Related Experiment Video
Updated: Jul 13, 2026

06:18
An In Vivo Estrogen Deficiency Mouse Model for Screening Exogenous Estrogen Treatments of Cardiovascular Dysfunction After Menopause
Published on: August 13, 2019
[The effect of postmenopausal hormone replacement therapy on endometrial bleeding]
Zoltán Magyar1, Zsolt Csapó, Zoltán Papp
1Semmelweis Egyetem, Altalános Orvostudományi Kar, I. Szülészeti és Nogyógyászati Klinika, Budapest. magyar@noil.sote.hu
Orvosi Hetilap
|July 28, 2007
Summary
Postmenopausal hormone replacement therapy (HRT) did not increase endometrial cancer risk. Combined HRT preparations reduced hyperplasia frequency, lowering adenocarcinoma risk.
Area of Science:
- Gynecology
- Endocrinology
- Oncology
Context:
- Menopausal hormone replacement therapy (HRT) is widely used for symptom management.
- Endometrial changes and bleeding patterns are critical concerns with HRT.
- Understanding HRT's impact on endometrial health is crucial for patient safety.
Purpose:
- To evaluate the effect of different postmenopausal HRT regimens on endometrial bleeding.
- To assess histological changes in the endometrium associated with HRT.
- To determine the relationship between HRT, endometrial hyperplasia, and adenocarcinoma risk.
Summary:
- This study analyzed 5893 women undergoing menopausal HRT.
- Hormone replacement therapy (HRT) was associated with less frequent bleeding compared to controls.
- While estrogen-only HRT increased hyperplasia risk, combined estrogen-progestogen therapy led to endometrial atrophy and reduced hyperplasia, with no complex hyperplasia with atypia observed.
Impact:
- HRT does not elevate endometrial carcinoma risk.
- Combined HRT preparations effectively decrease endometrial hyperplasia and the potential for adenocarcinoma.
- Findings support the use of balanced HRT for endometrial health management in postmenopausal women.
Related Concept Videos
Menopause
Menopause, a natural biological process marking the end of a woman's fertility, typically occurs between the fifth and sixth decade of life. This phase is characterized by the exhaustion of the ovarian follicle pool, leading to less responsive ovaries despite the high levels of Follicle Stimulating Hormone (FSH) and Luteinizing Hormone (LH). The consequential decrease in estrogen production results in symptoms like hot flashes, heavy sweating, headaches, hair loss, muscle pains, vaginal...
Hormonal Regulation of the Menstrual Cycle
The ovarian cycle regulates endometrial changes throughout a single menstrual cycle via the coordinated action of gonadotrophin-releasing hormone (GnRH) and gonadotrophins.
At puberty, GnRH begins a pulsatile release pattern, which triggers the anterior pituitary gland to secrete follicle-stimulating hormone (FSH) and luteinizing hormone (LH). The frequency and amplitude of GnRH pulses vary across the menstrual cycle, with faster pulses favoring LH release and slower pulses favoring FSH release.
At puberty, GnRH begins a pulsatile release pattern, which triggers the anterior pituitary gland to secrete follicle-stimulating hormone (FSH) and luteinizing hormone (LH). The frequency and amplitude of GnRH pulses vary across the menstrual cycle, with faster pulses favoring LH release and slower pulses favoring FSH release.
The Menstrual Cycle
The menstrual cycle is a recurrent sequence of changes in the uterine endometrium, specifically its functional layer, the stratum functionalis. This cycle prepares the uterus for potential pregnancy. This cycle typically spans 21–35 days, averaging 28 days, and aligns with the ovarian cycle, regulated by fluctuating levels of ovarian hormones, primarily estrogen and progesterone.
The menstrual phase occurs from days 1 to 5 and involves the shedding of the stratum functionalis, as a uterine...
The menstrual phase occurs from days 1 to 5 and involves the shedding of the stratum functionalis, as a uterine...
Disorders of the Female Reproductive System
The female reproductive system can be affected by several disorders, including Premenstrual Syndrome (PMS), Premenstrual Dysphoric Disorder (PMDD), endometriosis, and various forms of cancer. PMS and PMDD are cyclical conditions that cause physical and emotional distress, with symptoms that include edema, mood swings, and food cravings. PMDD is a more severe form of PMS characterized by increased symptom severity that peaks during the luteal phase and tends to improve or resolve shortly after...
Menses Phase
The uterine cycle begins with the menstrual phase, which is considered day one of the cycle and typically lasts about five days. This phase is characterized by the degeneration and shedding of the stratum functionalis, the functional layer of the endometrium.
When fertilization does not occur, the corpus luteum deteriorates, causing a significant drop in the levels of estrogen and progesterone in the body. This hormonal decrease triggers the release of prostaglandins, which cause the uterine...
When fertilization does not occur, the corpus luteum deteriorates, causing a significant drop in the levels of estrogen and progesterone in the body. This hormonal decrease triggers the release of prostaglandins, which cause the uterine...