APOA1 and myeloid sarcoma: In agreement with a pronounced phospholipase activity of EL and a high affinity of EL for HDL phospholipids [9,15,16,17,46,47], we observed a negative correlation between EL and HDL phospholipid content (HDL-PL/HDL-apoA-I) in HV, but not in MS patients (Figure 4B).