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Brown Adipose Tissue as a Mechanistic Determinant of Semaglutide Treatment Response in Obesity (BAT-Sema Study) (BAT-Sema)

20 de julho de 2026 atualizado por: Hun Jee Choe, Hallym University

Brown Adipose Tissue as a Mechanistic Determinant of GLP-1 Receptor Agonist Treatment Response in Adults With Obesity: A Multicenter Prospective Cohort Study Using ¹⁸FDG-PET/CT and Cold Stimulation Protocol

This study investigates whether the activity of brown adipose tissue (BAT) - a special type of fat that burns energy as heat - can predict how well individuals with obesity respond to semaglutide (Wegovy), a once-weekly injectable weight loss medication. Participants who are starting semaglutide treatment will undergo ¹⁸FDG-PET/CT imaging before and after 24 weeks of treatment. Prior to each PET/CT scan, participants will wear a water-circulating cooling vest to activate BAT. By measuring BAT activity at baseline and comparing it with the degree of weight loss and metabolic improvement at 24 weeks, the investigators aim to identify BAT as a predictive biomarker for personalized obesity treatment.

Visão geral do estudo

Descrição detalhada

Despite the remarkable efficacy of semaglutide (GLP-1 receptor agonist) in treating obesity, considerable individual variation in treatment response remains unexplained. Brown adipose tissue (BAT) is a metabolically active thermogenic organ that has been implicated in energy expenditure, insulin sensitivity, and cardiometabolic health. We hypothesize that baseline BAT activity, as measured by ¹⁸FDG-PET/CT following individualized cold stimulation, is a mechanistic determinant of semaglutide treatment response in adults with obesity without diabetes.

This multicenter prospective cohort study will enroll 80 adults (40 per site: Hallym University Dongtan Sacred Heart Hospital and Seoul National University Bundang Hospital) with BMI ≥27 kg/m² plus obesity-related comorbidity, or BMI ≥30 kg/m², who are initiating semaglutide therapy. ¹⁸FDG-PET/CT with standardized cold stimulation (water-circulating cooling vest, starting at 16°C, individualized to prevent shivering) will be performed at baseline (V1) and 24 weeks (V7). BAT activity (SUVmax, SUVmean, BAT volume, total metabolic activity) will be quantified per BARCIST 1.0 criteria. Liver fat fraction (MRI-PDFF) and liver stiffness (MR elastography) will be assessed as secondary endpoints. Correlations between baseline BAT parameters and treatment outcomes (% body weight loss, metabolic biomarker changes) will be analyzed.

Tipo de estudo

Intervencional

Inscrição (Estimado)

80

Estágio

  • Não aplicável

Contactos e Locais

Esta seção fornece os detalhes de contato para aqueles que conduzem o estudo e informações sobre onde este estudo está sendo realizado.

Contato de estudo

  • Nome: Hun Jee Choe Hallym University Dongtan Sacred Heart Hospital, MD, PhD
  • Número de telefone: +82-31-8086-2869
  • E-mail: hunjeechoe@gmail.com

Estude backup de contato

  • Nome: Hye Jeong Lee Hallym University Dongtan Sacred Heart Hospital, CRC
  • Número de telefone: +82-10-4694-3886
  • E-mail: geumzzogi@naver.com

Locais de estudo

    • Gyeonggi-do
      • Hwaseong-si, Gyeonggi-do, Coréia do Sul, 18450
        • Hallym University Dongtan Sacred Heart Hospital
        • Contato:
          • Hun Jee Choe Hallym University Dongtan Sacred Heart Hospital, MD, PhD
          • Número de telefone: +82-10-9493-5703
          • E-mail: hunjeechoe@gmail.com
      • Seongnam-si, Gyeonggi-do, Coréia do Sul, 13620
        • Seoul National University Bundang Hospital
        • Contato:
          • Soo Lim Seoul National University Bundang Hospital, MD, PhD
          • Número de telefone: +82-10-9766-2706
          • E-mail: limsoo@snu.ac.kr
        • Contato:
          • Soo Lim Seoul National University Bundang Hospital, MD, PhD
          • Número de telefone: +82-010-9766-2706
          • E-mail: limsoo@snu.ac.kr

Critérios de participação

Os pesquisadores procuram pessoas que se encaixem em uma determinada descrição, chamada de critérios de elegibilidade. Alguns exemplos desses critérios são a condição geral de saúde de uma pessoa ou tratamentos anteriores.

