Irradiation of intracerebral 9L gliosarcoma by a single array of microplanar x-ray beams from a synchrotron: balance between curing and sparing

Regnard, Pierrick; Le Duc, Géraldine; Bräuer-Krisch, Elke; Troprès, Irène; Siegbahn, Erik Albert; Kusak, Audrey; Clair, Charlotte; Bernard, Hélène; Dallery, Dominique; Laissue, Jean A; Bravin, Alberto (2008). Irradiation of intracerebral 9L gliosarcoma by a single array of microplanar x-ray beams from a synchrotron: balance between curing and sparing. Physics in medicine and biology, 53(4), pp. 861-78. Bristol: Institute of Physics Publishing IOP 10.1088/0031-9155/53/4/003

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The purpose of this work was the understanding of microbeam radiation therapy at the ESRF in order to find the best compromise between curing of tumors and sparing of normal tissues, to obtain a better understanding of survival curves and to report its efficiency. This method uses synchrotron-generated x-ray microbeams. Rats were implanted with 9L gliosarcomas and the tumors were diagnosed by MRI. They were irradiated 14 days after implantation by arrays of 25 microm wide microbeams in unidirectional mode, with a skin entrance dose of 625 Gy. The effect of using 200 or 100 microm center-to-center spacing between the microbeams was compared. The median survival time (post-implantation) was 40 and 67 days at 200 and 100 microm spacing, respectively. However, 72% of rats irradiated at 100 microm spacing showed abnormal clinical signs and weight patterns, whereas only 12% of rats were affected at 200 microm spacing. In parallel, histological lesions of the normal brain were found in the 100 microm series only. Although the increase in lifespan was equal to 273% and 102% for the 100 and 200 microm series, respectively, the 200 microm spacing protocol provides a better sparing of healthy tissue and may prove useful in combination with other radiation modalities or additional drugs.

Item Type:	Journal Article (Original Article)
Division/Institute:	04 Faculty of Medicine > Service Sector > Institute of Pathology
UniBE Contributor:	Laissue, Jean
ISSN:	0031-9155
ISBN:	18263945
Publisher:	Institute of Physics Publishing IOP
Language:	English
Submitter:	Factscience Import
Date Deposited:	04 Oct 2013 15:03
Last Modified:	05 Dec 2022 14:19
Publisher DOI:	10.1088/0031-9155/53/4/003
PubMed ID:	18263945
Web of Science ID:	000254175400004
URI:	https://boris.unibe.ch/id/eprint/27355 (FactScience: 106369)