However, when testing the associations between the ratios indicating the lipid content of HDL particles and vessel function, we found a significant negative correlation of HDL1-C/HDL1-apoA-I and HDL1-PL/HDL1-apoA-I with FMD in HV, but again not in MS patients (Figure 3A,B and Table S3). This evidence concerns the gene APOA1 and myeloid sarcoma.