Abstract:
:Radiotherapeutic doses for malignant gliomas are generally palliative because greater, supposedly curative doses would impart clinically unacceptable damage to nearby vital CNS tissues. To improve radiation treatment for human gliomas, we evaluated microbeam radiation therapy, which utilizes an array of parallel, microscopically thin (<100 microm) planar beams (microbeams) of synchrotron-generated X rays. Rats with i.c. 9L gliosarcoma tumors were exposed laterally to a single microbeam, 27 pm wide and 3.8 mm high, stepwise, to produce irradiation arrays with 50, 75, or 100 microm of on-center beam spacings and 150, 250, 300, or 500 Gy of in-slice, skin-entrance, single-exposure doses. The resulting array size was 9 mm wide and 10.4 mm high (using three 3.8-mm vertical tiers); the beam's median energy was -70 keV. When all data were collated, the median survival was 70 days; no depletion of nerve cells was observed. However, when data from the highest skin-entrance dose and/or the smallest microbeam spacings were excluded, the median survival time of the subset of rats was 170 days, and no white matter necrosis was observed. Others have reported unilateral single-exposure broad-beam irradiation of i.c. 9L gliosarcomas at 22.5 Gy with a median survival of only -34 days and with severe depletion of neurons. These results suggest that the therapeutic index of unidirectional microbeams is larger than that of the broad beams and that an application for microbeam radiation therapy in treating certain malignant brain tumors may be found in the future.
journal_name
Neuro Oncoljournal_title
Neuro-oncologyauthors
Dilmanian FA,Button TM,Le Duc G,Zhong N,Peña LA,Smith JA,Martinez SR,Bacarian T,Tammam J,Ren B,Farmer PM,Kalef-Ezra J,Micca PL,Nawrocky MM,Niederer JA,Recksiek FP,Fuchs A,Rosen EMdoi
10.1093/neuonc/4.1.26keywords:
subject
Has Abstractpub_date
2002-01-01 00:00:00pages
26-38issue
1eissn
1522-8517issn
1523-5866journal_volume
4pub_type
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