A Clinical Trial to Test if the Investigational Drug BNT329 is Safe and Potentially Beneficial for People With Advanced Solid Tumors Known to Express the Tumor Marker CA19-9

August 26, 2026 updated by: BioNTech SE

First-in-human, Open-label, Multi-site, Phase I/IIa, Dose Escalation Trial With Expansion Cohorts to Evaluate Safety and Preliminary Efficacy of BNT329 in Participants With Advanced Solid Tumors Known to Express CA19-9

The main goal of this study is to evaluate the safety of BNT329 and to identify the best dose of BNT329. This will be done by measuring the number of side effects that participants experience and how severe they are.

The second goal of this study is to evaluate how well BNT329 works. This will be done by measuring the number of participants who respond to the treatment. The length of time where the tumor does not grow or spread will also be measured.

The study will also evaluate how BNT329 moves into, through, and out of the body and how the treatment affects the body.

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.

Detailed Description

The study will consist of up to four parts (Parts A, B, C, and D).

Parts A and B will be a dose escalation to investigate the safety and tolerability of BNT329. Parts A and B will enroll participants with the following advanced solid tumors known to express carbohydrate antigen 19-9 (CA19-9): pancreatic ductal adenocarcinoma (PDAC) (the most common type of pancreatic cancer), bile duct cancer, a certain type of bladder cancer that started in the lining of the bladder or urinary tract (invasive urothelial carcinoma of the bladder and urinary tract), colorectal cancer, gastroesophageal junction cancer, gastric adenocarcinoma, endometrial cancer, or ovarian cancer. The cancer must not have responded well to previous treatments.

The study will start with recruitment into Part A. Part B (testing a more frequent dosing schedule) will only be opened if indicated by cumulative data from Part A of the study.

Part C (testing pre-dosing with a CA19-9 targeting monoclonal antibody prior to BNT329 administration) will only be opened in case of unforeseen safety and/or weak efficacy signals are detected in Part A and (if opened) Part B. Details on Part C will be added in a future update, if it is necessary, to open this part.

Part D will be a dose optimization and proof-of-concept study to further investigate the safety and tolerability of BNT329 and to investigate preliminary anti-tumor activity. Part D will enroll participants with second-line plus PDAC.

Parts A, B, and C will be non-randomized. In Part D, participants will be randomized (1:1) into one of two arms which will evaluate two dose levels (as selected from Parts A and B).

The study consists of a screening period, a treatment period, an end of treatment visit, two safety follow-up visits, and a survival follow-up period. The treatment period will last for a maximum of 2 years. Participants will remain in the survival follow-up until death, withdrawal of participant's consent, or termination of the study, whichever occurs first.

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.
245

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 2
  • 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.
  • Name: BioNTech clinical trials patient information
  • Phone Number: +49 6131 9084
  • Email: patients@biontech.de

Study Locations

  • Australia
      • Clayton, Australia, 3168
        • Recruiting
        • Monash Health
      • Heidelberg, Australia, 3084
        • Recruiting
        • Austin Health
  • Germany
      • Bochum, Germany, 44791
        • Recruiting
        • St. Josef-Hospital im Katholischen Klinikum Bochum
      • München, Germany, 81377
        • Recruiting
        • Klinikum der Universität München
      • Ulm, Germany, D-89081
        • Recruiting
        • Universitaetsklinikum Ulm
  • Spain
      • Barcelona, Spain, 08035
        • Recruiting
        • Hospital Universitari Vall d'Hebron
      • Logroño, Spain, 26006
        • Recruiting
        • Hospital San Pedro
      • Madrid, Spain, 28050
        • Recruiting
        • Hospital Universitario HM Sanchinarro - START Madrid CIOCC
      • Pozuelo de Alarcón, Spain, 28223
        • Recruiting
        • Hospital Universitario Quironsalud Madrid - NEXT Oncology
  • United Kingdom
      • Leeds, United Kingdom, LS9 7TF
        • Recruiting
        • St James´s University Hospital
      • London, United Kingdom, NW3 2QG
        • Recruiting
        • Royal Free Hospital
      • Manchester, United Kingdom, M20 4BX
        • Recruiting
        • The Christie NHS Foundation Trust
      • Newcastle upon Tyne, United Kingdom, NE7 7DN
        • Recruiting
        • Northern Centre for Cancer Research
      • Sutton, United Kingdom, SM2 5PT
        • Recruiting
        • The Royal Marsden Hospital
  • United States
    • Colorado
      • Denver, Colorado, United States, 80218
        • Recruiting
        • SCRI at HCA Health One
    • Florida
      • Orlando, Florida, United States, 32827
        • Recruiting
        • Florida Cancer Specialists
    • New York
      • New York, New York, United States, 10065
        • Recruiting
        • Memorial Sloan Kettering Cancer Center

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

Key Inclusion Criteria

All participants and parts:

  • Have an Eastern Cooperative Oncology Group performance score of 0 to 1
  • Have measurable disease per RECIST v1.1, except for ovarian cancer where participants will be evaluated according to Gynecologic Cancer InterGroup criteria.
  • Have a life expectancy of ≥3 months in the opinion of the investigator.
  • Have adequate organ, coagulation, and hematologic function as defined in the protocol.

