FCGR3B and Behcet disease: Black et al. (2012) found that CNV of the FCGR3B gene was associated with the risk of BD in the Iranian population. The risk of BD was decreased by 40% in people with less than two copies of FCGR3B and by 25% in people with more than two copies of FCGR3B, although these tendencies were not statistically significant. They concluded that no association exists between high or low copy number of FCGR3B and BD or its clinical features (Black et al., 2012).