FOXO1 and preeclampsia: The mean maternal serum FoxO1 levels were significantly lower both in early-onset (9.1 ± 3.8 vs. 29.1 ± 3.2, p < 0.001) and late-onset preeclampsia (2.6 ± 1.6 vs. 29.1 ± 3.2, p < 0.001) than the normotensive pregnancies.