Highlights on Medical Treatment of Uterine Fibroids

: Uterine fibroids (leiomyomas or myomas) are the most frequent benign tumors in women. Heavy menstrual bleeding with resultant anemia, dysmenorrhea, chronic pelvic pain, infertility urinary symptoms and constipation are generally associated with uterine fibroids (UFs). Although strategies mainly resort to surgical intervention, medical treatments are considered the first-line treatment to preserve fertility and avoid surgery. The aim of this review is to offer available and newest medical treatment options for symptomatic UFs. Various medical therapies are now available for women with uterine fibroids, although each therapy has its own advantages and disadvantages. Our topic specifically explores gonadotropin-releasing hormone (GnRH) analogs and selective progesterone receptor modulators (SPRMs), but also provides the reader with useful advice on the therapies for fibroids available after the recent European Medicines Agency (EMA) warning (EMA/160220/2020). The treatment options depend on the personal treatment objectives of the patients, in addition to treatment effectiveness and necessity for recurrent interventions.

Fibroid: A common problem and its advanced management

Uterine fibroids are the most common gynaecological disorder, classically requiring surgery when symptomatic. Although attempts at finding a nonsurgical cure date back to centuries, it is only around the middle of the last century that serious attempts at a medical treatment were carried out. Initially, both progestins and estrogen–progestin combinations have been utilized, although proof of their usefulness is lacking. A major step forward was achieved when peptide analogues of the GnRH were introduced, first those with super agonist properties and subsequently those acting as antagonists. Because both types of analogues produce hypoestrogenism, their use is limited to a maximum of 6 months and, so they can’t be used routinely but utilized as an adjuvant treatment before surgery with overall good results. Over the last decade, new, nonpeptidic, orally active GnRH-receptor blockers Elagolix and another development of selective progesterone receptor modulators, sometimes referred to as “antiprogestins of choice is Ulipristal acetate are promising.Large clinical trials have proven the effectiveness of Ulipristal in the long-term medical therapy of fibroids, caution must taken for liver complications. All selective progesterone receptor modulators produce unique endometrial changes that are today considered benign, reversible, and without negative consequences. Long-term medical treatment of fibroids seems possible today, especially in premenopausal women. Surgical treatments are myomectomy, radiofrequency ablation procedure, endometrial ablation, uterine artery embolization, magnetic resonance-guided focused ultrasound myolysis are effective and reserved for the women who desires to keep uterus, and morcellation . Still Hysterectomy is the definitive treatment for fibroid and the techniques of surgery is inclining towards minimum invasive surgery.

90 YEARS OF PROGESTERONE: Selective progesterone receptor modulators in gynaecological therapies

Abnormal uterine bleeding (AUB) is a chronic, debilitating and common condition affecting one in four women of reproductive age. Current treatments (conservative, medical and surgical) may be unsuitable, poorly tolerated or may result in loss of fertility. Selective progesterone receptor modulators (SPRMs) influence progesterone-regulated pathways, a hormone critical to female reproductive health and disease; therefore, SPRMs hold great potential in fulfilling an unmet need in managing gynaecological disorders. SPRMs in current clinical use include RU486 (mifepristone), which is licensed for pregnancy interruption, and CDB-2914 (ulipristal acetate), licensed for managing AUB in women with leiomyomas and in a higher dose as an emergency contraceptive. In this article, we explore the clinical journey of SPRMs and the need for further interrogation of this class of drugs with the ultimate goal of improving women’s quality of life.

Selective Progesterone Receptor Modulators—Mechanisms and Therapeutic Utility

Selective progesterone receptor modulators (SPRMs) are a new class of compounds developed to target the progesterone receptor (PR) with a mix of agonist and antagonist properties. These compounds have been introduced for the treatment of several gynecological conditions based on the critical role of progesterone in reproduction and reproductive tissues. In patients with uterine fibroids, mifepristone and ulipristal acetate have consistently demonstrated efficacy, and vilaprisan is currently under investigation, while studies of asoprisnil and telapristone were halted for safety concerns. Mifepristone demonstrated utility for the management of endometriosis, while data are limited regarding the efficacy of asoprisnil, ulipristal acetate, telapristone, and vilaprisan for this condition. Currently, none of the SPRMs have shown therapeutic success in treating endometrial cancer. Multiple SPRMs have been assessed for efficacy in treating PR-positive recurrent breast cancer, with in vivo studies suggesting a benefit of mifepristone, and multiple in vitro models suggesting the efficacy of ulipristal acetate and telapristone. Mifepristone, ulipristal acetate, vilaprisan, and asoprisnil effectively treated heavy menstrual bleeding (HBM) in patients with uterine fibroids, but limited data exist regarding the efficacy of SPRMs for HMB outside this context. A notable class effect of SPRMs are benign, PR modulator-associated endometrial changes (PAECs) due to the actions of the compounds on the endometrium. Both mifepristone and ulipristal acetate are effective for emergency contraception, and mifepristone was approved by the US Food and Drug Administration (FDA) in 2012 for the treatment of Cushing’s syndrome due to its additional antiglucocorticoid effect. Based on current evidence, SPRMs show considerable promise for treatment of several gynecologic conditions.