Critérios de elegibilidade

Idades elegíveis para estudo

  • Adulto
  • Adulto mais velho

Aceita Voluntários Saudáveis

Não

Descrição

Inclusion Criteria:

  1. Age 20-70 years at the time of enrollment
  2. Initiating semaglutide (Wegovy) treatment for obesity (newly starting treatment)
  3. BMI ≥ 27 kg/m² with at least one weight-related comorbidity:

    • Hypertension (SBP ≥130 or DBP ≥80 mmHg, or on antihypertensive medication)
    • Dyslipidemia (LDL-C ≥130, TG ≥150, or low HDL-C, or on lipid-lowering medication)
    • Non-alcoholic fatty liver disease (NAFLD/MASLD, confirmed by imaging or ALT/AST ≥1.5× ULN)
    • Obstructive sleep apnea (AHI ≥5/hr or clinically diagnosed)
    • Established cardiovascular disease (CAD, stroke, PAD)
    • Obesity-related osteoarthritis of knee or hip with functional impairment OR BMI ≥ 30 kg/m² (regardless of comorbidity)
  4. Ability and willingness to provide written informed consent

Exclusion Criteria:

  1. Diagnosis of type 1 or type 2 diabetes mellitus
  2. History of neck surgery or radiation therapy to the neck
  3. Use of anti-obesity medications within 1 month prior to enrollment, or current use of beta-adrenergic blocking agents
  4. Personal or family history of medullary thyroid carcinoma or multiple endocrine neoplasia type 2 (MEN2)
  5. Active malignancy, severe renal disease (eGFR <30 mL/min/1.73m²), severe hepatic disease, or other severe endocrine disorders
  6. Pregnancy or breastfeeding
  7. Severe psychiatric illness or cognitive impairment precluding informed consent
  8. Contraindication to MRI (pacemaker, cochlear implant, non-MRI-compatible implants)
  9. Severe claustrophobia

Plano de estudo

Esta seção fornece detalhes do plano de estudo, incluindo como o estudo é projetado e o que o estudo está medindo.

Como o estudo é projetado?

Detalhes do projeto

  • Finalidade Principal: Ciência básica
  • Alocação: N / D
  • Modelo Intervencional: Atribuição de grupo único
  • Mascaramento: Nenhum (rótulo aberto)

Armas e Intervenções

Grupo de Participantes / Braço
Intervenção / Tratamento
Experimental: Semaglutide + BAT Evaluation
Adults with obesity initiating semaglutide (0.25 mg → 2.4 mg over 20 weeks, maintained for 4 weeks; total 24 weeks). At baseline and 24 weeks, ¹⁸FDG-PET/CT with individualized cold stimulation (water-circulating cooling vest at 16°C, 60 minutes) and liver MRI (PDFF + MRE) are performed.
Once-weekly subcutaneous injection, titrated from 0.25 mg to 2.4 mg over 20 weeks per standard protocol. Standard of care treatment for obesity.
Whole-body ¹⁸FDG-PET/CT (5.18 MBq/kg, max 370 MBq) after 60-minute individualized cold stimulation using a water-circulating cooling vest (Polar Products Arctic Chiller, starting 16°C). Performed at baseline (V1) and 24 weeks (V7). BAT activity quantified per BARCIST 1.0.
Hepatic proton density fat fraction (MRI-PDFF) and liver stiffness by MR elastography (MRE) using Siemens MAGNETOM Vida 3T. Performed at baseline (V1) and 24 weeks (V7).

O que o estudo está medindo?

Medidas de resultados primários

Medida de resultado
Descrição da medida
Prazo
Correlation between baseline BAT metabolic activity (SUVmean and BAT volume on ¹⁸FDG-PET/CT) and percentage body weight loss at 24 weeks of semaglutide treatment
Prazo: Baseline to 24 weeks
: Pearson (or Spearman) correlation coefficient between baseline BAT parameters (SUVmean, BAT volume, total metabolic activity per BARCIST 1.0) and % body weight loss after 24 weeks of semaglutide therapy (0.25 mg escalated to 2.4 mg).
Baseline to 24 weeks

