APOB and myeloid sarcoma: The serum levels of AOPPs were strongly positively correlated with the serum levels of cholesterol (IDL-C), free cholesterol (IDL-FC), triglycerides (IDL-TG), phospholipids (IDL-PL), and apoB (IDL-apoB) in IDL (Figure 3A–E) in both the HVs and patients with MS.