FABP4 and diabetes mellitus: Furthermore, the circulating levels of FABP4 in the DM-PAD group were found to be approximately two-fold higher than the DM-noPAD group (23.34 ± 15.27 ng/mL vs. 10.30 ± 7.59 ng/mL, respectively; p-value = 0.001), even after removing patients with ulceration, (23.12 ± 15.77 ng/mL for DM-PAD vs. 10.30 ± 7.59 ng/mL for DM-noPAD; p-value = 0.001).