Phase 1 Open Label Trial of MST-0312 Alone and in Combination in Subjects With Solid Malignancies (STARLYS)

May 20, 2026 updated by: Mestag Therapeutics Limited

A Multi-arm, Open-label, Phase 1 Trial to Evaluate the Safety and Tolerability, Pharmacokinetics and Anti-tumour Activity of MST-0312 When Given Alone and in Combination With Anticancer Treatments in Subjects With Solid Malignancies

The STARLYS trial is an adaptive, modular, Phase 1, open-label, multi-part, clinical trial evaluating MST-0312 in selected solid tumors. MST-0312 is a targeted bispecific antibody that is designed to locally stimulate the lymphotoxin beta receptor (LTBR) in order to boost the body's immune response to cancer. The LTBR pathway is important in forming tertiary lymphoid structures and high endothelial venules in tumors, which have been associated with improved patient outcomes. The purpose of this study is to determine the safety and tolerability, pharmacodynamics, pharmacokinetics and anti-tumor activity of MST-0312 in subjects with solid malignancies (initially non-small cell lung cancer (NSCLC), melanoma, bladder cancer, colorectal cancer (CRC) and triple negative breast cancer (TNBC)) when administered either as monotherapy or in combination with anti-cancer treatments (initially pembrolizumab). The STARLYS trial is the first time MST-0312 has been administered to humans.

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Recruiting

Conditions

Conditions

The disease, disorder, syndrome, illness, or injury that is being studied. On ClinicalTrials.gov, conditions may also include other health-related issues, such as lifespan, quality of life, and health risks.

Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.

Study Type

Study Type

Describes the nature of a clinical study. Study types include interventional studies (also called clinical trials), observational studies (including patient registries), and expanded access.
Interventional

Enrollment (Estimated)

Enrollment

The number of participants in a clinical study. The "anticipated" enrollment is the target number of participants that the researchers need for the study.
157

Phase

Phase

The stage of a clinical trial studying a drug or biological product, based on definitions developed by the U.S. Food and Drug Administration (FDA). The phase is based on the study's objective, the number of participants, and other characteristics. There are five phases: Early Phase 1 (formerly listed as Phase 0), Phase 1, Phase 2, Phase 3, and Phase 4. Not Applicable is used to describe trials without FDA-defined phases, including trials of devices or behavioral interventions.
  • Phase 1

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

Study Contact

The name and contact information for the person who can answer enrollment questions for a clinical study. Each location where the study is being conducted may also have a specific contact, who may be better able to answer those questions.

Study Locations

  • Spain
      • Barcelona, Spain, 08035
        • Not yet recruiting
        • Hospital Universitari Vall d'Hebron
      • Madrid, Spain, 28027
        • Not yet recruiting
        • Clinica Universidad de Navarra
      • Madrid, Spain, 28040
        • Recruiting
        • Hospital Universitario Fundación Jimenez Díaz
      • Madrid, Spain, 28041
        • Not yet recruiting
        • Hospital Universitario 12 de Octubre
      • Madrid, Spain, 28050
        • Recruiting
        • Hospital Universitario HM Sanchinarro
      • Valencia, Spain, 46010
        • Not yet recruiting
        • Hospital Clinico Universitario de Valencia

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Eligibility Criteria

The key requirements that people who want to participate in a clinical study must meet or the characteristics they must have. Eligibility criteria consist of both inclusion criteria (which are required for a person to participate in the study) and exclusion criteria (which prevent a person from participating). Types of eligibility criteria include whether a study accepts healthy volunteers, has age or age group requirements, or is limited by sex.

Ages Eligible for Study

  • Adult
  • Older Adult

Accepts Healthy Volunteers

No

Description

Inclusion Criteria:

  • Male and female subjects of any ethnic origin, aged 18 years and over.
  • Must have given written informed consent and must be able to understand the full nature and purpose of the trial, including possible risks and adverse effects.
  • Subject must have a solid malignancy (non-small cell lung cancer (NSCLC), melanoma, bladder cancer, colorectal cancer (CRC) and triple negative breast cancer (TNBC)).
  • An ECOG performance status of 0 or 1 with no deterioration over the previous two weeks.
  • Willing to permit access to stored historical tumour tissue and prior tumour radiological assessments, cancer treatment history, including response to treatment, and tumour biomarker data, where available.
  • Willing and able to comply with all scheduled visits, treatment plans, laboratory tests, and other trial procedures.

