BD patients often present with comorbid inflammatory conditions (Perugi et al., 2015; Rosenblat & McIntyre, 2015) and/or elevated expression of proinflammatory cytokines, such as interleukin‐4 (IL‐4), interleukin‐6 (IL‐6), interleukin‐1β (IL‐1β) and tumor necrosis factor‐α (TNFα) (Barbosa et al., 2014; Brietzke et al., 2009; Brietzke et al., 2009). This evidence concerns the gene IL4 and Behcet disease.