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Purpose

This study will evaluate the safety, pharmacokinetics (how the body absorbs, distributes, metabolizes, and eliminates the drug), and pharmacodynamics (how the drug affects the body) of resmetirom in children and adolescents with metabolic dysfunction-associated steatohepatitis (MASH) and liver fibrosis. Participants will receive oral resmetirom once daily for approximately 14 days at one of several dose levels. The information from this study will help determine appropriate dosing and further evaluate the safety and biological effects of resmetirom in pediatric participants with MASH.

Conditions

Eligibility

Eligible Ages
Between 6 Years and 17 Years
Eligible Sex
All
Accepts Healthy Volunteers
No

Inclusion Criteria

  1. Male or female participants 6 to 17 years of age, inclusive. 2. Parent(s) or legal guardian(s) able to provide written informed consent (as required by local regulations), with participant assent obtained as applicable. 3. Diagnose of MASH with fibrosis stage F1-F3 based on a liver biopsy obtained within 24 months before Screening. 4. Hepatic fat fraction ≥8% by magnetic resonance imaging-proton density fat fraction (MRI-PDFF) obtained during the Screening period. 5. Able to swallow study tablets. 6. Females of childbearing potential must have a negative pregnancy test at screening, must not be pregnant or breastfeeding, and must agree to use a highly effective method of contraception during the study and for at least 30 days after the last dose of study drug. Premenarchal participants and those not of childbearing potential are eligible without contraception.

Exclusion Criteria

  1. Previous exposure to resmetirom. 2. Clinically significant liver disease other than MASH or evidence of cirrhosis (F4), decompensated liver disease, or other hepatic conditions that may interfere with study participation or interpretation of results. 3. Clinically significant thyroid disease or use of thyroid replacement therapy, triiodothyronine, thyroxine, or other prohibited thyroid medications. 4. Use of prohibited concomitant medications, including medications known to affect hepatic steatosis or liver function, lipid-lowering therapies, CYP2C8 inhibitors, OATP1B1/OATP1B3/BCRP inhibitors, protease inhibitors, St. John's Wort, or other medications prohibited by the protocol. 5. Use of glucagon-like peptide-1 (GLP-1) receptor agonists unless on a stable dose for at least 24 weeks before screening. 6. Clinically significant alcohol or substance abuse, or regular use of tobacco/nicotine products within 6 months before screening. 7. Active or clinically significant infection, including chronic hepatitis B or hepatitis C infection, HIV infection, or other immunocompromising conditions. 8. History or presence of clinically significant cardiovascular, pulmonary, renal, gastrointestinal, neurologic, hematologic, endocrine, psychiatric, or other medical conditions that, in the opinion of the Investigator, could interfere with study participation or interpretation of study results. 9. History of malignancy within the past 5 years (except adequately treated non-melanoma skin cancer or other protocol-permitted exceptions). 10. History of organ transplantation or known immunocompromised status. 11. Participation in another investigational study within 60 days or 5 half-lives (whichever is longer) before screening, unless permitted by the protocol. 12. Major surgery within 6 weeks before screening. 13. Known hypersensitivity to resmetirom or any excipient. 14. Females who are pregnant or breastfeeding. 15. Any condition that, in the opinion of the Investigator, would compromise participant safety, compliance, or the integrity of the study.

Study Design

Phase
Phase 2
Study Type
Interventional
Allocation
Non-Randomized
Intervention Model
Sequential Assignment
Primary Purpose
Treatment
Masking
None (Open Label)

