TNFSF15 and Behcet disease: The frequencies of the TNFSF15/rs4246905 C allele and CC genotype were significantly lower in BD patients (Pc = 4.10 × 10−9, OR = 0.655; and Pc = 5.19 × 10−8, OR = 0.566, respectively), while the TT genotype frequency of TNFSF15/rs4246905 was increased (Pc = 0.008, OR = 1.639).