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Original Article
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Volume 350:672-683 February 12, 2004 Number 7
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Circulating Angiogenic Factors and the Risk of Preeclampsia
Richard J. Levine, M.D., M.P.H., Sharon E. Maynard, M.D., Cong Qian, M.S., Kee-Hak Lim, M.D., Lucinda J. England, M.D., M.S.P.H., Kai F. Yu, Ph.D., Enrique F. Schisterman, Ph.D., Ravi Thadhani, M.D., M.P.H., Benjamin P. Sachs, M.B., B.S., D.P.H., Franklin H. Epstein, M.D., Baha M. Sibai, M.D., Vikas P. Sukhatme, M.D., Ph.D., and S. Ananth Karumanchi, M.D.

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ABSTRACT

Background The cause of preeclampsia remains unclear. Limited data suggest that excess circulating soluble fms-like tyrosine kinase 1 (sFlt-1), which binds placental growth factor (PlGF) and vascular endothelial growth factor (VEGF), may have a pathogenic role.

Methods We performed a nested case–control study within the Calcium for Preeclampsia Prevention trial, which involved healthy nulliparous women. Each woman with preeclampsia was matched to one normotensive control. A total of 120 pairs of women were randomly chosen. Serum concentrations of angiogenic factors (total sFlt-1, free PlGF, and free VEGF) were measured throughout pregnancy; there were a total of 655 serum specimens. The data were analyzed cross-sectionally within intervals of gestational age and according to the time before the onset of preeclampsia.

Results During the last two months of pregnancy in the normotensive controls, the level of sFlt-1 increased and the level of PlGF decreased. These changes occurred earlier and were more pronounced in the women in whom preeclampsia later developed. The sFlt-1 level increased beginning approximately five weeks before the onset of preeclampsia. At the onset of clinical disease, the mean serum level in the women with preeclampsia was 4382 pg per milliliter, as compared with 1643 pg per milliliter in controls with fetuses of similar gestational age (P<0.001). The PlGF levels were significantly lower in the women who later had preeclampsia than in the controls beginning at 13 to 16 weeks of gestation (mean, 90 pg per milliliter vs. 142 pg per milliliter, P=0.01), with the greatest difference occurring during the weeks before the onset of preeclampsia, coincident with the increase in the sFlt-1 level. Alterations in the levels of sFlt-1 and free PlGF were greater in women with an earlier onset of preeclampsia and in women in whom preeclampsia was associated with a small-for-gestational-age infant.

Conclusions Increased levels of sFlt-1 and reduced levels of PlGF predict the subsequent development of preeclampsia.


Source Information

From the Division of Epidemiology, Statistics, and Prevention Research, National Institute of Child Health and Human Development, Department of Health and Human Services, Bethesda, Md. (R.J.L., L.J.E., K.F.Y., E.F.S.); the Departments of Medicine (S.E.M., F.H.E., V.P.S., S.A.K.) and Obstetrics and Gynecology (K.-H.L., B.P.S., S.A.K.), Beth Israel Deaconess Medical Center and Harvard Medical School, Boston; Allied Technology Group, Rockville, Md. (C.Q.); the Harvard School of Public Health, Boston (B.P.S.); the Departments of Medicine and Obstetrics, Massachusetts General Hospital and Harvard Medical School, Boston (R.T.); and the Department of Obstetrics and Gynecology, University of Cincinnati College of Medicine, Cincinnati (B.M.S.).

Drs. Levine and Karumanchi contributed equally to the article.

Address reprint requests to Dr. Levine at the National Institute of Child Health and Human Development, Bldg. 6100, Rm. 7B03, Bethesda, MD 20892, or at levinerj{at}mail.nih.gov, or to Dr. Karumanchi at Beth Israel Deaconess Medical Center, 330 Brookline Ave., Dana 517, Boston, MA 02215, or at sananth{at}bidmc.harvard.edu.

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Related Letters:

Circulating Angiogenic Factors and Preeclampsia
Tsatsaris V., Goffin F., Foidart J. M., Levine R. J., Karumanchi S. A.
Extract | Full Text | PDF  
N Engl J Med 2004; 350:2003-2004, May 6, 2004. Correspondence

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