Results: CD33 rs3865444 was associated with MS risk in the dominant (GG vs. GT + TT; OR (95% C.I.)= 0.79 (0.63–0.99), p = 0.041) and the over-dominant (GG + TT vs. GT; OR (95% C.I.)= 0.77 (0.61–0.97), p = 0.03) modes of inheritance. Here, CD33 is linked to myeloid sarcoma.