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Graves DiseasePhase 1NCT07305818

NEXUS Study: A Study to Test Single and Multiple Doses of MER511 Given to Adults With Graves' Disease

A Phase 1 study testing MER511 (IV), MER511 (SC) and MER511 (SC) for MAD in people with Graves Disease, run by Merida Biosciences at 16 sites in 2 countries.

Recruiting

Looking for participants now. Contact the study team or a site below to ask about taking part.

Sites and contacts
Official record
Search all trials

Trial summary

The purpose of this study is to evaluate how well MER511 is tolerated and what side effects may occur in adults who have Graves' disease. The study drug will be administered either intravenously (into a vein in the arm) or subcutaneously (under the skin). Read more about this study

Who is it for?
Ages 18 to 65 years
Conditions the study is for
Graves Disease
What is being tested?
MER511 (IV), MER511 (SC) and MER511 (SC) for MAD
Type of treatment
Injection or infusion
Could I receive a placebo?
Yes, some participants may receive a placebo
How many people
100 participants
Where
16 sitesin 2 countries
Study dates
19 Dec 2025to 24 Jul 2028
Phase
Phase 1
Are there results?
Not yet: the study is under way

Key requirements

Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.

  • Ages 18 to 65 years
  • All sexes
  • No healthy volunteers
  • Adult, Older adult

Who may be able to join

  • Adults 18 to 65 years of age, inclusive, at the time of signing the ICF
  • Documented GD diagnosis,
  • Receiving stable dose of ATD (Antithyroid drug)
  • Body weight at least 50 kg (110 lb) and body mass index (BMI) 18.0-35.0 kg/m2, inclusive
  • Women of childbearing potential must agree to use highly effective contraceptive methods
  • Men with partners of childbearing potential or who are pregnant must agree to use a condom or strict abstinence
  • Signed informed consent to participate in the study
  • Willingness and ability, in the opinion of the investigator, to comply with protocol requirements and restrictions (eg, dosing, schedule of assessments).

Who cannot join

  • History of:
  • total thyroidectomy.
  • History of hyperthyroidism not caused by GD (eg, toxic adenoma, toxic multinodular goiter).
  • History of thyroid storm.
  • History of agranulocytosis, anemia, leukopenia, thrombocytopenia, vasculitis, or liver toxicity due to prior ATD therapy Treatment with RAI therapy within 12 months prior to Screening
  • Likely to require definitive treatment for GD (RAI therapy or thyroidectomy) during the study, based on GD history and anticipated prognosis.
Show all 37Show fewer
  • Use of levothyroxine, desiccated thyroid extract, or T3 at any dose within 6 weeks prior to Screening.
  • Current active or chronic moderate-to-severe TED per EUropean Group On Graves' Orbitopathy (EUGOGO) criteria as judged by the investigator at Screening
  • History of TED-directed medical treatment (including IV/oral steroids, immunosuppressants, or teprotumumab), surgical treatment, and/or orbital radiation within 3 months prior to Screening, or per required prohibited concomitant therapy washout criteria in the protocol (whichever is longer)
  • Major surgery or use of iodinated contrast within 3 months prior to planned IMP dosing.
  • Active systemic autoimmune disease requiring treatment that causes undue risk in the opinion of the investigator.
  • History of cardiovascular, respiratory, renal, gastrointestinal, endocrinological (other than GD), hematological, immunodeficiency, or neurological disorders that may constitute a risk when taking the IMP or interfere with data interpretation.
  • History of liver disease
  • Pregnant, breastfeeding, or planning to become pregnant during the study
  • Treatment with prohibited medications prior to planned IMP dosing or likely to require prohibited concomitant therapy during the study
  • Live vaccine(s) or mRNA vaccine(s) within 1 month prior to IMP dosing, or plans to receive such vaccines during the study
  • Treatment with any investigational drug within within 3 months or 5 half-lives (whichever is longer) prior to enrollment
  • Total IgG level <700 mg/dL at Screening
  • Any of the following at Screening (confirmed by single repeat measurement, if deemed necessary):
  • ALT or AST >1.5 × ULN
  • Total bilirubin >1.5 × ULN
  • Estimated glomerular filtration rate (eGFR) <75 mL/min/1.73 m2 using the Chronic Kidney Disease Epidemiology Collaboration (CKD-EPI) creatinine equation
  • Positive result for HIV antibody, HBsAg, or hepatitis C antibody with detectable viral RNA levels at Screening
  • Positive drug screen or positive test for alcohol
  • 12-lead ECG demonstrating any of the following at Screening:
  • QTcF interval >450 ms
  • QRS interval >120 ms
  • PR interval >220 ms
  • Blood pressure measurements demonstrating any of the following at Screening:
  • Systolic blood pressure ≥140 mmHg
  • Diastolic blood pressure ≥90 mmHg
  • Heart rate <45 bpm or >100 bpm
  • Donated more than 500 mL of blood in the 2 months prior to signing the ICF
  • Current enrollment or past participation within 3 months or 5 half-lives (whichever is longer) prior to signing the ICF in any other clinical trial involving an IMP
  • Refusal to adhere to lifestyle considerations as defined in the protocol
  • Employee of the investigator, clinic, or sponsor with direct involvement in the proposed study or other studies under the direction of the investigator or clinic, as well as family members of the employee or investigator
  • Any other conditions that, in the opinion of the investigator or the sponsor, could interfere with participation in or completion of the study

