TNF and Behcet disease: According to a recent review [35], c-reactive protein (CRP) [43,44], interleukin (IL)-6 and IL-18 [45], soluble IL-2 receptor (sIL-2R), secretory tumor necrosis factor-alpha (sTNF-α) [46], and TNF-α [45,46] would not differ between males and females with BD.