PGF and endometrial cancer: Next, the Tukey-Kramer multiple comparison test indicated that no significant differences were observed between serum PlGF levels in endometrial cancer patients with stage I (11.05±1.09 pg/ml), stage II (10.52±2.06 pg/ml) or stage III (11.91±2.34 pg/ml) disease as compared to healthy control subjects (8.11±0.74 pg/ml) (Fig. 1).