Trial locations and contacts

16 sites in 2 countries. Contact the study team or a site near you to ask about taking part.

16 sites in 2 countries

United States11 sites, 11 recruiting
  • Site # 1107

    Boston, Massachusetts, 02114

    Principal Investigator, 339-255-3030, clinicaltrials@meridabio.com

    Recruiting
  • Site # 1104

    Columbus, Ohio, 43203

    Principal Investigator, 339-255-3030, clinicaltrials@meridabio.com

    Recruiting
  • Site # 1113

    DeSoto, Texas, 75115

    Principal Investigator, 339-255-3030, clinicaltrials@meridabio.com

    Recruiting
  • Site # 1101

    Hollywood, Florida, 33024

    Principal Investigator, 339-255-3030, clinicaltrials@meridabio.com

    Recruiting
  • Site # 1112

    Miami, Florida, 33125

    Principal Investigator, 339-255-3030, clinicaltrials@meridabio.com

    Recruiting
  • Site # 1106

    Morehead City, North Carolina, 28557

    Principal Investigator, 339-255-3030, clinicaltrials@meridabio.com

    Recruiting
  • Site # 1108

    Philadelphia, Pennsylvania, 19107

    Principal Investigator, 339-255-3030, clinicaltrials@meridabio.com

    Recruiting
  • Site # 1102

    Rochester, Minnesota, 55905

    Principal Investigator, 339-255-3030, clinicaltrials@meridabio.com

    Recruiting
  • Site # 1111

    Torrance, California, 90502

    Principal Investigator, 339-255-3030, clinicaltrials@meridabio.com

    Recruiting
  • Site # 1105

    Webster, Texas, 77598

    Principal Investigator, 339-255-3030, clinicaltrials@meridabio.com

    Recruiting
  • Site # 1109

    Wesley Chapel, Florida, 33544

    Principal Investigator, 339-255-3030, clinicaltrials@meridabio.com

    Recruiting

Other trials in United States

Spain5 sites, 5 recruiting
  • Site # 2205

    A Coruña, 15006

    Principal Investigator, 339-255-3030, clinicaltrials@meridabio.com

    Recruiting
  • Site # 2204

    Barcelona, 08017

    Principal Investigator, 339-255-3030, clinicaltrials@meridabio.com

    Recruiting
  • Site # 2206

    Barcelona, 08023

    Principal Investigator, 339-255-3030, clinicaltrials@meridabio.com

    Recruiting
  • Site # 2202

    Santander, 39008

    Principal Investigator, 339-255-3030, clinicaltrials@meridabio.com

    Recruiting
  • Site # 2201

    Seville, 41009

    Principal Investigator, 339-255-3030, clinicaltrials@meridabio.com

    Recruiting

Other trials in Spain

About this study

Official title: A Phase 1, First-in-Human, Placebo-Controlled, Single and Multiple Ascending Dose Study to Evaluate Safety, Tolerability, Pharmacokinetics, Pharmacodynamics, and Immunogenicity of Intravenous and Subcutaneous Administration of MER511 in Adults With Graves' Disease

The purpose of this study is to evaluate how well MER511 is tolerated and what side effects may occur in adults who have Graves' disease. The study drug will be administered either intravenously (into a vein in the arm) or subcutaneously (under the skin).

