ABCB6 and Osteochondroma: The median RANK expression level was 227 (range, 20.9–799) for GCTB, 242 (range, 23.6–1409) for osteochondroma, 104 (range; 55.2–258) for ABC, and 89.1 (range; 26.8–337) for FD (Fig 2).