OUP accepted manuscript

Preoperative medical therapy before surgery for uterine fibroids

BACKGROUND

Uterine fibroids occur in up to 40% of women over 35 years of age. Up to 50% of uterine fibroids cause symptoms that warrant treatment: anaemia caused by heavy menstrual bleeding, pelvic pain, dysmenorrhoea, infertility and poor quality of life. Surgery is the first choice of treatment, but medical therapies have been used prior to surgery to improve outcomes. Gonadotropin-hormone-releasing analogues (GnRHa) induce a low-oestrogen state that shrinks fibroids, but they have unacceptable side effects if used long-term. Other potential hormonal treatments include progestins and selective progesterone-receptor modulators (SPRMs). This updates a Cochrane review published in 2017.

OBJECTIVES

To assess the benefits and risks of medical treatments prior to surgery for uterine fibroids.

SEARCH METHODS

We searched the Cochrane Gynaecology and Fertility Group Specialized Register, CENTRAL, MEDLINE, Embase, PsycINFO and CINAHL on 8 August 2024. We also searched trials registers (ClinicalTrials.gov; WHO ICTRP), theses and dissertations, and grey literature, as well as handsearching reference lists of retrieved articles and contacting pharmaceutical companies.

SELECTION CRITERIA

We included randomised controlled trials of premenopausal women receiving medical therapy before myomectomy, hysterectomy or hysteroscopic resection for uterine fibroids versus placebo, no pretreatment or another medical therapy.

DATA COLLECTION AND ANALYSIS

We used standard Cochrane methods. We assessed the certainty of the evidence using GRADE.

