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Mean whole-tumor radioactivity concentrations in each of the 3 experimental groups (IV bolus, continuous IV, and convection-enhanced delivery [CED]) at each of the 3 experimental time points. Values are means ± SEM. Note that the y-axis scale is logarithmic. At each time point, the mean tumor values in the CED groups are > 100-fold greater than those in the 2 corresponding intravenous groups.
