CCL2 and Behcet disease: Some studies have found no significant difference in MCP-1 between BD patients during euthymia and controls (Brietzke et al., 2009; Barbosa et al., 2012b; Jakobsson et al., 2015), while others found that MCP-1 is significantly increased (Drexhage et al., 2011; Bai et al., 2014).