Can Weight-Loss surgery beat drugs for advanced liver damage?
NCT ID NCT06374875
First seen Jul 31, 2026 · Last updated Jul 31, 2026
Summary
This trial compares two approaches for treating advanced metabolic dysfunction-associated steatohepatitis (MASH), a serious liver condition linked to obesity. About 120 adults with MASH and liver fibrosis will be randomly assigned to either metabolic surgery (gastric bypass or sleeve gastrectomy) or medical therapy with incretin-based drugs and other medications. After two years, a repeat liver biopsy will check whether each approach improves fibrosis without worsening MASH. The goal is to see which strategy better halts or reverses liver damage.
What this could mean
Our plain-language read of the trial. This is informational only, not medical advice or a prediction.
- Active substance
- Metabolic surgery (Roux-en-Y gastric bypass or sleeve gastrectomy) compared with incretin-based therapy (e.g., GLP-1 drugs) plus other medical treatments
- What this could lead to
- If surgery proves more effective than medication, it could establish a new standard for treating advanced MASH, potentially slowing or reversing liver damage and reducing the risk of cirrhosis or liver cancer.
- What could go wrong
- This is a relatively small trial (120 people) and results may not apply to everyone. Surgery carries risks like complications from anesthesia or the procedure itself, and the benefit over medication may not be as clear as hoped.
This is an AI summary of the original study and may miss details. Read our disclaimer.
Study facts
What this study's own registry entry says, in plain language.
- Phase
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Phase 4
Runs after approval, following long-term safety and how well the treatment works in everyday use.
- Participants
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About 120 people
The number the study aims to enrol. It can still change while the study runs.
- Started
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Jul 2024
- Expected to finish
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Dec 2029
An estimate. End dates often move.
- Lead sponsor
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Other sponsor
The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.
Who can take part
This study's own entry requirements. Only the study team can say for certain whether you qualify.
- Ages
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18 to 75 years
- Sex
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Anyone
- Healthy volunteers
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Accepted
You do not need to have the condition being studied to take part.
Show the full entry requirements Hide the full entry requirements
Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.
Inclusion Criteria Entry into the study would require that the patient: 1. Is a candidate for general anesthesia 2. Is eligible for metabolic surgery (RYGB or SG) based on the ASMBS/IFSO 2022 guidelines 3. Has insurance coverage for metabolic surgery (the requirements may vary in each country) 4. Is ≥18 and ≤75 years old at the time of signing the informed consent 5. Has a BMI ≥35 and ≤70 kg/m2 at the time of first study visit 6. FIB-4 ≥ 1.3 7. At least one of the following 5 criteria suggesting presence of advanced fibrosis: * LSM ≥ 12 kPa by VCTE using FibroScan® * LSM ≥ 12 kPa by SWE * LSM ≥ 1.7 m/s by ARFI * LSM ≥ 3.63 kPa MRE * ELF score ≥ 9.8 8. Patients with and without T2DM are eligible for the study. Patients with T2DM should have been on a stable dose of anti-diabetic medication (including insulin but not semaglutide or tirzepatide or liraglutide) for at least 3 months prior to entry, with glycated hemoglobin (HbA1c) ≤12%. 9. Self-reported stable weight in 6 months before the first study visit (no weight loss \>10% within 6 months prior to the first study visit) a. In patients with a historical noninvasive tests or liver biopsy, weight loss of no more than 10% is allowed from 6 months prior to the historical tests until the first study visit 10. Has the ability and willingness to participate in the study, provide informed consent, and agree to any of the arms involved in the study 11. Can understand the options and comply with the requirements of each arm, including one liver biopsy performed during the screening period (if no adequate biopsy within 12 months before screening is available) and one liver biopsy after 2-years 12. Has a negative urine pregnancy test at the first and at the randomization visits for women of childbearing potential. 13. Women of childbearing age must agree to use reliable method of contraception for 2 years 8.2 Exclusion Criteria Patients who meet the following criteria will be excluded from the study: 1. Known history of other chronic liver diseases (drug induced, viral hepatitis, autoimmune, and genetic): * Hepatitis B as detected by presence of hepatitis B surface antigen (HBsAg) * Hepatitis C as detected by presence of hepatitis C virus (HCV) RNA (in case the screening test for hepatitis C is positive, the confirmative test is decisive) * Autoimmune liver disease as diagnosed by antibodies or compatible liver histology * Primary biliary cirrhosis as defined by the presence of at least 2 criteria (elevated alkaline phosphatase, presence of anti-mitochondrial antibody, and histologic evidence of nonsuppurative destructive cholangitis and destruction of interlobular bile ducts) * Primary sclerosing cholangitis * Wilson's disease as diagnosed by low ceruloplasmin or compatible liver histology * Alpha-1-antitrypsin deficiency as diagnosed by alpha1-antitrypsin level or liver histology * Hemochromatosis as diagnosed by HFE mutations (C282Y, H63D), ferritin and transferrin saturation levels, or presence of 3+ or 4+ stainable iron on liver biopsy * Drug-induced liver disease diagnosed by medical history * Known bile duct obstruction * Suspected or proven liver cancer 2. Weight change \>10% within 6 months prior to the first study visit or prior to the historical liver biopsy 3. Treatment with semaglutide, tirzepatide, or liraglutide (for obesity or for T2DM) \<90 days before the first study visit. • However, patients are allowed to participate if they have been on a low dose (or are on older generation GLP-1 agonists) and have lost less than 10% of their body weight since starting the medication. 