MIB1 and diffuse large B-cell lymphoma: The immunostaining results of the two patient groups with and without 18 F-FLT PET (22 and 40 (20 FL and 20 DLBCL), respectively) were very similar (Table 2); again in the group without 18 F-FLT PET, the median percentage of MIB-1 positive cells was 10% (range, 5% to 30%) in FL and 80% (60%to 90%) in DLBCL.