Abnormal uterine bleeding (AUB) continues to be a top-10 reason why women present for gynecologic care, which makes keeping up with clinical therapies important. Over the past year, we have learned a tremendous amount about elagolix with hormonal add-back therapy for the treatment of bleeding associated with uterine fibroids. In this Update, we provide an overview from 3 randomized clinical trials on the recent US Food and Drug Administration (FDA)-approved drug, elagolix with hormonal add-back therapy (approved May 29, 2020). In addition, we review the data on the Cerene cryotherapy device (Channel Medsystems), as one might rightly ask, do we need another endometrial ablation device? We will address that question, as this device has some unique features that gynecologists should be aware of. Last, we review a study on the importance of considering quality of life in patients with uterine fibroids, which provides sobering information on the psychosocial aspects of uterine fibroids that all clinicians who care for such patients should be aware of.
Endometrial ablation with a new cryotherapy device: Is less more?
Curlin HL, Cintron LC, Anderson TL. A prospective, multicenter, clinical trial evaluating the safety and effectiveness of the Cerene device to treat heavy menstrual bleeding. J Minim Invasive Gynecol. 2021;28:899-908.
The phrase “less is more,” in the world of architecture and design, is often associated with Ludwig Mies van der Rohe (1886–1969). One could argue that this principle is one key advantage with the addition of yet another non-resectoscopic endometrial ablation device. The Cerene cryotherapy device, FDA approved in 2019, is presented as a simple, disposable device for in-office use that takes advantage of natural cryoanesthesia and results in less tissue destruction than many other ablation methods.
Device reduces bleeding and permits greater ability for future evaluation
Recently, Curlin and colleagues conducted a prospective, multicenter clinical trial to evaluate the safety and efficacy of the Cerene device in reducing menstrual blood loss.1 They followed 230 patients over 12 months and found that 81% (77% with intention-to-treat analysis) met the primary end point of a pictorial blood loss assessment chart (PBLAC) score of 75 or lower. Clinically, this translated to 44% of patients experiencing light bleeding; 27%, eumenorrhea; and 10%, amenorrhea. This is clearly “less” in terms of the rate of amenorrhea in most endometrial ablation studies. However, this also may translate into “more” ability to evaluate the endometrial cavity in the future, as 97% of the patients were able to undergo hysteroscopy at the 12-month mark and, of those, 93% were able to have the entire endometrial cavity assessed.
Further, of 97 patients who had a tubal sterilization, none had symptoms or evidence of postablation tubal sterilization syndrome. Three patients were unable to undergo hysteroscopy due to pain intolerance (2) or cervical stenosis (1). This is important because some gynecologists have expressed concern over intrauterine synechiae, which may result in scarring and associated future difficulty in assessing the endometrium for possible cancer.
Details about the device
The Cerene device is a single use, disposable device that uses cryothermal energy from nitrous oxide that results in a liquid-to-gas phase change within a polyurethane balloon (resulting in a temperature of -86°C) and delivered through a 6-mm sheath. It may be used in uterine cavities that measure between 2.5 and 6.5 cm in length, corresponding to approximately 10 cm in a uterine sound measurement. Treatment time is 2.5 minutes of nitrous oxide flow.
As mentioned, another benefit claimed is that the Cerene device’s cryoanalgesia properties enable the procedure to be more tolerated in the office setting. Of the 230 patients studied in the Curlin trial, no procedures were performed under general anesthesia.1 Medications used included paracervical block (PCB) only (8%), PCB plus nonsteroidal anti-inflammatory drugs (19.8%), PCB plus oral narcotics/anxiolytics (69%), and PCB plus intravenous sedation (2.9%), showing that this device is ideally suited for in-office use.
The rate of serious adverse events was 2.5% (7 total events in 6 patients within 12 months). All serious adverse events were reviewed by a Clinical Events Committee and none were deemed to be device-related events.
Long-term outcomes remain to be seen
For physicians and patients who worry about the ability to access the endometrial cavity in the future, less may be more. It will be interesting to see what the long-term outcomes show with use of the Cerene cryotherapy device, and whether a lower amenorrhea rate will translate into a higher repeat intervention rate or not. Of course, not all are minimalists. As the architect Robert Venturi (1925–2018) was quoted as saying, “Less is a bore.”
WHAT THIS EVIDENCE MEANS FOR PRACTICE
The new Cerene cryotherapy endometrial ablation method meets the FDA’s target for reduction of menstrual blood loss, but it has a slightly lower amenorrhea rate than other devices. Its most significant features are the potential for improved analgesia for in-office use and the possibility that there may be less scarring of the endometrial cavity for future assessment if needed.
The new Cerene cryotherapy endometrial ablation method meets the FDA’s target for reduction of menstrual blood loss, but it has a slightly lower amenorrhea rate than other devices. Its most significant features are the potential for improved analgesia for in-office use and the possibility that there may be less scarring of the endometrial cavity for future assessment if needed.
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