In the 22 patients who underwent 18 F-FLT imaging, 18 F-FLT uptake was lower in FL than in DLBCL (median SUVmax 5.7 (range 3.0 to 6.7) versus 8.9 (range 3.7 to 18; p = 0.004)), consistent with the lower proliferation rate of FL compared with DLBCL (median percentage of MIB-1 positive cells 10% in the 7 FL patients and 70% in the 15 DLBCL patients (Table 1)). This evidence concerns the gene MIB1 and diffuse large B-cell lymphoma.