Combination of the data from the two stage studies confirmed that rs1800450 in MBL2 was correlated with the risk to BD (A allele: Pc = 2.50 × 10−6, OR = 1.494; AA genotype: Pc = 2.24 × 10−6, OR = 2.899; GG genotype: Pc = 1.56 × 10−3, OR = 0.689;) (Table 2), and that rs2617170 in KLRC4 also contributed to susceptibility of BD (C allele: Pc = 2.05 × 10−9, OR = 0.664; CC genotype: Pc = 1.20 × 10−5, OR = 0.585; TT genotype: Pc = 2.53 × 10−6, OR = 1.695) (Table 2). Here, KLRC4 is linked to Behcet disease.