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6-18. and liver (10.6, IQR 8.6-13.4). In lymphoid tissues, uptake was highest in spleen (10.9, IQR 8.8-12.4) and bone marrow (2.5, IQR 2.1-3.. SUV in tumor lesions (n = 41) at baseline was 1.9 (IQR 1.7-2.3). In 11 patients, serial imaging was performed, three at week 6, seven at week 2, and one at week 4. Median [ F]FB-IL2 tumor uptake decreased from 1.8 (IQR 1.7-2.1) at baseline to 1.7 (IQR 1.4-2.1) during treatment (p = 0.043). Changes in [ F]FB-IL2 tumor uptake did not correlate with response. IL-2R expression in four archival tum