MAIN RESULTS

We included 41 RCTs, which involved 3982 women. Thirty-six studies evaluated GnRHa: the comparators were no pretreatment (19 studies), placebo (9 studies), or other medical pretreatments (progestin, SPRMs, selective oestrogen receptor modulators (SERMs), dopamine agonists, oestrogen receptor antagonists) (8 studies). Five studies evaluated SPRMs versus placebo. Most results provided low-certainty evidence due to poor reporting of randomisation procedures, lack of blinding, imprecision and inconsistency. Some outcomes were not measured or did not have usable data. The use of ulipristal acetate (an SPRM) is suspended at this time (March 2025) because of an association with cases of liver failure. GnRHa versus placebo or no pretreatment before surgery for uterine fibroids GnRHa pretreatment may reduce uterine volume (mean difference (MD) -175.34 mL, 95% confidence interval (CI) -219.04 to -131.65; 13 studies, 858 participants; I² = 67%; low-certainty evidence) and fibroid volume (MD range 5.7 mL to 155.4 mL; 5 studies to heterogeneous to pool, 427 participants; low-certainty evidence), and probably increases preoperative haemoglobin (MD 0.88 g/dL, 95% CI 0.68 to 1.08; 10 studies, 834 participants; I² = 0%; moderate-certainty evidence). However, there is probably a greater likelihood of adverse events with GnRHa (odds ratio (OR) 2.78, 95% CI 1.77 to 4.36; 5 studies, 755 participants; I² = 28%; moderate-certainty evidence). No usable data were available for preoperative bleeding. Hysterectomy Duration of hysterectomy may be reduced amongst women who receive GnRHa treatment (-10.11 minutes, 95% CI -16.96 to -3.25; 6 studies, 617 participants; I² = 57%; low-certainty evidence). Results are uncertain for intraoperative blood loss (4 heterogeneous studies, 258 participants; MD range 25 mL to 148 mL, in favour of GnRHa; very low-certainty evidence). There are probably fewer blood transfusions with GnRHa (OR 0.54, 95% CI 0.29 to 1.01; 6 studies, 601 participants; I² = 0%; moderate-certainty evidence) and less postoperative morbidity (OR 0.54, 95% CI 0.32 to 0.91; 7 studies, 772 participants; I² = 28%; moderate-certainty evidence). Myomectomy There is uncertainty about the effects of GnRHa pretreatment on surgery duration (7 heterogeneous studies, 443 participants) (very low-certainty evidence) and intraoperative blood loss during myomectomy (11 studies too heterogenous to pool, 549 participants; very low-certainty evidence). GnRHa may make little to no difference to blood transfusions (OR 0.85, 95% CI 0.26 to 2.75; 4 studies, 121 participants; I² = 0%; low-certainty evidence) or postoperative morbidity (OR 1.07, 95% CI 0.43 to 2.64; I² = 0%; 5 studies, 190 participants; low-certainty evidence). Hysteroscopic resection GnRHa treatment before hysteroscopic resection of uterine myomas may result in little to no difference in surgery duration (2 studies,123 participants; low-certainty evidence). One study reported no cases of postoperative morbidity in either group (84 participants; low-certainty evidence). GnRHa versus other medical therapies before surgery - preoperative outcomes GnRHa may be associated with a greater reduction in uterine volume than other medical therapies (-47% compared to -20% and -22% with 5 mg and 10 mg ulipristal acetate, respectively; low-certainty evidence). There may be little to no difference in bleeding reduction (ulipristal acetate 5 mg: OR 0.71, 95% CI 0.30 to 1.68; 1 study, 199 participants; low-certainty evidence), and there is probably little to no difference in preoperative haemoglobin (MD -0.02, 95% CI -0.41 to 0.37; 242 participants; moderate-certainty evidence). We are uncertain whether there is any difference in fibroid volume between GnRHa and cabergoline (MD 12.71 mL, 95% CI -5.92 to 31.34; 2 studies, 110 participants; I² = 0%; low-certainty evidence). Adverse events such as hot flushes may be more likely with GnRHa (OR 2.83, 95% CI 1.68 to 4.77; 6 studies, 507 participants; I² = 59%; low-certainty evidence). SPRMs versus placebo before surgery - preoperative outcomes SPRMs (mifepristone, CDB-2914, ulipristal acetate and asoprisnil) before surgery probably reduce uterine volume (2 heterogenous studies, 275 participants; moderate-certainty evidence) and may reduce fibroid volume (5 heterogeneous studies, 451 participants; low-certainty evidence). SPRMs probably increase preoperative haemoglobin (MD 0.93 g/dL, 95% CI 0.52 to 1.34; 2 studies, 173 participants; I² = 0%; moderate-certainty evidence), and they may reduce bleeding before surgery (ulipristal acetate 5 mg: OR 41.41, 95% CI 15.26 to 112.38; 1 study, 143 participants; asoprisnil: MD -166.9 mL; 95% CI -277.60 to -56.20; 1 study, 22 participants; low-certainty evidence). Results were very imprecise for adverse events (low-certainty evidence).

AUTHORS' CONCLUSIONS

Pretreatment with gonadotropin-hormone-releasing analogues may reduce uterine and fibroid volume and probably increases preoperative haemoglobin levels, but probably also increases the number of adverse events. Blood transfusions and operation time during hysterectomy may be reduced, with fewer women experiencing postoperative morbidity. SPRMs, such as ulipristal acetate, seem to offer similar advantages: they probably reduce uterine volume and increase haemoglobin level before surgery, and may reduce fibroid volume and fibroid-related bleeding. However, replication of these studies is advised as the certainty of the evidence is moderate to low.

Hepatic Safety Considerations in the Use of Ulipristal Acetate for Symptomatic Uterine Fibroids

Introduction

Ulipristal acetate (UPA, 5 mg) demonstrated efficacy in symptom reduction for patients with symptomatic fibroids. While registration and post-marketing trials assessing UPA identified few hepatic concerns, post-marketing concerns about potential drug-induced liver injury (DILI) led to significant restrictions, including indication restriction, warning labels and mandatory liver function monitoring. These measures, along with two marketing suspensions, resulted in a decline in UPA use, ultimately leading to the withdrawal of its marketing authorization previously in Canada, Australia, as well as Singapore and in 2024, at the request of the marketing authorization holder for commercial reasons, also for the European Union.

