No significant correlations between plasma MT-1A and blood As levels emerged either in the control group or in MS group subjects divided on the basis of smoking status (r = -0.7691; p > 0.05), while a weak negative but not a significant correlation between blood As and plasma MT levels in non-smoker subjects in the control group of patients (r = 0.33378; p > 0.05). Here, MT1A is linked to myeloid sarcoma.