APOA1 and myeloid sarcoma: Moreover, the serum levels of AOPPs were significantly negatively correlated with the serum levels of apoA-I in large buoyant HDL subclasses 1 (HDL1-apoA-I) and 2 (HDL2-apoA-I) in the HVs, and with the serum levels of apoA-I in the total HDL (HDL-apoA-I) as well as in small dense HDL subclass 4 (HDL4-apoA-I) in the patients with MS.