Methods

This narrative review critically evaluates the hepatic safety considerations associated with UPA.

Results

On reassessment, the risk of severe DILI with UPA is low at 13.5:100.000, with an incidence of 1 in 200,000 for liver transplantation. These numbers are lower than with many other widely prescribed medications, where no regular liver monitoring is recommended. UPA was subjected to strict liver test monitoring although proof of effectiveness of these measures in preventing serious DILI was lacking. While the risk of severe hepatotoxic events is important to consider, a balanced approach to safety measures is needed, particularly in light of the higher risks associated with alternative treatment options such as surgical intervention.

Conclusion

While UPA had a unique place in the treatment of uterine fibroids, overly cautious regulatory measures due to exceedingly rare DILI incidences led to the withdrawal of its marketing authorization in most parts of the world. There is a need for an improved understanding of DILI mechanisms and causality assessments to aid in the development of more proportional regulatory responses, balancing patient safety and sustained access to effective innovative treatment.

Progesterone signaling in uterine leiomyoma biology: Implications for potential targeted therapy

Uterine leiomyomas (ULs) are the most common benign smooth muscle cell steroid-dependent tumors that occur in women of reproductive age. Progesterone (P4) is a major hormone that promotes the ULs development and growth. P4 action in ULs is mediated mainly by its nuclear progesterone receptors (PGRs), although rapid non-genomic responses have also been observed. Data on the membrane progesterone receptors (mPRs) regulated signaling pathways in ULs in the available literature is still very limited. One of the essential characteristics of ULs is the excessive production of extracellular matrix (ECM). P4 has been shown to stimulate ECM production and collagen synthesis in ULs. Recent research demonstrated that, despite their benign nature, ULs may present with abnormal vasculature. P4 has been shown to regulate angiogenesis in ULs through the upregulation of vascular endothelial growth factor (VEGF) and by controlling the secretion of permeability factors. This review summarizes the key findings regarding the role of PGRs and mPRs in ULs, especially highlighting the potential ECM and angiogenesis modulation by P4. An increased understanding of this mechanistic role of nuclear and specifically mPRs in the biology of P4-modulated ECM and angiogenesis in the growth of ULs could turn out to be fundamental for developing effective targeted therapies for ULs.

Considerations on implementation of the newest treatment for symptomatic uterine fibroids: Oral GnRH antagonists

Novel gonadotrophin releasing hormone (GnRH) antagonist treatments have recently been developed in combination with hormonal add-back therapy, as an oral treatment option for women suffering from uterine fibroids. Registration trials assessing the GnRH antagonist combination preparations with relugolix, elagolix and linzagolix have assessed treatment efficacy for fibroid-related heavy menstrual blood loss in comparison to placebo. Marketing authorization has been granted by several agencies including those in Europe, the United Kingdom and the United States. While the registration trials report a robust effect on the reduction of heavy menstrual blood loss and improvement in quality of life scores, reticence is advised before widespread prescription. In this review, we demonstrate limitations in the trial data, namely a lack of generalizability due to the restricted study population, the lack of transparency in the distribution of disease-level characteristics limiting the predictability of treatment success in the real-world diverse population, and the absence of any comparison to current alternative treatment methods. Importantly, no clinically meaningful volume reductions were found with GnRH antagonist combination preparations, and long-term safety data, particularly concerning modest but stable bone mineral density decline, need further addressing. Symptoms related to uterine fibroids adversely affect many women's quality of life and effective medical treatments are lacking. However, despite the urgent need for conservative treatments, it is vitally important that novel drugs, like combination oral GnRH antagonists, undergo sufficiently rigorous evaluation of safety, effectiveness and cost-effectiveness in a representative population and are compared with alternative treatment methods before introduction into mainstream clinical practice.

