Table 4.

Relationship among the growth factor concentration (mg/L), the platelet count, and the number of freeze-thaw (FT) cycles in platelet lysate, platelet-poor plasma (PPP)

^*P<0.01 and ^†P<0.001 vs. 1×10¹²/L by paired t test; ^‡P<0.001 or ^§P=0.01 vs. PPP by independent t-test; the concentrations of VEGF (P=0.002), PDGF-AA (P=0.001), and EGF (P=0.049) showed significant differences at different numbers of FT cycles.

Abbreviations: PLT, platelet; TGF-α, transforming growth factor alpha; VEGF, vascular endothelial growth factor; PDGF, platelet-derived growth factor-AB/BB; PDGF, platelet-derived growth factor-AA; EGF, epidermal growth factor.