Arm Groups

ArmDescriptionAssigned Intervention
Experimental
Adolescent Dose-Escalation Cohort 1 		Adolescents participants 12 to 17 years of age receive the first planned dose level of oral resmetirom once daily for approximately 14 days
  • Drug: Resmetirom
    Resmetirom (MGL-3196) : Oral resmetirom administered once daily. Participants receive one of several protocol-defined dose levels assigned according to the sequential multiple ascending-dose study design. Dose escalation proceeds following review of available safety, pharmacokinetic, and pharmacodynamic data.
Experimental
Adolescent Dose-Escalation Cohort 2 		Adolescent participants 12 to 17 years of age receive the second planned dose level of oral resmetirom once daily for approximately 14 days following review of safety and PK data.
  • Drug: Resmetirom
    Resmetirom (MGL-3196) : Oral resmetirom administered once daily. Participants receive one of several protocol-defined dose levels assigned according to the sequential multiple ascending-dose study design. Dose escalation proceeds following review of available safety, pharmacokinetic, and pharmacodynamic data.
Experimental
Adolescent Dose-Escalation Cohort 3 		Adolescent participants 12 to 17 years of age receive the third planned dose level of oral resmetirom once daily for approximately 14 days following review of safety and PK data.
  • Drug: Resmetirom
    Resmetirom (MGL-3196) : Oral resmetirom administered once daily. Participants receive one of several protocol-defined dose levels assigned according to the sequential multiple ascending-dose study design. Dose escalation proceeds following review of available safety, pharmacokinetic, and pharmacodynamic data.
Experimental
Adolescent Dose-Escalation Cohort 4 		Adolescent participants 12 to 17 years of age receive the fourth planned dose level of oral resmetirom once daily for approximately 14 days following review of safety and PK data.
  • Drug: Resmetirom
    Resmetirom (MGL-3196) : Oral resmetirom administered once daily. Participants receive one of several protocol-defined dose levels assigned according to the sequential multiple ascending-dose study design. Dose escalation proceeds following review of available safety, pharmacokinetic, and pharmacodynamic data.
Experimental
Adolescent Dose-Escalation Cohort 5 		Adolescent participants 12 to 17 years of age receive the fifth planned dose level of oral resmetirom once daily for approximately 14 days following review of safety and PK data.
  • Drug: Resmetirom
    Resmetirom (MGL-3196) : Oral resmetirom administered once daily. Participants receive one of several protocol-defined dose levels assigned according to the sequential multiple ascending-dose study design. Dose escalation proceeds following review of available safety, pharmacokinetic, and pharmacodynamic data.
Experimental
Child Dose-Escalation Cohort 6 		Children participants 6 to 11 years of age receive the first planned dose level of oral resmetirom once daily for approximately 14 days.
  • Drug: Resmetirom
    Resmetirom (MGL-3196) : Oral resmetirom administered once daily. Participants receive one of several protocol-defined dose levels assigned according to the sequential multiple ascending-dose study design. Dose escalation proceeds following review of available safety, pharmacokinetic, and pharmacodynamic data.
Experimental
Child Dose-Escalation Cohort 7 		Children participants 6 to 11 years of age receive the second planned dose level of oral resmetirom once daily for approximately 14 days following review of safety and PK data.
  • Drug: Resmetirom
    Resmetirom (MGL-3196) : Oral resmetirom administered once daily. Participants receive one of several protocol-defined dose levels assigned according to the sequential multiple ascending-dose study design. Dose escalation proceeds following review of available safety, pharmacokinetic, and pharmacodynamic data.
Experimental
Child Dose-Escalation Cohort 8 		Children participants 6 to 11 years of age receive the third planned dose level of oral resmetirom once daily for approximately 14 days following review of safety and PK data.
  • Drug: Resmetirom
    Resmetirom (MGL-3196) : Oral resmetirom administered once daily. Participants receive one of several protocol-defined dose levels assigned according to the sequential multiple ascending-dose study design. Dose escalation proceeds following review of available safety, pharmacokinetic, and pharmacodynamic data.
Experimental
Child Dose-Escalation Cohort 9 		Children participants 6 to 11 years of age receive the fourth planned dose level of oral resmetirom once daily for approximately 14 days following review of safety and PK data.
  • Drug: Resmetirom
    Resmetirom (MGL-3196) : Oral resmetirom administered once daily. Participants receive one of several protocol-defined dose levels assigned according to the sequential multiple ascending-dose study design. Dose escalation proceeds following review of available safety, pharmacokinetic, and pharmacodynamic data.

Recruiting Locations

Riley Hospital for Children at IU Health
Indianapolis, Indiana 46402

More Details

Status
Recruiting
Sponsor
Madrigal Pharmaceuticals, Inc.

Study Contact

Tom Hare
267-406-0611
info@madrigalpharma.com

Notice

Study information shown on this site is derived from ClinicalTrials.gov (a public registry operated by the National Institutes of Health). The listing of studies provided is not certain to be all studies for which you might be eligible. Furthermore, study eligibility requirements can be difficult to understand and may change over time, so it is wise to speak with your medical care provider and individual research study teams when making decisions related to participation.