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/sup 125/I interstitial implants in the RIF-1 murine flank tumor: an animal model for brachytherapy

Journal Article · · Radiat. Res.; (United States)
DOI:https://doi.org/10.2307/3575897· OSTI ID:6707973
The development of a model for interstitial brachytherapy that uses high-activity, removable /sup 125/I sources in the RIF-1 murine flank tumor is reported. Experimental end points are clonogenic cell and tumor regrowth delay assays. For the clonogenic cell assay, interestitial radiation is delivered at total doses of 500-10,000 rad at dose rates of 0.9-2.7 rad/min to cells in annuli of tissue in the tumor. Dose-survival curves are characterized by an initial shoulder followed by a straight (exponential) portion, with D/sub 0/ similar to that of the curve obtained by external irradiation of the RIF-1 tumor in a self-contained cesium irradiator at similar dose rates. Tumor regrowth curves have been obtained for minimum tumor doses of 500-5000 rad; marked tumor regression has been observed with minimum tumor doses as low as 2000 rad, but results are not as reproducible as the results obtained with the clonogenic cell assay.
Research Organization:
Univ. of California, San Francisco
OSTI ID:
6707973
Journal Information:
Radiat. Res.; (United States), Journal Name: Radiat. Res.; (United States) Vol. 91:3; ISSN RAREA
Country of Publication:
United States
Language:
English

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