4. Type 1 diabetes or autoimmune diabetes 5. Known cases of human immunodeficiency virus infection 6. Prior bariatric and metabolic surgery of any kind • Reversed procedures such as gastric band or intragastric balloon that have been removed at least 3 months prior to the first study visit are allowed. 7. Prior complex foregut surgery including any esophageal and gastric surgeries, anti-reflux procedures, biliary diversion, and complex trauma surgery 8. Any surgery requiring general anesthesia within 1 month prior to signing the consent 9. History of solid organ transplant 10. Severe pulmonary disease defined as FEV1 \< 50% of predicted value 11. Significant cardiac or atherosclerotic disease (planned to undergo cardiac, coronary, carotid, or peripheral artery revascularization procedures in the next 12 months) 12. Severe uncompensated cardiopulmonary disease leading to American Society of Anesthesiologists Class IV or V 13. Classified as New York Heart Association Class IV 14. Left ventricular ejection fraction \<25% at the time of screening 15. Myocardial infarction, unstable angina, stroke, heart surgery, coronary stent placement in the past 6 months 16. Chronic renal insufficiency with eGFR below 30 mL/min/1.73 m2, or being on dialysis 17. Presence of large hiatal hernia (\>7 cm) 18. Presence of Crohn's disease 19. Psychiatric disorders including (but not limited to) dementia, active psychosis, severe depression requiring 3 or more medications, history of suicide attempts, active alcohol, or substance abuse within the previous 12 months that in the opinion of the investigators could disqualify the patient from metabolic surgery 20. Pregnancy, the intention of becoming pregnant, or not using adequate contraceptive measures 21. Breastfeeding 22. Diagnosis of malignancy within the preceding 3 years (except squamous cell and basal cell cancer of the skin) 23. Anemia defined as hemoglobin less than 9 g/dL 24. On therapeutic dose of anticoagulants such as warfarin or direct oral anticoagulants (DOACs) 25. Known history of clotting disorders, including pulmonary embolus and deep vein thrombosis 26. Clinical judgment that life expectancy is less than 3 years 27. Use of investigational therapy within 3 months prior to signing the consent 28. History of pancreatic carcinoma 29. Acute pancreatitis \< 180 days before screening 30. History or presence of chronic pancreatitis 31. Presence of concerning thyroid nodule 32. Uncontrolled thyroid disease: thyroid stimulating hormone (TSH) \> 6.0 mIU/L or \< 0.1 mIU/L before the first study visit * Patients receiving treatment for hypothyroidism can be included if their thyroid hormone replacement dose has been stable for at least 3 months. * Patients whose TSH is outside the rang but they have normal levels of thyroid hormones can be included. 33. A personal or family history of medullary thyroid carcinoma (MTC) or in patients with Multiple Endocrine Neoplasia syndrome type 2 (MEN 2) 34. Evidence or history of ascites or spontaneous bacterial peritonitis that require(d) treatment • Trace ascites identified only by an abdominal imaging without other evidence of clinically significant portal hypertension and esophageal varices is not an exclusion criterion. 35. Evidence or history of hepatic encephalopathy 36. Evidence or history of variceal bleeding 37. Evidence or history of portosplenic vein thrombosis 38. Current or history of significant alcohol consumption for a period of more than 3 consecutive months within 1 year prior to the first study visit. • Defined as more than 14 units/week for females (\>1 drink per day) and more than 21 units/week for males (\>2 drinks per day) on average, where one unit of alcohol is equivalent to a 12-oz beer, 4-ounce glass of wine, or 1-ounce shot of hard liquor. 39. Treatment with medications (for more than 14 consecutive days) with known effect on liver steatosis (e.g., treatment with systemic corticosteroids \[oral or intravenous\], methotrexate, tamoxifen, valproic acid, amiodarone, or tetracycline) in the 3 months prior to the first study visit (or historical liver biopsy). 40. ALT or AST or Alkaline phosphatase \>200 U/L 41. Recurrent major hypoglycemia or hypoglycemic unawareness 42. Inability to safely obtain a liver biopsy 43. Any condition or major illness that, in the investigator's judgment, places the subject at undue risk by participating in the study 44. Unable to understand the risks, benefits, and compliance requirements of study 45. Lack capacity to give informed consent 46. Plans to move outside the primary location of study (country) within the next 24 months 47. Known or suspected allergy to semaglutide, tirzepatide, liraglutide, excipients, or related products 48. Previous participation in this trial and got randomized to one of the study groups but did not proceed. 