A review of phase II and III drugs for the treatment and management of endometriosis

INTRODUCTION

Endometriosis is an estrogen-dependent disease that gives rise to pelvic pain and infertility. Although estroprogestins and progestins currently stand as the first-line treatments for this condition, demonstrating efficacy in two-thirds of patients, a significant portion of individuals experience only partial relief or symptom recurrence following the cessation of these therapies. The coexistence of superficial, deep endometriosis, and ovarian endometriomas, as three distinct phenotypes with unique pathogenetic and molecular characteristics, may elucidate the current heterogeneous biological response to available therapy.

AREAS COVERED

The objective of this review is to furnish the reader with a comprehensive summary pertaining to phase II-III hormonal treatments for endometriosis.

EXPERT OPINION

Ongoing research endeavors are directed toward the development of novel hormonal options for this benign yet debilitating disease. Among them, oral GnRH antagonists emerge as a noteworthy option, furnishing rapid therapeutic onset without an initial flare-up; these drugs facilitate partial or complete estrogen suppression, and promote prompt ovarian function recovery upon discontinuation, effectively surmounting the limitations associated with previously employed GnRH agonists. Limited evidence supports the use of selective estrogen and progesterone receptor modulators. Consequently, further extensive clinical research is imperative to garner a more profound understanding of innovative targets for novel hormonal options.

Novel Approaches to Possible Targeted Therapies and Prophylaxis of Uterine Fibroids

Uterine leiomyomas are the most common benign tumors in women of childbearing age. They may lead to problems of conception or complications during the gestational period. The methods of treatment include surgical (myomectomy and hysterectomy, embolization of arteries) and therapeutic treatment (ulipristal acetate, leuprolide acetate, cetrorelix, goserelin, mifepristone). Both approaches are efficient but incompatible with pregnancy planning. Therefore, there is a call for medical practice to develop therapeutical means of preventing leiomyoma onset in patients planning on becoming pregnant. Based on the analysis of GWAS data on the search for mononucleotide polymorphisms associated with the risk of leiomyoma, in meta-transcriptomic and meta-methylomic studies, target proteins have been proposed. Prospective therapeutic treatments of leiomyoma may be based on chemical compounds, humanized recombinant antibodies, vaccines based on markers of the uterine leiomyoma cells that are absent in the adult organism, or DNA and RNA preparations. Three different nosological forms of the disease associated with driver mutations in the MED12, HMGA2, and FH genes should be considered when developing or prescribing drugs. For example, synthetic inhibitors and vaccines based on matrix metalloproteinases MMP11 and MMP16 are expected to be effective only for the prevention of the occurrence of MED12-dependent nodules.

Oral gonadotrophin-releasing hormone (GnRH) antagonists: the continuing search for the ideal nonsurgical therapy of uterine fibroids with a cautionary tale

PURPOSE OF REVIEW

Uterine fibroids are very common with a prevalence of over 70%. They present a significant economic and psychological burden. A variety of nonsurgical treatments exist for its management encompassing hormonal and nonhormonal methods. Gonadotrophin-releasing hormone (GnRH) antagonists are a novel treatment for uterine fibroids. They cause a rapid reduction in endogenous GnRH, leading to a dose-dependent reduction in levels of oestradiol and progesterone, thus reduction in bleeding. The addition of hormones, estrogen, and progesterone, known as add-back therapy, helps curb the menopausal side effects. As such, they pose a potential long-term nonsurgical therapy for management of symptomatic fibroids.

RECENT FINDINGS

There are various uses of GnRH antagonists and the results from the clinical trials are promising. Caution needs to be taken when new treatment options are introduced with audit and data collection tools in place to assess effectiveness as well as any side effects.

SUMMARY

This article highlights the uses of GnRH antagonists in practice and reflects on previous novel treatments for fibroids with a focus on Ulipristal acetate. It states the importance of using audit tools and multiinstitutional databases to prevent and allow early discovery of issues such as those that encumbered Ulipristal.

