Patients suffering from CVD (mean: 395.96 ± 154.77 ng/mL) (p = 0.002) and PC (mean: 385.18 ± 99.60 ng/mL) (p = 0.003) had significantly higher chemerin serum levels compared to MS, whereas mean values of patients with either ID or epilepsy did not significantly differ in chemerin serum levels from the control group or MS patients. The gene discussed is RARRES2; the disease is myeloid sarcoma.