NIH Ends Mpox Study Early

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The National Institutes of Health (NIH) says its STOMP (study of tecovirimat for Mpox) trial found that the antiviral drug tecovirimat did not reduce the time to lesion resolution or have an impact on pain among adults with mild to moderate clade II mpox and a low risk of developing severe disease. There were no safety concerns associated with tecovirimat, according to an interim data analysis from the international clinical trial.

NIH says that given the definitive results, the trial’s data safety and monitoring board recommended stopping further enrollment of study participants and NIH accepted that recommendation.

“The initial STOMP findings provide valuable insight to inform clade II mpox medical countermeasures and underscore the critical importance of conducting well-designed randomized clinical trials during infectious disease outbreaks,” said National Institute of Allergy and Infectious Diseases director Jeanne Marrazzo. “Before 2022, no treatment candidate had been studied in people with mpox, and this trial is a critical step in our systematic evaluation of existing antivirals like tecovirimat while pursuing novel antivirals and antibody-based mpox therapeutics.”

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