SIRT1 and myeloid sarcoma: We also used flow cytometry to assess SIRT1 protein expression in PBMC samples of untreated MS patients (n = 5; average age: 41.20±5.76; female:male = 5∶0) and age-and-sex matched HS (n = 6; average age: 38.67±4.80; female:male = 6∶0).