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HER2-Expressing Solid TumorsPhase 1NCT07334119

Safety, Pharmacokinetics, Pharmacodynamics and Preliminary Efficacy of MT-304 in Adults With Advanced HER2-Expressing Solid Tumors

A Phase 1 study testing MT-304 and MT-304 + Nivolumab in people with HER2-Expressing Solid Tumors, run by Myeloid Therapeutics at 7 sites in Australia.

Recruiting

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

Sites and contacts
Official record
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Trial summary

This clinical trial is designed to evaluate the safety, pharmacokinetics, pharmacodynamics, and preliminary efficacy of MT-304 in adults with advanced HER2-expressing solid tumors. Read more about this study

Who is it for?
Ages 18 years and older
Conditions the study is for
HER2-Expressing Solid Tumors
What is being tested?
MT-304 and MT-304 + Nivolumab
Type of treatment
Injection or infusion
Could I receive a placebo?
No, everyone receives an active treatment
How many people
60 participants
Where
7 sitesAustralia
Study dates
25 Nov 2025to 30 Mar 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 years and older
  • All sexes
  • No healthy volunteers
  • Adult, Older adult

Who may be able to join

  • Aged 18 years or above
  • Histologically confirmed diagnosis of metastatic or advanced epithelial cancer expressing HER2 (Note: Participants with other tumor types expressing HER2 may be considered pending discussion with the Medical Monitor).
  • Measurable lesion per RECIST 1.1 criteria.
  • Eastern Cooperative Oncology Group (ECOG) performance status Grade of 0 or 1.
  • Adequate Organ function

Who cannot join

  • Known active CNS metastasis and/or carcinomatous meningitis.
  • Any acute illness including fever.
  • History of symptomatic congestive heart failure
  • History of (noninfectious) pneumonitis/interstitial lung disease that required steroids or has current pneumonitis/interstitial lung disease.
  • Uncontrolled pleural effusion, pericardial effusion, or ascites
  • Active autoimmune disease not related to prior therapy for primary malignancy that has required systemic therapy in the last 1 year.

Trial locations and contacts

7 sites in 1 country. Contact the study team or a site near you to ask about taking part.

7 sites in 1 country

Australia7 sites, 7 recruiting
  • Cancer Research SA Pty Ltd

    Adelaide, South Australia, 5000

    Dr Meena Okera, +61883592565

    Dr Meena Okera

    Recruiting
  • The Kinghorn Cancer Centre

    Darlinghurst, New South Wales, 2010

    Dr Rasha Cosman, +61393555655

    Dr Rasha Cosman

    Recruiting
  • Cabrini Health

    Melbourne, Victoria, 3144

    Dr. Prachi Bhave, +61395083437

    Dr. Prachi Bhave

    Recruiting
  • Linear Clinical Research

    Nedlands, Western Australia, 6009

    Dr Timothy Humphries, +61863825100

    Dr Timothy Humphries

    Recruiting
  • Scientia Clinical Research Ltd

    Randwick, New South Wales, 2031

    Dr Charlotte Lemech, contactus@scientiaclinicalresearch.org.au

    Dr Charlotte Lemech

    Recruiting
  • Icon Cancer Centre South Brisbane

    South Brisbane, Queensland, 4101

    A/Prof Jermaine Coward, +61737374500

    A/Prof Jermaine Coward

    Recruiting
  • Calvary Mater Newcastle

    Waratah, New South Wales, 2298

    Kerrie Cornall, +61240143282

    Dr Jordan Cohen

    Recruiting

Other trials in Australia

About this study

Official title: A Phase 1, Open-Label, First-in-Human, Dose Escalation Study to Investigate the Safety, Pharmacokinetics, Pharmacodynamics and Preliminary Efficacy of MT-304 in Adults With Advanced HER2-Expressing Solid Tumors

This clinical trial is designed to evaluate the safety, pharmacokinetics, pharmacodynamics, and preliminary efficacy of MT-304 in adults with advanced HER2-expressing solid tumors. The main questions it aims to answer are:

  • What is the safety profile of MT-304 when administered alone or with nivolumab?
  • What is the recommended Phase 2 dose (RP2D) of MT-304?

