ITGAM and cystic fibrosis: The cell density of the positive stained CD11b region was (34.7 ± 4.7) % in 18F-PBR-111 positive uptake regions vs. (2.97 ± 1.18) % in the 18F-PBR-111 negative uptake region for the 3.5 week CF group, and (31.5 ± 6.9) % vs. (0.4 ± 0.1) % for the 5.0 week CF group.