Progesterone receptor ligands for the treatment of endometriosis

Estrogen dependence and progesterone resistance play a crucial role in the origin and development of endometriosis. Therefore, hormonal therapies are currently the most effective treatment. Progestins are considered the first-line approach, especially for a long-term management. Progestins are synthetic compounds that mimic the effects of progesterone by binding progesterone receptors. Continuous use of progestins leads to the suppression of ovarian steroidogenesis with anovulation and low serum levels of ovarian steroids, causing endometrial pseudodecidualization. Moreover, they act by interfering on several endometriosis pathogenetic pathways, decreasing inflammation, provoking apoptosis in endometriotic cells, stimulating atrophy or regression of endometrial lesions, inhibiting angiogenesis, and decreasing expression of metalloproteinases, thus diminishing the invasiveness of endometriotic implants. Progestins are effective for pain relief and improvement of the quality of life (QoL). The side effects are limited, and the compounds are available in different formulations and routes of administration and represent, in most cases, an inexpensive treatment option. Dienogest, Medroxyprogesterone acetate and Norethisterone acetate are the labeled progestins for endometriosis, but other progestins, such as Dyhidrogesterone, Levonorgestrel and Desogestrel, have been shown to be effective in the treatment of endometriosis-associated pain. The present review aims to describe the available and emerging evidences on progestins used for the treatment of endometriosis.

Progesterone Signaling and Uterine Fibroid Pathogenesis; Molecular Mechanisms and Potential Therapeutics

Uterine fibroids (UFs) are the most important benign neoplastic threat to women's health worldwide, with a prevalence of up to 80% in premenopausal women, and can cause heavy menstrual bleeding, pain, and infertility. Progesterone signaling plays a crucial role in the development and growth of UFs. Progesterone promotes the proliferation of UF cells by activating several signaling pathways genetically and epigenetically. In this review article, we reviewed the literature covering progesterone signaling in UF pathogenesis and further discussed the therapeutic potential of compounds that modulate progesterone signaling against UFs, including selective progesterone receptor modulator (SPRM) drugs and natural compounds. Further studies are needed to confirm the safety of SPRMs as well as their exact molecular mechanisms. The consumption of natural compounds as a potential anti-UFs treatment seems promising, since these compounds can be used on a long-term basis-especially for women pursuing concurrent pregnancy, unlike SPRMs. However, further clinical trials are needed to confirm their effectiveness.

Uterine fibroids: modern methods of treatment, advantages and complications

The state of the reproductive system by women with uterine fibroids is considered as a part of this literature review. The main clinical manifestations of myomatous nodes were identified by writing the review: abnormal uterine and heavy menstrual bleeding, infertility, miscarriage, chronic pelvic pain, dysfunction of adjacent organs, which are indications for surgical treatment. It is noted that approximately 30 % of women with uterine fibroids suffer from abnormal uterine bleeding, leading to anemia and reduced quality of life. Chronic pelvic pain significantly reduces the quality of life of patients, worsening their functional and mental state and disrupting sexual function. This review focuses on reproductive problems in women with leiomyoma. Taking into consideration the high prevalence of this nosology and the need to preserve the fertility of patients, the review describes modern methods of treating patients with uterine myoma, including drug therapy surgical treatment and alternative methods. Currently, in order to stop the symptoms of uterine fibroids, as well as for preoperative preparation, conservative therapy is used, which allows to reduce pain, restore hemoglobin levels, reduce intraoperative blood loss and reduce surgery time. Reproductive disorders associated with uterine fibroids, such as infertility, recurrent miscarriage, and adverse obstetric outcomes, are a significant reason to improve organ-preserving therapies or develop new ones. Although hysterectomy is a radical treatment for uterine fibroids, it is unacceptable for patients who have not realized their reproductive function. Therefore, the most justified intervention is myomectomy with various surgical approaches, and as an alternative treatment, uterine artery embolization, radiofrequency ablation or high-intensity focused ultrasound treatment of uterine fibroids. These data allow us to conclude that the high prevalence and versatility of symptoms of uterine fibroids among patients of reproductive age determine the relevance of searching for optimal methods of treatment.