NAMPT and neoplasm: We found no differences in visfatin concentrations depending on NET primary site (panNETs vs. siNETs, median [IQR]: 4.98 [2.13–264.96] vs. 7.46 [2.01–199.44] ng/mL, p = 0.95), tumor grade (G1 vs. G2, median [IQR]: 17.23 [2.44–265.55] vs. 4.45 [1.62–158.45] ng/mL, p = 0.31), and sex (male vs. female, median [IQR]: 20.27 [1.23–277.34] vs. 4.84 [2.42–104.56] ng/mL, p = 0.89).