How do we measure success in the treatment of genitourinary syndrome of menopause?

Laser for genitourinary syndrome of menopause: what we know and what we need to know

Energy-based treatments, including the fractional CO2 laser, have been widely used for treatment of genitourinary symptoms associated with menopause. With the availability of data from seven double-blind sham-controlled randomized trials, the evidence does not support the fractional CO2 laser as an efficacious treatment for genitourinary syndrome of menopause (GSM). A 2024 meta-analysis of these trials demonstrated that the symptom with greatest absolute improvement was dyspareunia at 16.3%, although not statistically significant. This improvement is far less than previously anticipated based on prospective data that suggested promising improvements of more than 90% satisfaction following laser treatment. Other data, including those from unblinded studies which are subject to a placebo effect, and outcomes that are not participant-reported including the appearance of the vagina on examination and histology, are not reliable in determining efficacy of laser treatment for GSM. While there may be a clinical effect of laser over sham treatments for GSM, the effect is unlikely to be clinically meaningful. Until we define and demonstrate a minimal clinically important difference in a robust and appropriately powered study, the laser should not be used in a clinical context for GSM.

Laser versus sham for genitourinary syndrome of menopause: A randomised controlled trial

OBJECTIVE

To assess whether CO2 laser treatment is more effective than sham application in relieving the most bothersome symptom (MBS) in women with genitourinary syndrome of menopause (GSM).

DESIGN

Single-centre, sham-controlled, double-blind, randomised trial.

SETTING

A tertiary centre in Belgium.

POPULATION

Sixty women with moderate to severe GSM symptoms.

METHODS

All participants eventually received three consecutive laser and three consecutive sham applications, either first laser followed by sham, or conversely.

MAIN OUTCOME MEASURES

The primary outcome was the participant-reported change in severity of the MBS at 12 weeks. Secondary outcomes included subjective (patient satisfaction, sexual function, urinary function) and objective (pH, Vaginal Health Index Score, in vivo microscopy) measurements assessing the short-term effect and the longevity of treatment effects at 18 months after start of the therapy. Adverse events were reported at every visit.

RESULTS

The MBS severity score decreased from 2.86 ± 0.35 to 2.17 ± 0.93 (-23.60%; 95% CI -36.10% to -11.10%) in women treated with laser compared with 2.90 ± 0.31 to 2.52 ± 0.78 (-13.20%; 95% CI -22.70% to -3.73%) in those receiving sham applications (p = 0.13). There were no serious adverse events reported up to 18 months.

CONCLUSIONS

In women with GSM, the treatment response 12 weeks after laser application was comparable to that of sham applications. There were no obvious differences for secondary outcomes and no serious adverse events were reported.

Genitourinary Syndrome of Menopause Assessment Tools

New therapeutic options are being considered to treat genitourinary syndrome of menopause (GSM), such as vaginal laser, ospemifene, or prasterone, but there is no explicit agreement in the scientific community for its use. Some concerns have arisen on how to evaluate the improvement of GSM symptoms. In 2003, the FDA suggested possible end points for this purpose: change in severity of symptoms, change in vaginal pH, and change in vaginal maturation index (VMI). Contrarily, the most common assessment tools used to quantify severity and improvement of GSM nowadays are the visual analog scale of GSM symptoms, the vaginal health index, and the female sexual function index. In our opinion, subjective and objective variables to evaluate GSM can be differentiated, and not many of the considered objective outcomes are used in the recent literature assessing GSM. There is the possibility that some therapies present only subjective improvement, giving place to a possible placebo effect that is not being evaluated. To conclude, there is a demand to evaluate whether vaginal pH and VMI are enough to assess objectively GSM changes or new objective approaches should be audited.

Vaginal laser therapy for genitourinary syndrome of menopause - systematic review

BACKGROUND

Genitourinary syndrome of menopause (GSM) can have a great impact on the quality of life (QOL), and affects between 53.8% and 90% of postmenopausal women. The literature suggests that vaginal laser therapy could be an effective treatment for GSM symptoms, but its efficacy and safety have not been established and international societies do not endorse its use. Despite that, there has been an increase in the use of vaginal laser therapy globally over the last decade.

OBJECTIVE

The objective of this review is to evaluate the literature which assesses the efficacy and safety of the vaginal laser therapy in the treatment of GSM.

METHODS

A comprehensive literature search was conducted electronically using Embase and PubMed to retrieve studies assessing evidence for the efficacy and safety of vaginal laser therapy for GSM or vulvovaginal atrophy up to June 2021.

RESULTS

A total of 64 studies were finally included in the review. There were 10 controlled intervention studies, 7 observational cohort and cross-sectional studies and 47 before-after studies without a control group.

CONCLUSION

Vaginal laser seems to improve scores on the Visual Analogue Scale (VAS), Female Sexual Function Index (FSFI) and Vaginal Health Index (VHI) in GSM over the short term. Safety outcomes are underreported and short-term. Further well-designed clinical trials with sham-laser control groups and evaluating objective variables are needed to provide the best evidence on efficacy.

Vaginal Er:YAG laser application in the menopausal ewe model: a randomised estrogen and sham-controlled trial

OBJECTIVE

To describe effects of non-ablative erbium-doped:yttrium-aluminium-garnet (Er:YAG) laser on vaginal atrophy induced by iatrogenic menopause in the ewe.

DESIGN

Animal experimental, randomised, sham and estrogen-treatment controlled study with blinding for primary outcome.

SETTING

KU Leuven, Belgium.

SAMPLE

Twenty-four ewes.

METHODS

Menopause was surgically induced, after which the ewes were randomised to three groups receiving vaginal Er:YAG laser application three times, with a 1-month interval; three sham manipulations with a 1-month interval; or estrogen replacement and sham manipulations. At given intervals, ewes were clinically examined and vaginal wall biopsies were taken. Vaginal compliance was determined by passive biomechanical testing from explants taken at autopsy.

MAIN OUTCOME MEASURES

Vaginal epithelial thickness (primary), composition of the lamina propria (collagen, elastin, glycogen and vessel content), vaginal compliance, clinical signs.

RESULTS

Animals exposed to Er:YAG laser application and sham manipulation, but not to estrogens, displayed a significant and comparable increase in vaginal epithelial thickness between baseline and 7 days after the third application (69% and 67%, respectively, both P < 0.0008). In laser-treated ewes, temporary vaginal discharge and limited thermal injury were observed. Estrogen-substituted ewes displayed a more prominent increase in epithelial thickness (202%; P < 0.0001) and higher vaginal compliance (P < 0.05). None of the interventions induced changes in the lamina propria.

CONCLUSIONS

Vaginal Er:YAG laser has comparable effect to sham manipulation in menopausal ewes.

TWEETABLE ABSTRACT

Vaginal Er:YAG laser has comparable effect to sham manipulation in menopausal ewes #LASER #GSM #RCT.