Core Insights - MBX Biosciences has initiated a Phase 1 clinical trial for MBX 4291, a novel glucagon-like peptide-1 (GLP-1)/glucose-dependent insulinotropic polypeptide (GIP) co-agonist prodrug aimed at treating obesity, marking a significant milestone in addressing global obesity issues [2][6] - The trial is designed to evaluate the safety, tolerability, pharmacokinetics, and pharmacodynamics of MBX 4291, with topline results expected in 2027 [2][9] - MBX 4291 is positioned as a best-in-class weight loss prodrug, with potential for once-monthly administration and improved gastrointestinal tolerability compared to existing treatments [2][6] Clinical Trial Details - The Phase 1 trial consists of two parts: Part A involves single ascending doses administered to 5 cohorts of 8 participants each, followed by a 63-day observation period [2][3] - Part B includes multiple ascending doses over 4 weeks, with 3 cohorts of 8 participants each, followed by a 71-day observation period [3][4] - After Parts A and B, the company plans to evaluate multiple ascending doses over 12 weeks in up to two cohorts of 30 participants each, with a total of 12 administrations [4] Product Information - MBX 4291 is developed using the proprietary Precision Endocrine Peptide™ (PEP™) platform, designed to enhance treatment adherence and achieve greater long-term weight loss [6][7] - Preclinical studies indicate that MBX 4291 has a similar activity profile to tirzepatide, an approved weekly GLP-1/GIP co-agonist, but with an extended duration of action supporting once-monthly administration [7] - The company is also advancing other candidates in its pipeline, including canvuparatide for chronic hypoparathyroidism and imapextide for post-bariatric hypoglycemia, indicating a broad focus on endocrine and metabolic disorders [8]
MBX Biosciences Doses First Participant in Phase 1 Trial of MBX 4291 for the Treatment of Obesity