PRKN and myeloid sarcoma: Serum concentrations of Parkin were higher in Gd+ MS (median, interquartile range (IQR) 32.03, 23.10–41.94 pg/ml) than in Gd− MS patients (median, IQR 12.29, 9.90–18.61 pg/ml) (Mann-Whitney; p < 0.0001) (Fig. 2c).