The KLRC4/rs2617170 C allele and CC genotype frequencies were significantly lower in BD compared to controls (Pc = 1.47 × 10−4, OR = 0.667; Pc = 1.63 × 10−2, OR = 0.593, respectively), while a higher frequency of the TT genotype was detected in BD (Pc = 4.16 × 10−3, OR = 1.701) (Table 2). Here, KLRC4 is linked to Behcet disease.