Laser Therapies Don’t Benefit GSM

CHICAGO — Use of CO2 lasers and similar “energy-based” treatments result in little to no benefit for genitourinary syndrome of menopause (GSM) symptoms, according to research presented at the North American Menopause Society (NAMS) 2024 Annual Meeting in Chicago on September 12.

“There was a concern that menopausal women are being targeted for treatments that may not have a lot of benefit and might have significant harms,” Elisheva Danan, MD, MPH, a physician at the Minneapolis VA Health Care System and an assistant professor of medicine at the University of Minnesota Medical School in Minneapolis, told Medscape Medical News. While she was not surprised to find little evidence of benefit, “we were a little bit surprised that we also didn’t find significant evidence of harms.”

The study was unable to evaluate the potential for financial harms, but Danan noted that these therapies are often expensive and not typically covered by insurance. The treatments appear to be used primarily in private practice, she said, while “most academic clinicians were not familiar with these and do not use these lasers.”

The American Urological Association had requested the review, Danan said, “to inform clinical guidelines that they could put out for practitioners about treating genital urinary syndrome from menopause.” Yet the evidence available remains slim. “There’s a lot of outcomes that were not looked at by most of these [trials], or they were looked at in a way that we couldn’t separate out,” she said.

Kamalini Das, MD, a professor of OBGYN at the University of Minnesota who was not involved in the research, was surprised by the findings because studies to date have been variable, “but since this looks at multiple studies and they find no benefits, I would take these results as more significant than any of the small studies,” she told Medscape Medical News.

Das said she has patients who ask about using these therapies and have had them done. “So far, I’ve told them the jury is out on whether it will help or not, that there are some studies that say they’re beneficial and some studies that they’re not,” Das said.

But this new review changes what she will tell patients going forward, she said. “This is a good study because it consolidates lots of little studies, so I think I would use this to say, looking at all the studies together, this treatment is not beneficial.”

GSM occurs due to the body’s reduced production of estrogen and affects anywhere from 27% to 84% of postmenopausal women. It can involve a constellation of symptoms ranging from vaginal discomfort and irritation to painful urination or intercourse. Typical recommended treatments for GSM include systemic hormone therapy, localized hormonal treatments such as vaginal estrogen or dehydroepiandrosterone, nonhormonal creams and moisturizers, and the prescription drug ospemifene.

Most of these have been found effective, according to a recent systematic review Danan published in the Annals of Internal Medicine that Medscape Medical News covered. But recent years have also seen a rapid increase in interest and the availability of energy-based treatments for GSM, such as CO2 laser and radiofrequency interventions, particularly for those who cannot or do not want to use hormonal treatments. The idea behind these newer therapies is that they “heat tissue to cause a denaturation of collagen fibers and induce a wound-healing response,” with the aim of “enhancement of vaginal elasticity, restoration of premenopausal epithelial function, and symptom improvement,” the authors wrote.

Evidence has been scant and uneven for the safety and effectiveness of these treatments, and they have not been evaluated by the US Food and Drug Administration. The agency issued a warning in 2018 with remarks from then Commissioner Scott Gottlieb that the “products have serious risks and don’t have adequate evidence to support their use for these purposes.”

Much of the evidence has focused on CO2 lasers instead of other energy-based treatments, however, and a raft of new studies have been published on these interventions in the past 2 years. Danan and colleagues, therefore, assessed the most current state of the research with a systematic review of randomized controlled trials (RCTs) and prospective observational studies with control groups published through December 11, 2023.

Included studies needed to evaluate an energy-based treatment for at least 8 weeks in a minimum of 40 postmenopausal women (20 in each group) who had one or more GSM symptoms. The authors also included nonrandomized and uncontrolled studies with a follow-up of a year or more to assess possible adverse events. The studies also needed to assess at least one of eight core outcomes: Dyspareunia; vulvovaginal dryness; vulvovaginal discomfort/irritation; dysuria; change in most bothersome symptom; treatment satisfaction; adverse events; and distress, bother, or interference associated with genitourinary symptoms.

The authors identified 32 studies, including 16 RCTs, one quasi-RCT, and 15 nonrandomized studies. The researchers extracted and analyzed data from the 10 RCTs and one quasi-RCT that were rated as having low to moderate risk for bias.

Most of these studies assessed CO2 lasers alone, while three assessed erbium:yttrium-aluminum-garnet (Er:YAG) laser, and one looked at CO2 lasers vs radiofrequency treatments.

The average age of participants ranged from 56 to 64 years, and most trials were in the United States. Results showed that CO2 lasers led to little or no difference in dysuria, dyspareunia, or quality of life when compared with sham lasers. The CO2 laser therapy also showed little to no difference compared with vaginal estrogen creams for dyspareunia, dryness, discomfort/irritation, dysuria, or quality of life.

Most CO2 laser studies reported on most outcomes, but the Er:YAG studies tended to report only on quality of life and/or one or two other outcomes. The radiofrequency study only assessed dyspareunia and quality of life.

“Treatment effects on other outcomes and effects of Er:YAG laser or radiofrequency on any outcomes are very uncertain,” the authors reported. Few adverse events and no serious adverse events were reported based on 15 studies, including the additional non-RCTs that had follow-up for at least a year.

“There are case reports and other types of studies that have shown some bad outcomes using laser therapies, and we really wanted to be expansive and include anything, especially because this is such a new treatment and all these trials were in the last couple of years,” Danan said. 

The review was limited by inconsistent or nonvalidated outcome reporting in the studies as well as small populations and short follow-up, typically less than 3 months.

The research was funded by the Agency for Healthcare Research and Quality and Patient-Centered Outcomes Research Institute. Danan and Das had no disclosures.

Tara Haelle is a health/science journalist based in Dallas. Follow her on X: @tarahaelle.