In MS patients carrying the T-allele, higher levels of specific proinflammatory cytokines were found, including IL-2 (median [IQR], CT/TT = 0.2 [0.0–2.0]; CC = 0.1 [0.0–0.4]; Mann–Whitney test p = 0.015), IL-6 (median [IQR], CT/TT = 1.2 [0.4–3.2] vs. CC = 0.7 [0.1–1.7]; p = 0.007), IL-15 (median [IQR], CT/TT = 0.1 [0.0–9.5] vs. CC = 0.0 [0.0–0.1]; p = 0.019), and GM-CSF (median [IQR], CT/TT = 0.1 [0.0–0.6] vs. CC = 0.05 [0.0–0.1]; p < 0.001). This evidence concerns the gene IL15 and myeloid sarcoma.