Under the overdominant genetic model, there was a significant association between the form of MS and the IL-27-A964G polymorphism (p = 0.0301), the frequency of the variant AG genotype tending to be higher in MS patients with the RR form compared to patients with the SP form (Chi-square test, adjusted p-value = 0.0516, 57.8% vs. 27.3%). Here, IL27 is linked to myeloid sarcoma.