One coding SNP, designated as rs1126757, Ala82Ala, in IL11 and one promoter SNP, designated as rs1061758, ?06A/G, in IL11RA were genotyped using direct sequencing in 94 patents with PTC and 213 patients without PTC (controls). Genetic data were analyzed using commercially available software. The patients with PTC were dichotomized and compared with respect to clinicopathologic characteristics of PTC.
We found an association between PTC and the coding SNP(rs1061758) in IL11RA (codominant model 1 [G/G vs A/G], odds ratio [OR] = 2.91, 95 % confidence interval [CI], 1.44-5.89; P = .003; codominant model 2 [G/G vs A/A], OR = 2.95, 95 % CI, 1.30-6.72; P = .01; and dominant model, OR = 2.92, 95 % CI, 1.47-5.80; P = .002). Moreover, SNP rs1061758 in IL11RA was associated with the multifocality of PTC (codominant model 2 [A/A vs G/G], OR = 9.56, 95 % CI, 1.77-51.69; P = .009; and recessive model, OR = 7.22, 95 % CI, 1.72-30.3; P = .007). Genotype and allele analyses of SNP variant rs1126757 in IL11 revealed no statistically significant differences between patients with PTC and controls.
Our results suggest that an IL11RA promoter polymorphism ?rs1061758 ?may be associated with the risk of PTC in the Korean population. In addition, rs1061758 might be related to the multifocality of PTC.