DPP4 and apolipoprotein A-I deficiency: Figure 2A shows that DPP4 serum concentration was higher in the non-hypoalphalipoproteinemia subjects when compared with hypoalphalipoproteinemia participants (125.2 [98.4–153.7] ng/mL vs. 117.8 [94.6–148.9] ng/mL, P = 0.008, respectively).