HLA-DRB1 and systemic lupus erythematosus: In this case, a significant positive association was found for DRB1*15:01 and SLE (Pc = 8.90×10−6, OR 2.47, 95% CI 1.75–3.49) and it was the protective association with DRB1*13:02 which just failed to achieve significance (Pc = 0.0646, OR 0.54, 95% CI 0.36–0.80).