IL1A and systemic lupus erythematosus: IL1-RN VNTR polymorphism showed no significant association with SLE susceptibility in a dominant model (22/2L vs. LL: OR = 1.11, 95% CI = 0.87−1.40, P = 0.40), recessive model (22 vs. LL/2L: OR = 1.32, 95% CI = 0.88−1.97, P = 0.17) or additive model (22 vs. LL: OR = 1.32, 95% CI = 0.88−1.98, P = 0.19, Table 4).