FURIN and diabetes mellitus: Compared to participants with a normal FPG, the median levels of serum furin was significantly lower in those with prediabetes (median: 0.96 ng/mL vs. 1.05 ng/mL, P=0.003) and diabetes (median: 0.90 ng/mL vs. 1.05 ng/mL, P=0.001) (Figure 1).