CD34 and cervical squamous intraepithelial neoplasia: All study subjects were divided into 3 groups according to circulating EPC levels (high-EPC level [first EPC tertile], CD34+KDR+ ≧9 cells/105 events; intermediate-EPC level [second EPC tertile], CD34+KDR+ = 5–8 cells/105 events; low-EPC level [third EPC tertile], CD34+KDR+ ≦ 4 cells/105 events), and the incidence of CIN by tertiles of EPC levels is illustrated in Figure 3A.