Estetrol: a new word in modern hormonal contraception. A review

The concept of the demographic policy of the Russian Federation is to increase the birth rate, preserve citizens' health, and increase life expectancy. One of the priority areas is the reproductive health of women. The pleiotropic effect of the components of combined hormonal drugs is successfully used in clinical practice by obstetricians-gynecologists not only for contraception but also for conditions requiring prophylaxis and drug therapy. Estrogens have a protective effect on the reproductive and extragenital organs; however, evidence of the effect of estrogen-containing drugs on breast tissue and hemostasis remains debatable. We analyzed the data published in the international databases PubMed, Google Scholar, and MEDLINE (search depth – 5 years). Estetrol (E4) is a native fetal estrogen produced by the fetal liver during pregnancy. The key difference from other estrogens is its highly selective and differentiated effect on various tissues and its unique antiproliferative properties. The review presents the results of studies on estrogenic and antiestrogenic effects of E4 and the combination of E4 with progestogen (Esteretta drug product approved in Russia), with particular attention paid to the oncoprotective effect of E4. Research data suggest that E4 may have different effects on breast epithelial cells and breast cancer cells compared to other estrogens. Clinical data indicate that E4 has a more selective pharmacological profile compared to other estrogens, which is reflected in a low estrogenic effect on the liver, including the production of sex hormone binding globulin, hemostasis parameters, and lipid profile.