RecruitingPhase 3NCT07220772

A Study Evaluating Mibavademab Treatment of Obesity Due to Leptin (LEP) Gene Mutations in Children, Adolescents and Adults

An Open-Label Study of Mibavademab (REGN4461), a Leptin Receptor Agonist, for the Treatment of Monogenic Obesity Due to Biallelic Loss of Function Variants of the LEP Gene

Sponsor

Regeneron Pharmaceuticals

Enrollment

4 participants

Start Date

Feb 9, 2026

Study Type

INTERVENTIONAL

Conditions

Monogenic Obesity

Summary

This study is researching an experimental drug called mibavademab. The study is focused on patients with a condition called monogenic obesity. Monogenic obesity is caused by a change in the leptin gene that keeps it from working properly. This causes the body to not be able to feel full or control feelings of hunger. The aim of the study is to see how well mibavademab controls the body weight and how safe it is. The study is looking at several other research questions, including: * How much mibavademab is in the blood at different times * Whether the body makes proteins called antibodies against mibavademab (which could stop mibavademab from working as well or could lead to side effects) * What side effects may happen from taking mibavademab

Eligibility

Min Age: 2 Years

Inclusion Criteria2

Has documented medical history of biallelic loss of function variants of the LEP gene prior to the screening visit
Has class ≥2 obesity at screening and at baseline, as defined in the protocol

Exclusion Criteria8

Unwilling or unable to provide, or have the treating physician provide, documented historical weight for at least 6 months prior to screening
History of bariatric surgery within approximately the past 12 months of study screening
History of weight loss of ≥5% of body weight in approximately the past 3 months of study screening
History of genetic causes of obesity other than/in addition to biallelic loss of function variants of the LEP gene
History of schizophrenia, bipolar disorder, or other mental illness that, in the opinion of the investigator, might pose a safety risk to participation in a clinical study of an investigational drug
Any suicidal ideation of type 4 or 5 on the Columbia Suicide Severity Rating Scale (C-SSRS) during screening or baseline, or any lifetime history of a suicide attempt, or any lifetime history of suicidal behavior, including ideation
Treatment with medications for weight loss or medications with known side effects of weight loss within the past approximately 3 months of study screening
Participants currently being treated with metreleptin, or a history of prior treatment with metreleptin as defined in the protocol

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