A functional polymorphism, rs28493229, in ITPKC and risk of Kawasaki disease: an integrated meta-analysis.

Kawasaki disease (KD) is a multi-systemic vasculitis which preferentially affects infants and children. A single nucleotide polymorphism (rs28493229) in the inositol 1,4,5-trisphosphate 3-kinase C (ITPKC) was identified to be associated with the increased risk of KD; however, in more recent studies associations have been controversial. Thus, we performed a meta-analysis, integrating case-control and transmission/disequilibrium test (TDT) studies, to investigate the relationship between this polymorphism and risk of KD. A total of ten case-control and two TDT studies, comprising 3,821 cases, 12,802 controls and 949 families, were included in this meta-analysis. There was a significant association between the C allele of rs28493229 and the increased risk of KD (OR = 1.53, 95 % CI = 1.34-1.74, P < 0.001), by the random-effects model because of heterogeneity (Q = 27.67, P (heterogeneity) = 0.004). Nevertheless, it was screened out by meta-regression analysis that the coronary artery lesions (CALs) status of KD could partly explain the heterogeneity, with consistently significant associations in both subgroups after stratification by CALs status. Moreover, estimates before and after the deletion of each study were similar in sensitivity analysis, indicating robust stability of the meta-analysis. This meta-analysis reveals that the functional polymorphism rs28493229 in ITPKC significantly contributes to the risk of KD.