Medidas de resultados secundários

Medida de resultado
Descrição da medida
Prazo
Change in waist circumference
Prazo: Baseline to 24 weeks
Baseline to 24 weeks
Change in body weight (kg)
Prazo: Baseline to 24 weeks
Baseline to 24 weeks
Change in Body Mass Index (BMI)
Prazo: Baseline to 24 weeks
Baseline to 24 weeks
Change in HbA1c (%)
Prazo: Baseline to 24 weeks
Baseline to 24 weeks
Change in fasting glucose (mg/dL)
Prazo: Baseline to 24 weeks
Baseline to 24 weeks
Change in HOMA-IR
Prazo: Baseline to 24 weeks
Baseline to 24 weeks
Change in fasting lipids (LDL-C, HDL-C, TG, TC)
Prazo: Baseline to 24 weeks
Baseline to 24 weeks
Change in body composition by BIA (fat mass, lean mass, skeletal muscle mass)
Prazo: Baseline to 24 weeks
Baseline to 24 weeks
Change in liver fat fraction (MRI-PDFF, %)
Prazo: Baseline to 24 weeks
Baseline to 24 weeks
Change in liver stiffness by MRE (kPa)
Prazo: Baseline to 24 weeks
Baseline to 24 weeks
Change in adipokines (adiponectin, leptin, NEFA)
Prazo: Baseline to 24 weeks
Baseline to 24 weeks
Change in hsCRP
Prazo: Baseline to 24 weeks
Baseline to 24 weeks
BAT-positive rate based on SUVmax at baseline
Prazo: Baseline
The percentage of participants determined as brown adipose tissue (BAT)-positive, defined by a maximum standardized uptake value (SUVmax) of 1.5 or higher ($\ge 1.5$) at baseline.
Baseline
Change in Quality of life using the Impact of Weight on Quality of Life-Lite Clinical Trials (IWQOL-Lite-CT) total score
Prazo: Baseline to 24 weeks
The Impact of Weight on Quality of Life-Lite Clinical Trials (IWQOL-Lite-CT) is a self-report questionnaire used to assess the quality of life in individuals with obesity. The total score ranges from a minimum of 0 to a maximum of 100, where higher scores indicate a better outcome (better quality of life).
Baseline to 24 weeks
Change in Quality of Life using the Short Form-36 Health Survey Version 2 (SF-36v2) domain scores
Prazo: Baseline to 24 weeks
The Short Form-36 Health Survey Version 2 (SF-36v2) is a 36-item questionnaire measuring health-related quality of life across 8 domains: Physical Functioning, Role-Physical, Bodily Pain, General Health, Vitality, Social Functioning, Role-Emotional, and Mental Health. Each domain score ranges from a minimum of 0 to a maximum of 100, where higher scores indicate a better outcome (better health status or higher quality of life).
Baseline to 24 weeks
Change in BAT activity (SUVmax, SUVmean, BAT volume, TMA) from baseline to 24 weeks
Prazo: Baseline to 24 weeks
Baseline to 24 weeks
BAT-positive rate based on CT Hounsfield Units (HU) at baseline
Prazo: Baseline
The percentage of participants determined as brown adipose tissue (BAT)-positive, defined by Computed Tomography Hounsfield Units (CT HU) within the range of $-250$ to $-50$ at baseline.
Baseline

Colaboradores e Investigadores

É aqui que você encontrará pessoas e organizações envolvidas com este estudo.

Datas de registro do estudo

Essas datas acompanham o progresso do registro do estudo e os envios de resumo dos resultados para ClinicalTrials.gov. Os registros do estudo e os resultados relatados são revisados ​​pela National Library of Medicine (NLM) para garantir que atendam aos padrões específicos de controle de qualidade antes de serem publicados no site público.

Datas Principais do Estudo

Início do estudo (Estimado)

1 de junho de 2026

Conclusão Primária (Estimado)

1 de fevereiro de 2028

Conclusão do estudo (Estimado)

1 de fevereiro de 2031

Datas de inscrição no estudo

Enviado pela primeira vez

20 de maio de 2026

Enviado pela primeira vez que atendeu aos critérios de CQ

27 de maio de 2026

Primeira postagem (Real)

2 de junho de 2026

Atualizações de registro de estudo

Última Atualização Postada (Real)

22 de julho de 2026

Última atualização enviada que atendeu aos critérios de controle de qualidade

20 de julho de 2026

Última verificação

1 de julho de 2026

Mais Informações

Termos relacionados a este estudo

Plano para dados de participantes individuais (IPD)

Planeja compartilhar dados de participantes individuais (IPD)?

NÃO

Descrição do plano IPD

Individual participant data will not be shared publicly. De-identified aggregate results will be published in peer-reviewed journals

Informações sobre medicamentos e dispositivos, documentos de estudo

Estuda um medicamento regulamentado pela FDA dos EUA

Não

Estuda um produto de dispositivo regulamentado pela FDA dos EUA

Não

Essas informações foram obtidas diretamente do site clinicaltrials.gov sem nenhuma alteração. Se você tiver alguma solicitação para alterar, remover ou atualizar os detalhes do seu estudo, entre em contato com register@clinicaltrials.gov. Assim que uma alteração for implementada em clinicaltrials.gov, ela também será atualizada automaticamente em nosso site .

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