Hence, we concluded that in MS, the T allele in GC (rs2282679) SNP and the A allele in CYP2R1 (rs10741657) were associated with higher calcidiol serum levels [71], and the T allele in CYP27B1 (rs10877012) SNP may provide genetic protection in the Caucasian Swedish population to MS [80]. The gene discussed is CYP27B1; the disease is myeloid sarcoma.