Change in longest diameter = -19%
Change in sum of perpendicular diameters = -21%
Change in CT Volume = -37%
Change in PET SUVmax = -18%
Comparison of Response Measures Change in longest diameter = -19% Change in sum of perpendicular diameters = -21% Change in CT Volume = -37% Change in PET SUVmax = -18%
Standardized Uptake Value Under certain circumstances, 18 FDG SUV correlates with metabolic rate of glucose and/or the number of viable tumor cells Simplified semi-quantitative measure that can be routinely performed in clinical PET studies Adjusts for differences in patient size and injected activity SUV (time) = Radioactive Concentration x Weight Injected Activity
EORTC PET metabolic response criteria Complete response (CR): Complete resolution of all lesions Partial Response (PR): Greater than or equal to 25% decrease in SUVmax. Stable Disease (SD): Less than 25% change Progressive Disease (PD): Greater than or equal to 25% increase in SUVmax