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Interstitial brachytherapy for low-grade cerebral gliomas: Analysis of results in a series of 36 cases

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Summary

The results obtained with interstitial brachytherapy in thirty-six low-grade cerebral gliomas (2 pilocytic astrocytomas, 23 astrocytomas and 11 oligodendrogliomas) are reported (mean follow-up: 75 months, range 37–159). All tumours were situated in locations which did not call for surgical removal as the treatment of choice. Their volume ranged from 4 to 82 cc (m=32); the Karnofsky performance status (KPS) of the treated patients lay between 0.60 and 0.90.

The sources utilized (Iridium-192 in 32 cases and Iodine-125 in 4) were implanted permanently in 22 patients and temporarily in 14, using the Talairach stereotactic apparatus. The mean peripheral dose was 89.7 Gy for the permanent implants and and 42.8 Gy with a rate of 32.05 cGy/h for the temporary implants. External beam irradiation was added for tumour volumes greater than 35 cc (19 cases) on a second target volume extending 2 cm beyond the tumoural borders treated with interstitial irradiation.

The survival estimates for the entire group showed a probability of 82.9% at 60 months, of 56.8% at 96, 39.4% at 120 (m.s.t.: 112 months). The quality of life in the treated patients was satisfactory, KPS never falling below a mean score of 0.70. The extent of the target volume turned out to be the most significant factor influencing survival at the multivariate analysis. Severe neurological impairment due to radionecrosis occurred in 4 patients (11%), three of them requiring surgical decompression. Target volume and radiation dose showed a direct correlation with the risk of radionecrosis at the regression analysis, the critical values being 35 cc and 100 Gy (permanent implants) or 50 Gy (42 cGy/h, temporary implants) respectively. The analysis of the results indicates that, even though many questions still remain open, brachytherapy can represent a valid alternative to surgery for tumours not suitable for surgical removal.

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Authors and Affiliations

  1. Institutes of Neurosurgery, Catholic University, Rome, Italy

    M. Scerrati, M. Iacoangeli, R. Roselli & G. F. Rossi

  2. Institutes of Radiology, Catholic University, Rome, Italy

    P. Montemaggi

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Study partially supported by a grant from the Italian Ministry of University and of Scientific and Technological Research.

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Scerrati, M., Montemaggi, P., Iacoangeli, M. et al. Interstitial brachytherapy for low-grade cerebral gliomas: Analysis of results in a series of 36 cases. Acta neurochir 131, 97–105 (1994). https://doi.org/10.1007/BF01401459

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