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Radiology, Vol 116, 165-169, Copyright © 1975 by Radiological Society of North America

ARTICLES

Tumor microvasculature following fractionated x irradiation

DE Hilmas and EL Gillette

The microvasculature of C3H/Bi mouse mammary carcinomas 8 mm in average diameter was evaluated using morphometric methods following six consecutive daily exposures of 500 R of x radiation. Tumor volume did not change significantly during the intervals between treatments. Tumors began to grow again 72 hours after the sixth 550-R fraction, with mean vessel length and surface area reaching maximum values and vessel diameters and volumes becoming minimal at this time. These changes were attributed to improved colloidal-carbon filling of previously existing nonfunctional vessles. When anatomically derived estimates of vascular dimensions were related to a metabolically useful blood supply, improved capability for exchange of essential nutrients occurred 72 hours after the sixth 500-R fraction.


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J. He, T. A. Luster, and P. E. Thorpe
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