Exclusion Criteria:

  • Any unresolved toxicity (except alopecia) from prior therapy of ≥2 CTCAE Grade.
  • Active or documented history of autoimmune disease requiring interventional therapy.
  • Active infection requiring systemic antibiotic, antifungal, or antiviral medication within 14 days prior to first dose of IMP.
  • Male or female subjects of childbearing potential unwilling to comply with contraception requirements.

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: Non-Randomized
  • Interventional Model: Parallel Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm

Participant Group / Arm

A group or subgroup of participants in a clinical trial that receives a specific intervention/treatment, or no intervention, according to the trial's protocol.
Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.
Experimental: Module 1A
MST-0312 monotherapy dose escalation
Drug: MST-0312
A complete treatment cycle is defined as 21 calendar days.
Experimental: Module 1B
MST-0312 monotherapy backfill
Drug: MST-0312
A complete treatment cycle is defined as 21 calendar days.
Experimental: Module 2A
MST-0312 plus pembrolizumab dose escalation
Drug: MST-0312
A complete treatment cycle is defined as 21 calendar days.
Drug: Pembrolizumab
Monoclonal antibody
Other Names:
  • Keytruda
Experimental: Module 2B
MST-0312 plus pembrolizumab backfill
Drug: MST-0312
A complete treatment cycle is defined as 21 calendar days.
Drug: Pembrolizumab
Monoclonal antibody
Other Names:
  • Keytruda
Experimental: Module 2C
MST-0312 plus pembrolizumab expansion
Drug: MST-0312
A complete treatment cycle is defined as 21 calendar days.
Drug: Pembrolizumab
Monoclonal antibody
Other Names:
  • Keytruda

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Time Frame
Incidence of Dose-limiting Toxicities (DLTs)
Time Frame: From baseline to end cycle 1. A complete treatment cycle is defined as 21 calendar days.
From baseline to end cycle 1. A complete treatment cycle is defined as 21 calendar days.
Incidence of Adverse Events, Treatment Emergent Adverse Events, Serious Adverse Events measured by Criteria for Adverse Events Version 6.0 (CTCAE v6.0)
Time Frame: Up to 24 months
Up to 24 months

Secondary Outcome Measures

Secondary Outcome Measures

In a clinical study's protocol, a planned outcome measure that is not as important as the primary outcome measure for evaluating the effect of an intervention but is still of interest. Most clinical studies have more than one secondary outcome measure.
Outcome Measure
Time Frame
Maximum Concentration (Cmax) Derived for MST-0312
Time Frame: 24 months
24 months
Time of Maximum Concentration (Tmax)
Time Frame: 24 Months
24 Months
Area Under the Curve (AUC) for Various Time Intervals
Time Frame: 24 Months
24 Months
Half Life (t1/2) for MST-0312
Time Frame: 24 Months
24 Months
Clearance (CL) for MST-0312
Time Frame: 24 Months
24 Months
Percentage of Participants with Anti-Drug Antibodies (ADAs)
Time Frame: 24 Months
24 Months
Objective Response Rate (ORR) by RECIST 1.1 and iRECIST
Time Frame: 12 Months
12 Months
Disease Control Rate (DCR) by RECIST 1.1 and iRECIST
Time Frame: 12 Months
12 Months
Duration of Response (DoR) by RECIST 1.1 and iRECIST
Time Frame: 12 Months
12 Months
Progression Free Survival (PFS) by RECIST 1.1 and iRECIST
Time Frame: 12 Months
12 Months
Best Overall Response (BoR) by RECIST 1.1 and iRECIST
Time Frame: 12 Months
12 Months
Time To Response (TTR) by RECIST 1.1 and iRECIST
Time Frame: 12 Months
12 Months
Progression Free Survival 2 (PFS2) by RECIST 1.1 and iRECIST
Time Frame: 48 Months
48 Months
Overall Survival (OS)
Time Frame: 48 Months
48 Months

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
Mestag Therapeutics Limited

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
April 9, 2026

Primary Completion (Estimated)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
December 31, 2029

Study Completion (Estimated)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
December 31, 2029

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
May 14, 2026

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
May 20, 2026

First Posted (Actual)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
May 28, 2026

Study Record Updates

Last Update Posted (Actual)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
May 28, 2026

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
May 20, 2026

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
May 1, 2026

More Information

Terms related to this study

Additional Relevant MeSH Terms

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • MST-0312-1001
  • 2025-524446-10 (EudraCT Number)

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

NO

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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Sponsors and Collaborators

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Drug Interventions

Conditions

Rare Diseases

Drug Interventions

Dietary Supplements

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Locations

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