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TUMOR REGRESSION DURING EXTERNAL RADIATION THERAPY
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Significant changes in tumor volumes occur during EBRT
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Tumors shrink & often quite quickly with CTRT
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Shrinkage is a double-edged sword
University of Utah used physical exam measurements and found by 30.8 Gy tumors reduced by 50%
MD Anderson used weekly conventional CT & noted a mean reduction of 64%
Lee et al. Red Journal 2005;58:625
Beadle et al. ASTRO 2006
Mayr et al. Am J Roentgenol 2006;187:65
Van de Bunt et al. Red Journal 2006;64:189