Blood tests will be performed to investigate how the body processes the study drug and how the study drug affects the body.

Read the detailed description

This Phase 1, first-in-human, multicenter study will evaluate the safety, tolerability, pharmacokinetics (PK), pharmacodynamics (PD), and immunogenicity of single and multiple ascending doses of MER511 administered to adults (18 to 65 years of age, inclusive) with GD (Graves' disease).

The study will consist of 2 sequential parts: a single ascending dose (SAD) part (Part A) followed by a multiple ascending dose (MAD) part (Part B).

Part A will employ a placebo-controlled, sponsor-open, participant- and investigator-blind design to evaluate the safety, tolerability, PK, PD, and immunogenicity of single ascending intravenous doses and a single subcutaneous dose of MER511.

Part B will employ a placebo-controlled, sponsor-open, participant- and investigator-blind design to assess the safety, tolerability, PK, PD, and immunogenicity of multiple subcutaneous doses of MER511.

Conditions
Graves Disease
Being tested
MER511 (IV), Placebo comparator (IV), MER511 (SC), Placebo comparator (SC), MER511 (SC) for MAD
Keywords
Graves' Disease, Hyperthyroidism, Basedow disease, Exophthalmic goitre, TSHR, Autoimmune, Anti-thyroid drugs, Autoimmune thyroid disease
Medical subject headings
Graves Disease, Hyperthyroidism

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

  • MER511 (IV)Biological

    Participants will receive a single dose of MER511 on Day 1

  • Placebo comparator (IV)Biological

    Participants will receive a single dose of Placebo on Day 1

  • MER511 (SC)Biological

    Participants will receive a single dose of MER511 on Day 1

  • Placebo comparator (SC)Biological

    Participants will receive a single dose of Placebo on Day 1

  • MER511 (SC) for MADBiological

    Participants will receive multiple ascending doses of MER511 via SC administration assigned for their cohort on Day 1 and Day 29

  • Placebo comparator (SC) for MADBiological

    Participants will receive multiple doses of placebo via SC administration assigned for their cohort on Day 1 and Day 29

Study groups in NCT07305818
Study groupRoleWhat they receive
Part A (SAD) MER511 IVExperimentalFor Cohorts 1-7 , each cohort participant will receive a single ascending dose of MER511 via IV administration on Day 1
Receives: Biological: MER511 (IV)
Part A (SAD) placebo IVPlacebo comparatorFor Cohorts 1-7, each cohort participant will receive a single dose of placebo via IV administration on Day 1
Receives: Biological: Placebo comparator (IV)
Part A (SAD) MER511 SCExperimentalFor Cohort 8, participants will receive a single dose of MER511 (determined from Cohort 1-7) via SC administration on Day 1
Receives: Biological: MER511 (SC)
Part A (SAD) placebo SCPlacebo comparatorFor Cohort 8, participants will receive a single dose of placebo (determined from Cohort 1-7) via SC administration on Day 1
Receives: Biological: Placebo comparator (SC)
Part B (MAD) MER511 SCExperimentalUp to 3 cohorts of participants will receive multiple ascending doses of MER511 via SC administration assigned for their cohort on Day 1 and Day 29
Receives: Biological: MER511 (SC) for MAD
- Part B (MAD) placebo SCPlacebo comparatorUp to 3 cohorts of participants will receive multiple doses of placebo via SC administration assigned for their cohort on Day 1 and Day 29
Receives: Biological: Placebo comparator (SC) for MAD

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. Number of participants with TEAEs (Treatment-emergent adverse events)

    Adverse events that start or worsen in severity after the start of study drug will be categorized as TEAEs

    Measured: - Part A (SAD) Cohorts: Day 1 up to Week 16 - Part B (MAD) Cohorts: Day 1 up to Week 24

  2. Number of participants with clinically significant changes in ECGs, vital signs, clinical laboratory values, and physical examination

    Incidence of clinically significant abnormalities in ECGs, vital signs, clinical laboratory values, and physical examination

