In MS, the concentration of BA was reduced and that of CA was increased. The higher plasma concentrations of lipopolysaccharide and intestinal fatty acid-binding protein. CA was positively associated with CD4+/IFNγ+ T lymphocytes, and the BA/CA ratio correlated positively with CD4+/CD25high/Foxp3+ and negatively with CD4+/IFNγ+ T lymphocytes. Here, FABP2 is linked to myeloid sarcoma.