In an investigation of skewing toward Th1 (IFN-γ, TNF-α, and IL-2), Th2 (IL-4 and IL-10), or Th17 (IL-17) cytokine profiles, only IL-2 showed significantly higher levels in PsA than in BD (P = 0.017) (Table 2). The gene discussed is IL4; the disease is Behcet disease.