    Measured: - Part A (SAD) Cohorts: Day 1 up to Week 16 - Part B (MAD) Cohorts: Day 1 up to Week 24

Secondary outcomes (5)
  1. Serum Cmax (Maximum observed concentration)

    Measurement of the maximum observed concentration

    Measured: - Part A (SAD) Cohorts: Day 1 (Week 0 dosing day) through Week 16- Part B (MAD) Cohorts: Day 1 (Week 0 dosing Day) Through Week 24

  2. Serum tmax (Time to maximum concentration)

    Measurement of the time to maximum observed concentration

    Measured: - Part A (SAD) Cohorts: Day 1 (Week 0 dosing day) Through Week 16 - Part B (MAD) Cohorts: Day 1 (Week 0 dosing day) Through Week 24

  3. Serum AUCinf (area under concentration-time curve from time zero to infinity)

    Measurement of area under concentration-time curve from time zero to infinity

    Measured: Part A (SAD) Only: Day 1 (Week 0) Dosing Through Week 16

  4. Serum AUC0-tau (area under concentration-time curve during the dosing interval)

    Measurement of area under concentration-time curve during the dosing interval

    Measured: Part B (MAD) Only: Day 1 (Week 0) Dosing Through Week 24

  5. Number of participants with ADAs (Anti-drug antibody)

    Blood samples will be collected to evaluate the immunogenicity of MER511 in participants with GD (Graves' disease)

    Measured: - Part A (SAD) Cohorts: Day 1 (Week 0) Dosing Through Week 16 or Early Discontinuation - Part B (MAD) Cohorts: Day 1 (Week 0) Dosing Through Week 24

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted26 Dec 2025
  2. Study start19 Dec 2025
  3. Primary completion24 Jul 2028 (estimated)
  4. Study completion24 Jul 2028 (estimated)

Resources

More details

For doctors and researchers: how the study is designed, who runs it, and its registry IDs.

Study design
Study type
Interventional
Phase
Phase 1
Primary purpose
Treatment
Allocation
Randomised
Intervention model
Sequential
Model description
The study will enroll cohorts of participants who will be assigned to a dose group for Part A and Part B.
Masking
Double blind
Who is masked
Participant, Investigator
Enrolment
100 participants (estimated)
IDs, dates and publications
ClinicalTrials.gov ID
NCT07305818
Sponsor's protocol ID
MER511-1001
Other IDs
2025-523823-23-00, 2025
Status last verified
Sep 2026
First submitted
12 Dec 2025
Last updated
30 Sep 2026
Results posted
No
Data monitoring committee
No
FDA-regulated drug
Yes
FDA-regulated device
No
Individual data sharing
No

Questions about this trial

What is this clinical trial studying?

A Phase 1 study testing MER511 (IV), MER511 (SC) and MER511 (SC) for MAD in people with Graves Disease, run by Merida Biosciences at 16 sites in 2 countries.

The full registered description is in the About this study section and the official record.

Who may be eligible to take part?

The sponsor lists 8 inclusion and 37 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.

Is this clinical trial currently recruiting?

The record says: looking for participants now, as of the sponsor's last update on 30 Sep 2026. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 16 sites in United States, Spain. Whether a site is taking part right now should be confirmed with that site. See every site.

What are the possible benefits and risks?

They depend on the study and the treatment, and no study can promise a benefit. Some participants in this study may receive a placebo. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.

What does this phase mean?

Phase 1 studies test a treatment in a small group of people for the first time or in a new way, mainly to check safety and find the right dose.

Not every study follows the same path, and some studies (observational studies, device studies) have no phase.

Are results available for this study?

This study is still under way. Results are not available in the source record yet.

How can a doctor refer a patient or contact the research team?

Contact Clinical Operations (+1 339-255-3030, clinicaltrials@meridabio.com), or a site near the patient. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

Number of participants with TEAEs (Treatment-emergent adverse events) (time frame: - Part A (SAD) Cohorts: Day 1 up to Week 16 - Part B (MAD) Cohorts: Day 1 up to Week 24). The study lists 2 primary outcomes in all. It is what the study was designed to measure, not a finding.

Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?

No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.

How often is this information updated?

AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 30 Sep 2026.

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