821) at the University Hospital Groningen were retrospectively evaluated. Prognostic factors for survival were analyzed. Two decades of radiotherapy treatment were compared with respect to radiotherapy dose and treatment-field design.Results: Glioblastoma multiforme, including gliosarcoma, was the most frequent supratentorial glioma (n = 442) with a poor survival, i.e., median survival time (MST) 7 months, especially in patients > 50 years of age and with poor performance. Patients with good performance were selected for radiotherapy with an optimum dose of 60 Gy local-field irradiation. However, in patients with poor prognosis, no radiotherapy was applied or a shorter treatment scheme was given. Anaplastic astrocytomas (n = 131) were treated in the same way as glioblastoma multiforme. Over time, a decrease in radiation dose (from 60 to 45 Gy) and from whole brain irradiation to local-field treatment was observed, following the literature. In low-grade gliomas, prognostic factors for survival were age, performance, and extent of resection. Gemistocytic astrocytoma (n = 15) had an inferior survival compared to astrocytoma (MST 46 vs. 54 months), but a superior survival compared to anaplastic astrocytoma (MST 10 months). The presence of an oligodendroglial component in a glioma implied a superior survival compared to the astrocytic gLiomas. The inherent biology of the glioma is reflected by the study of recurrent tumors with progression to higher grades of malignancy in 32-40% and by the histology of recurrent oligodendroglial tumors. In comparing two decades of radiotherapy in gliomas, no differences in survival were observed despite the technological improvements. However, reduction in Long-term side effects was not evaluated, especially in Low-grade gLiomas which were treated in the second decade of the study with Local fields only and a reduced radiotherapy dose using computerized three-dimensional (3-D) planning.Conclusion: Radiotherapy does not cure cerebral glioma. Prognostic factors for survival are histopathologic classification and grading, age, and patient performance. Technological improvements do not improve survival, but possibly reduce late effects.
- Published
- 2003
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