HLA-DRB1 and myeloid sarcoma: However, since statistical power limitations could be affecting these results, we combined AH 8.1 and non-conserved DRB1*03:01 haplotypes data (given their lack of heterogeneity: p = 0.76; I2 = 0%) and then a significant result emerged (p = 0.027, OR = 1.32, 95% CI 1.02–1.70), pointing to a contribution of DRB1*03:01 carrying haplotypes others than AH 18.2 to MS risk, as seems to be deduced from the existing literature.