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Rhythm Pharmaceuticals Announces Positive Results in Phase 2 Trial for Prader-Willi Syndrome Treatment

Rhythm Pharmaceuticals, Inc. (RYTM) | 2025-12-11

By Hannah Lewis

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Rhythm Pharmaceuticals reported positive preliminary results from the exploratory Phase 2 trial of setmelanotide in patients with Prader-Willi syndrome (PWS).

The trial showed reductions in BMI and hyperphagia in patients with PWS after 3 and 6 months of treatment with setmelanotide.

Of the 18 enrolled patients, 17 remain on therapy, supporting the advancement of setmelanotide into a Phase 3 trial.

Therapeutic Benefit Demonstrated

Setmelanotide therapy showed potential therapeutic benefits with reductions in BMI and hyperphagia in patients with PWS at Month 3 and Month 6.

Promising Results

Preliminary results indicated that the majority of patients achieved reductions in BMI and improvements in HQ-CT scores with consistent safety and tolerability.

Future Trials Planned

Rhythm Pharmaceuticals plans to initiate a Phase 3 registrational trial for setmelanotide in PWS and has started a Phase 1 trial for MC4R agonist RM-718 in PWS patients.

  • The positive results from the Phase 2 trial suggest a potential treatment option for addressing the challenges faced by PWS patients, including hyperphagia and severe obesity.
  • Setmelanotide's efficacy in reducing BMI and hyperphagia, along with the high retention rate of patients on therapy, provide optimism for the upcoming Phase 3 trial and future treatment options.

Rhythm Pharmaceuticals' successful Phase 2 trial results pave the way for further development of setmelanotide as a potential therapy for Prader-Willi syndrome, addressing the critical needs of patients with this rare neuroendocrine disorder.