Participants will:

  • Receive MT-304 alone (every 14 days) or with nivolumab (every 28 days).
  • Attend regular clinic visits for assessments and monitoring.
  • Continue treatment until disease progression, unacceptable toxicity, or study discontinuation.
Read the detailed description

This multicenter, open-label, Phase 1 trial is designed to assess the safety, tolerability, pharmacokinetics (PK), pharmacodynamics (PD), and preliminary efficacy of MT-304 in adults aged 18 and older with advanced HER2-expressing solid tumors.

The study consists of two treatment modules:

  • Module 1 (Monotherapy): Participants receive MT-304 every 14 days for 28-day cycles, with dosing adjustments based on clinical benefit and safety evaluations.
  • Module 2 (Combination Therapy): Participants receive MT-304 in combination with nivolumab, administered every 14 days and 28 days, respectively, also allowing for dosing adjustments.

The Bayesian Optimal Interval (BOIN) design will guide dose escalation, overseen by a Safety Review Committee to establish the recommended Phase 2 dose (RP2D).

Regular assessments, including vital signs and laboratory tests, will monitor safety and efficacy throughout the trial, with follow-up visits for up to 2 years post-treatment.

Being tested
MT-304, MT-304 + Nivolumab
Keywords
Anti-HER2 chimeric antigen receptor, Chimeric Antigen Receptor (CAR), mRNA, Lipid nanoparticle (LNP), Urothelial carcinoma, Endometrial carcinoma, Ovarian epithelial carcinoma, Breast carcinoma (all subtypes), Gastric adenocarcinoma, Esophageal adenocarcinoma, Non-small cell lung cancer, Colorectal carcinoma, Biliary cancer (including Gallbladder carcinoma and extrahepatic cholangiocarcinoma)
Medical subject headings
Carcinoma, Transitional Cell, Endometrial Neoplasms, Carcinoma, Ovarian Epithelial, Breast Neoplasms, Adenocarcinoma Of Esophagus, Carcinoma, Non-Small-Cell Lung, Colorectal Neoplasms, Biliary Tract Neoplasms

What participants receive

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

  • MT-304Drug

    Also called mRNA-LNP

    Safety, tolerability, and pharmacokinetics will be evaluated.

  • MT-304 + NivolumabDrug

    Also called mRNA-LNP

    Combination therapy begins after monotherapy dose clearance by the Safety Review Committee.

Study groups in NCT07334119
Study groupRoleWhat they receive
MT-304 MonotherapyExperimentalParticipants receive MT-304 administered intravenously once every 14 days (Q14D) in escalating dose levels.
Receives: Drug: MT-304
MT-304 + Nivolumab Combination TherapyExperimentalParticipants receive MT-304 administered intravenously once every 14 days (Q14D) in combination with nivolumab as "per local label" administered once every 28 days (Q28D).
Receives: Drug: MT-304 + Nivolumab

What is being measured

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

  1. Type, incidence and severity of Adverse Events

    Safety and tolerability profile assessed by the Common Terminology Criteria for Adverse Events v5.

    Measured: Up to 90 days from the last dose of Investigational Medicinal Product (IMP)

  2. Number of Participants With Change From Baseline in Vital Signs (Composite Safety Outcome)

    Body temperature, body weight, pulse rate, and blood pressure (systolic and diastolic) assessed collectively; participants with clinically significant changes in any vital sign parameter will be summarized as a composite safety outcome.

    Measured: Up to 30 days from the last dose of IMP

  3. Number of Participants With Abnormal Clinical Laboratory Parameters (Composite Safety Outcome)

    Hematology, clinical chemistry, coagulation, virology testing, and urinalysis assessed collectively; participants with abnormalities in any laboratory parameter will be summarized as a composite safety outcome.

    Measured: Up to 30 days from the last dose of IMP

  4. Number of Participants With Change From Baseline in ECG Parameters (Composite Safety Outcome)

    PR interval, QRS duration, QT interval, corrected QT interval (QTc), and heart rate assessed collectively from 12-lead ECG recordings; participants with clinically significant changes in any ECG parameter will be summarized as a composite safety outcome.

    Measured: Screening through Day 28, with assessments performed on Screening, Day 1 (pre-dose), and Day 28.

  5. Maximum Tolerated Dose (MTD)

    The MTD in Module 1 (monotherapy) will be determined based on dose-limiting toxicities (DLTs).