49. Hospitalization due to COVID-19 within 2 months prior to screening. 50. Platelet count \<80,000 51. International Normalized Ratio (INR) \>1.7 52. Child-Pugh score B or C 53. MELD score ≥15 54. Upper endoscopy showing gastroesophageal varices 55. Upper endoscopy showing more than mild portal hypertensive gastropathy 56. Liver vascular ultrasound (duplex ultrasonography) showing significant portal hypertension characterized by dilated portal vein (\>13 mm), biphasic or reverse flow in the portal vein, enlarged paraumbilical veins, splenorenal collaterals, or dilated left and short gastric veins. Note: Negative findings on upper endoscopy and liver duplex ultrasound (done within one year of the first study visit for both tests) are necessary to establish eligibility for the FLAMES. * Ruling out clinically significant portal hypertension is particularly important in patients with a liver stiffness ≥20 kPa or with a platelet count \<150,000 per μL or with a (historical) liver biopsy showing cirrhosis. * A subset of patients without having upper endoscopy and liver duplex ultrasound can be eligible for enrollment if their: * liver stiffness (by transient elastography using FibroScan®) is between 12 and 15 kPa and their platelet count is \>150,000 per μL, or * a (historical) liver biopsy showing absence of cirrhosis, or * a (historical) HVPG \< 5 mmHg 57. Cross-sectional abdominal imaging (if available historically) indicating presence of large portosystemic collaterals or ascites • Splenomegaly alone (in the absence of other radiological and laboratory findings) is not considered to be a sign of clinically significant portal hypertension and is not an exclusion criterion. 58. HVPG ≥ 12 mmHg (if available historically or if measured at the time of de novo liver biopsy) 59. Liver biopsy characteristics: * F0 in de novo biopsy; Enrollment cap of 20% for F1 in de novo biopsy. * F0 and F1 in historical liver biopsy * Absence of all three components of MASH (steatosis, hepatocyte ballooning, and lobular inflammation) in patients with F1, F2, and F3 * Absence of steatosis (\<5%) in patients with F4 * Diagnosis other than MASH
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Conditions
The condition(s) this trial relates to.
As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.
How to take part
Only the study team decides who joins. These are the ways to reach them.
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The places running it
22 sites in 13 countries. The list below names each one and where it is.
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The official record
ClinicalTrials.gov lists the study team's own contact details, including names and phone numbers. We don't republish those.
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A doctor treating you
A doctor who knows your case can contact a study site on your behalf, and can tell you whether this study is worth pursuing at all.
Contacts and locations
Locations
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Banner Health Center
NOT_YET_RECRUITINGPhoenix, Arizona, 85006, United States
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Clarunis Universitäres
NOT_YET_RECRUITINGBasel, Switzerland
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Cleveland Clinic
RECRUITINGCleveland, Ohio, 44195, United States
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Hospital Alemão Oswaldo Cruz
RECRUITINGSão Paulo, Brazil
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Hospital Clínic Barcelona
NOT_YET_RECRUITINGBarcelona, Spain
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Hôpitaux universitaires de Genève
NOT_YET_RECRUITINGGeneva, Switzerland
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Indiana University
NOT_YET_RECRUITINGIndianapolis, Indiana, 46202, United States
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Instituto Nacional de Ciencias Médicas y Nutrición Salvador
NOT_YET_RECRUITINGMexico City, Mexico
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King's College Hospital
NOT_YET_RECRUITINGLondon, United Kingdom
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Kuwait University
NOT_YET_RECRUITINGKuwait City, Kuwait
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Linköping University
NOT_YET_RECRUITINGLinköping, Sweden
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Mayo Clinic
NOT_YET_RECRUITINGRochester, Minnesota, 55905, United States
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McGill University
NOT_YET_RECRUITINGMontreal, Canada
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Nuffield Health Bristol Hospital
NOT_YET_RECRUITINGBristol, United Kingdom
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Queen Mary University
NOT_YET_RECRUITINGLondon, United Kingdom
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Sapienza Università di Roma
NOT_YET_RECRUITINGRoma, Italy
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Sri Aurobindo Institute of Medical Sciences
NOT_YET_RECRUITINGIndore, India
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The Digestive Health Institute
NOT_YET_RECRUITINGMumbai, India
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Turku University Hospital
NOT_YET_RECRUITINGTurku, Finland
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University College Dublin
NOT_YET_RECRUITINGDublin, Ireland
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Università Cattolica del Sacro Cuore
NOT_YET_RECRUITINGMilan, Italy
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Örebro University
NOT_YET_RECRUITINGÖrebro, Sweden
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