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Completed

NCT Number: NCT05669599

Dose-ranging Study to Evaluate the Efficacy, Safety, and Tolerability of AMG 133 in Adult Subjects With Overweight or Obesity, With or Without Type 2 Diabetes Mellitus

The study aims to compare and assess the dose response of 3 selected doses of maridebart cafraglutide compared with placebo, on inducing and maintaining weight loss from baseline at Week 52 in participants with overweight or obesity without diabetes mellitus (Cohort A) and in participants with overweight or obesity with Type 2 diabetes mellitus (Cohort B).

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Key information

Age range

18 year–99 year

Sex eligibility

All sexes

Study type

Interventional

Phase

Phase 2

Primary location

Royal Prince Alfred Hospital (RPAH) Clinic, Camperdown, New South Wales, Australia

Loading trial locations.

Who can participate

Healthy volunteers accepted: No

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • Age ≥18 years at the time of signing informed consent.
  • BMI ≥30 kg/m^2, or ≥27 kg/m^2 and previous diagnosis with at least one of the following comorbidities: hypertension, dyslipidemia, obstructive sleep apnea, cardiovascular disease.
  • For participants in cohort B only, HbA1c ≥ 7% and ≤ 10% (53 to 86 mmol/mol) at screening with an established diagnosis of type 2 diabetes mellitus for ≥ 180 days prior to screening and either treated with diet and exercise alone or on stable (at least 90 days prior to screening) treatment with metformin, a sulfonylurea, or a sodium-glucose cotransporter 2 (SGLT2) inhibitor as monotherapy or combination therapy, per approved local label.
  • History of at least one unsuccessful dietary effort to lose body weight.

Exclusion criteria

  • Change in body weight greater than 5 kg within 3 months prior to screening.
  • Obesity induced by other endocrinologic disorders.
  • History of pancreatitis.
  • Family or personal history of medullary thyroid carcinoma or multiple endocrine neoplasia syndrome type 2 (MEN-2).
  • History of major depressive disorder within the last 2 years.
  • Any lifetime history of other major psychiatric disorder or suicide attempt.

Treatment and study plan

Maridebart Cafraglutide

Biological

Participants will receive maridebart cafraglutide by subcutaneous (SC) injection.

Other names: AMG 133

Placebo

Drug

Participants will receive placebo by SC injection.

Primary outcomes

  1. Percent Change From Baseline to Week 52 in Body Weight

    Time frame: Baseline and Week 52

Secondary outcomes

  1. Percentage of Participants Achieving ≥ 5% Reduction in Body Weight From Baseline at Week 52

    Time frame: Baseline and Week 52

  2. Percentage of Participants Achieving ≥ 10% Reduction in Body Weight From Baseline at Week 52

    Time frame: Baseline and Week 52

  3. Achievement of ≥ 15% Reduction in Body Weight From Baseline at Week 52

    Time frame: Baseline and Week 52

  4. Achievement of ≥ 20% Reduction in Body Weight From Baseline at Week 52

    Time frame: Baseline and Week 52

  5. Change from Baseline to Week 52 in Hemoglobin A1c (HbA1c)

    Time frame: Baseline and Week 52

  6. Change from Baseline to Week 52 in Fasting Serum Insulin

    Time frame: Baseline and Week 52

  7. Change from Baseline to Week 52 in Fasting Plasma Glucose

    Time frame: Baseline and Week 52

  8. Change from Baseline to Week 52 in Homeostasis Model Assessment for Insulin Resistance (HOMA2-IR)

    Time frame: Baseline and Week 52

  9. Change from Baseline to Week 52 in Homeostasis Model Assessment for Steady State Beta Cell Function (HOMA2-%B)

    Time frame: Baseline and Week 52

  10. Maximum Observed Plasma Concentration (Cmax) of maridebart cafraglutide

    Time frame: Up to Week 64

  11. Area Under the Concentration-time Curve (AUC) of maridebart cafraglutide

    Time frame: Up to Week 64

  12. Change from Baseline to Week 52 in Waist Circumference

    Time frame: Baseline and Week 52

  13. Change from Baseline to Week 52 in Body Weight

    Time frame: Baseline and Week 52

  14. Change from Baseline to Week 52 in Systolic Blood Pressure (SBP)

    Time frame: Baseline and Week 52

  15. Change from Baseline to Week 52 in Diastolic Blood Pressure (DBP)

    Time frame: Baseline and Week 52

  16. Change from Baseline to Week 52 in Body Fat Mass Using Dual-energy X-ray Absorptiometry (DEXA)

    Time frame: Baseline and Week 52

    Analyzed in a subset of participants.

  17. Change from Baseline to Week 52 in Lean Body Mass Using DEXA

    Time frame: Baseline and Week 52

    Analyzed in a subset of participants.

  18. Percent Change From Baseline to Week 52 in High-sensitivity C-reactive Protein (hs-CRP)

    Time frame: Baseline and Week 52

  19. Change from Baseline to Week 52 in Body Mass Index (BMI)

    Time frame: Baseline and Week 52

  20. Percent Change From Baseline in Low-density Lipoprotein Cholesterol (LDL-C)

    Time frame: Baseline and Week 52

  21. Percent Change From Baseline in Total Cholesterol

    Time frame: Baseline and Week 52

  22. Percent Change From Baseline in High-density Lipoprotein Cholesterol (HDL-C)

    Time frame: Baseline and Week 52

  23. Percent Change From Baseline in non-HDL-C

    Time frame: Baseline and Week 52

  24. Percent Change From Baseline in Very-low-density Lipoprotein Cholesterol (VLDL-C)

    Time frame: Baseline and Week 52

  25. Percent Change From Baseline in Triglycerides

    Time frame: Baseline and Week 52

  26. Percent Change From Baseline in Free Fatty Acids (FFA)

    Time frame: Baseline and Week 52

Sponsors and collaborators

Lead sponsor

Amgen

Industry

Registry information

Official study title

A Phase 2 Randomized, Placebo-controlled, Double-blind, Dose-ranging Study to Evaluate the Efficacy, Safety, and Tolerability of AMG 133 in Adult Subjects With Overweight or Obesity, With or Without Type 2 Diabetes Mellitus

Important dates

Study start
2023
Primary completion
2024
Study completion
2025
First posted
Jan 3, 2023
Registry last updated
Jan 20, 2026

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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