IL1RN and systemic lupus erythematosus: The IL-1RN*2 allele (P = 0.02, OR 2.5, and 95% CI 1.2–5.4) and the 12 + 22 genotypes (P = 0.05, OR 2.6, and 95% CI 1–6.3) were found associated with SLE (Table 2).