Efficacy and safety of fezolinetant, a neurokinin-3 antagonist, in treating vasomotor symptoms in postmenopausal women: A systematic review and meta-analysis.

BACKGROUND: Menopause causes a variety of symptoms such as hot flashes and night sweats. While menopausal hormonal therapy has been used for managing postmenopausal vasomotor symptoms (VMS) for quite a while, it has a considerably poor safety profile. OBJECTIVE: To review and analyze existing data to evaluate the efficacy of the neurokinin-3 antagonist, fezolinetant, in treating postmenopausal VMS and to assess its safety profile. METHODS: A thorough literature search was performed on PubMed, Cochrane Library, and Google Scholar in compliance with Preferred Reporting Items for Systematic Reviews and Meta-Analysis 2020, to find publications on the efficacy of fezolinetant for postmenopausal VMS. Changes in the frequency and severity scores of moderate/severe VMS and changes in the Hot Flash-Related Daily Interference Scale (HFRDIS), Greene Climacteric Scale (GCS), and Menopause-Specific Quality of Life (MENQoL) were the efficacy outcomes. Adverse events, drug-related treatment-emergent adverse effects (TEAEs), drug-related dropouts, hepatotoxicity, endometrial hyperplasia or tumor, and uterine bleeding were all safety outcomes. We used Review Manager 5.4 for pooling risk ratios (RRs) and mean differences (MDs) for dichotomous and continuous outcomes, respectively. A P value of < .05 was considered significant. RESULTS: There was a significant reduction in mean daily VMS frequency at weeks 4 and 12 (MD, -2.36; 95% confidence interval [CI], -2.85 to -1.87; P < .00001, for week 12) and also a significant decrease in VMS severity scores in the treatment group. Furthermore, improvements in MENQoL, HFRDIS, and GCS scores were observed. There was no significant difference in adverse events while drug-related TEAEs (RR, 1.21; 95% CI, 0.90-1.63; P = .21) showed a slight increase with fezolinetant. Drug-related dropouts were again similar across the 2 groups. Uterine bleeding had a lower incidence while endometrial events and hepatotoxicity showed a statistically insignificant, increasing trend in the fezolinetant group. DISCUSSION AND IMPLICATIONS: Fezolinetant can be a treatment option for postmenopausal VMS but warns of a risk increase in endometrial hyperplasia or tumors. The heterogeneity in the data being analyzed, short follow-up period, and small sample size in most of the included randomized controlled trials were the greatest limitations, which must be considered in further research and safety profile exploration.