Oxybutynin Reduces Hot Flashes in Men Receiving Androgen Deprivation Therapy for prostate cancer: Study
Researchers have found in a new study that among men with prostate cancer undergoing androgen deprivation therapy, use of oxybutynin 5 mg twice daily significantly reduced the frequency and severity of hot flashes compared with placebo. Patients also reported notable improvements in quality of life in this randomized trial.
Hot flashes are a common side effect reported by men receiving androgen-deprivation therapy (ADT) for the treatment of prostate cancer. We sought to determine whether oxybutynin could improve hot flash symptoms in men with prostate cancer. Patients with prostate cancer receiving a stable regimen of ADT with at least 28 hot flashes per week were randomly assigned to receive either oxybutynin 2.5 mg twice daily, oxybutynin 5 mg twice daily, or matching placebo for 6 weeks.
The primary end point was the change in patient-reported hot flash scores since baseline at 6 weeks. Additional outcomes included incidence of adverse events (AEs), changes since baseline in Hot Flash–Related Daily Interference Scale (HFRDIS) scores, and patient-reported symptoms.
Results: Eighty-eight patients were enrolled, with the 81 participants eligible for final analysis reporting an average of 10.1 (standard deviation [SD], 5.55) hot flashes per day and an average daily hot flash score of 18.2 (SD, 13.5) included in final analysis. On average, patients on the placebo arm, 2.5 mg oxybutynin arm, and 5 mg oxybutynin arm had reductions in hot flashes/day of 2.15, 4.77 (P = .02), and 6.89 (P < .001), respectively.
Daily hot flash scores for placebo, 2.5 mg oxybutynin, and 5 mg oxybutynin reduced by an average of 4.85, 9.94 (P = .07), and 13.95 (P = .002) points, respectively. No treatment-related grade 3+ AEs occurred. HFRDIS total scores improved by 14.2 and 20.7 points in the 2.5 mg (P = .042) and 5 mg (P < .01) oxybutynin arms, respectively, compared with a 3.1-point improvement with placebo. Oxybutynin is superior to a placebo for the management of ADT-associated hot flashes in men with prostate cancer.
Reference:
Bradley J. Stish et al. Alliance A222001: Oxybutynin Versus Placebo for the Treatment of Hot Flashes in Patients Receiving Androgen-Deprivation Therapy for Prostate Cancer. J Clin Oncol 0, JCO-25-01486. DOI:10.1200/JCO-25-01486
