The comparison of the secretion of PDGF-AB between the anti-platelet and control groups of type 2 DM patients. PRP from patients of type 2 DM in the anti-platelet group (n=9) and PRP from patients of the control group (n=25) were stimulated by 1.5 mg/ml of (A) ristocetin, 1 µM of (B) ADP or vehicle for 4 min, and the levels of PDGF-AB in the conditioned mixture were determined using ELISA. The value of the levels of PDGF-AB are presented as mean ± standard deviation. **P<0.01 or***P<0.001, compared to the value of control. PRP, platelet-rich plasma; DM, diabetes mellitus.