    Measured: 28 days from the last dose of IMP

  6. Optimal Biological Dose (OBD)

    The OBD in Module 2 (combination) will be identified based on dose-limiting toxicities (DLTs).

    Measured: 28 days from the last dose of IMP

Secondary outcomes (12)
  1. Pharmacokinetics (PK)

    PK Parameter: Maximum plasma concentration (Cmax)

    Measured: From Day 1, Day 2, Day 8, and Day 15 of Cycles 1 and 2, and Day 1 of Cycle 3 (each cycle is 28 days).

  2. Pharmacokinetics (PK)

    PK parameter: Area under Curve

    Measured: From Day 1, Day 2, Day 8, and Day 15 of Cycles 1 and 2, and Day 1 of Cycle 3 (each cycle is 28 days).

  3. Pharmacokinetics (PK)

    PK parameter: Time of maximum observed plasma concentration (tmax)

    Measured: From Day 1, Day 2, Day 8, and Day 15 of Cycles 1 and 2, and Day 1 of Cycle 3 (each cycle is 28 days).

  4. Pharmacokinetics (PK)

    PK parameter:Terminal half-life (t½)

    Measured: From Day 1, Day 2, Day 8, and Day 15 of Cycles 1 and 2, and Day 1 of Cycle 3 (each cycle is 28 days).

  5. Pharmacokinetics (PK)

    PK parameter: Plasma Clearance (CL)

    Measured: From Day 1, Day 2, Day 8, and Day 15 of Cycles 1 and 2, and Day 1 of Cycle 3 (each cycle is 28 days).

  6. Pharmacokinetics (PK)

    PK parameter: Volume of Distribution (Vd)

    Measured: From Day 1, Day 2, Day 8, and Day 15 of Cycles 1 and 2, and Day 1 of Cycle 3 (each cycle is 28 days).

  7. Pharmacokinetics (PK)

    PK parameter: Mean residence time (MRT)

    Measured: From Day 1, Day 2, Day 8, and Day 15 of Cycles 1 and 2, and Day 1 of Cycle 3 (each cycle is 28 days).

  8. To assess adverse events of special interest (AESI) by measuring infusion reaction

    Measured: Upto 90 days from the last dose of IMP

  9. To assess adverse events of special interest (AESI) by measuring cytokine release syndrome (CRS)

    Measured: Upto 90 days from the last dose of IMP

  10. To assess adverse events of special interest (AESI) by measuring immune effector cell-associated neurotoxicity syndrome (ICANS)

    Measured: Upto 90 days from the last dose of IMP

  11. To assess adverse events of special interest (AESI) by measuring hypersensitivity reaction

    Measured: Upto 90 days from the last dose of IMP

  12. To assess the incidence of second primary malignancies reported as adverse events of special interest (AESI) occurring during the study treatment period and long-term follow-up.

    Measured: From first dose of Investigational Medicinal Product (IMP) through end of study and follow-up (up to 2 years)

Timeline

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

  1. First posted12 Jan 2026
  2. Study start25 Nov 2025
  3. Primary completion31 Jan 2027 (estimated)
  4. Study completion30 Mar 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
Non-randomised
Intervention model
Sequential
Masking
None (open label)
Enrolment
60 participants (estimated)
IDs, dates and publications
ClinicalTrials.gov ID
NCT07334119
Sponsor's protocol ID
MTX-HER2-304
Status last verified
Oct 2025
First submitted
14 Nov 2025
Last updated
20 May 2026
Results posted
No
Data monitoring committee
No
FDA-regulated drug
No
FDA-regulated device
No
Individual data sharing
No

Questions about this trial

What is this clinical trial studying?

A Phase 1 study testing MT-304 and MT-304 + Nivolumab in people with HER2-Expressing Solid Tumors, run by Myeloid Therapeutics at 7 sites in Australia.

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 5 inclusion and 6 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 20 May 2026. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 7 sites in Australia. 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. 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 Project Manager (+61731376255, MTX-HER2-304_ClinicalStudy@novotech-cro.com), or a site near the patient. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

Type, incidence and severity of Adverse Events (time frame: Up to 90 days from the last dose of Investigational Medicinal Product (IMP)). The study lists 6 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 20 May 2026.

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