Parts A, B, and C:

  • Have a histologically confirmed advanced/metastatic tumor type that is known to express CA19-9: PDAC, carcinoma of the bile ducts, invasive urothelial carcinoma of the bladder and urinary tract, colorectal adenocarcinoma, adenocarcinoma of the esophagogastric junction, gastric adenocarcinoma, endometrial carcinoma, and epithelial ovarian cancer (including adenocarcinoma of the fallopian tube and peritoneal epithelial cancer [except mesothelioma]).
  • Have no available standard of care therapy likely to confer clinical benefit in the opinion of the investigator. Participants must have received all available standard therapies, including targeted therapies based on mutation status (per guidelines from the Food and Drug Administration, American Society of Clinical Oncology, European Society for Medical Oncology, or local guidelines used at the site), and failed at least first-line standard of care therapy prior to enrollment.

Part D:

  • Have a histologically confirmed diagnosis of PDAC.
  • Must have been offered all available standard therapies including targeted therapies based on mutation status. Established second-line therapies available must not be withheld.
  • Have radiographic disease progression and no available standard of care therapy likely to confer clinical benefit in the opinion of the investigator.

Key Exclusion Criteria

All participants and parts:

  • Are enrolled in another investigational study or are subject to exclusion periods from another investigational study.
  • Have had an inadequate washout period for prior anticancer treatment prior to the first dose of investigational medicinal product (IMP) as defined in the protocol.

  • Have received systemic steroids (>10 mg/day of prednisone or its equivalent) or other immunosuppressive therapy within 2 weeks prior to the first dose of IMP. The following are exceptions to this criterion:

    • Inhaled sprays, topical steroids, or local steroid injections (e.g., intra-articular injection).
    • Systemic steroids at physiological doses as replacement therapy (e.g., physiological corticosteroid replacement therapy for adrenal or pituitary insufficiency).
    • Steroids as pre-medication for hypersensitivity reactions (e.g., computed tomography (CT) scan pre-medication).
  • Have received any live vaccine within 4 weeks prior to the first dose of IMP or intend to receive a live vaccine during the study.
  • Have brain metastases or spinal cord compression unless asymptomatic or treated and stable off steroids and anticonvulsants for at least 2 weeks prior to the first dose of IMP.
  • Have a history of (noninfectious) interstitial lung disease (ILD)/pneumonitis that required steroids, current ILD/pneumonitis, or where suspected ILD/pneumonitis cannot be ruled out by imaging at screening.
  • Have active gastric and duodenal ulcers, ulcerative colitis, or other gastrointestinal conditions that may cause bleeding or perforation in the opinion of the treating investigator.
  • Have an active infection that requires systemic therapy within 1 week prior to the first dose of IMP. Participants receiving prophylactic anti-infective therapy (e.g., to prevent a urinary tract infection or chronic obstructive pulmonary disease exacerbation) may be eligible after discussion with the sponsor.
  • Have unresolved toxicities from previous anticancer therapy as defined in the protocol.

NOTE: Other protocol defined inclusion/exclusion criteria apply.

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: Randomized
  • Interventional Model: Sequential 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: Dose Escalation - Part A
BNT329 administered once every 3 weeks at protocol-defined dose levels
Drug: BNT329
Intravenous (IV) infusion
Experimental: Dose Escalation - Part B
BNT329 administered once every 2 weeks at protocol-defined dose levels
Drug: BNT329
Intravenous (IV) infusion
Experimental: Dose Escalation: Part C
BNT329 administered after pre-dosing with a CA19-9 targeting monoclonal antibody
Drug: BNT329
Intravenous (IV) infusion
Drug: CA19-9-targeting monoclonal antibody
Monoclonal antibody
Experimental: Dose Expansion - Part D
Participants will be randomized to one of two arms evaluating two different doses as selected from Parts A, B, and/or C
Drug: BNT329
Intravenous (IV) infusion

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
Measure Description
Time Frame
Parts A and B - Occurrence of dose-limiting toxicities within a participant
Time Frame: First 21 days (Part A) or 28 days (Part B) after the first dose of BNT329.
Per dose level.
First 21 days (Part A) or 28 days (Part B) after the first dose of BNT329.
Parts A, B, and D - Occurrence of treatment-emergent adverse events (TEAEs), Grade ≥3 TEAEs, serious adverse events (SAEs), treatment-related TEAEs, treatment-related Grade ≥3 TEAEs, and treatment-related SAEs
Time Frame: From first dose of BNT329 until 60 days after the last dose of BNT329 (up to 26 months).
Per dose level.
From first dose of BNT329 until 60 days after the last dose of BNT329 (up to 26 months).
Parts A, B, and D - Occurrence of dose interruptions, reductions, and discontinuation of BNT329 due to TEAEs
Time Frame: From the time of initiation of the first dose of BNT329 until 60 days after the last dose of BNT329 (up to 26 months).
Per dose level.
From the time of initiation of the first dose of BNT329 until 60 days after the last dose of BNT329 (up to 26 months).
Part D - Objective response rate (ORR)
Time Frame: From first dose of BNT329 until end of study (up to approximately 36 months).
Per dose level. Defined as the proportion of participants in whom a confirmed complete response (CR) or partial response (PR) (based on the investigator's assessment) is observed as best overall response.
From first dose of BNT329 until end of study (up to approximately 36 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
Measure Description
Time Frame
Parts A, B, and D - Assessment of area under the curve derived from serum/plasma concentrations of CA19-9-unbound ADC, CA19-9-unbound total anti-CA19-9 antibody, and unconjugated YL0010014 payload
Time Frame: First 21 days (Part A) or 28 days (Part B) after the first dose of BNT329.
Per dose level (if data permit)
First 21 days (Part A) or 28 days (Part B) after the first dose of BNT329.
Parts A, B, and D - Assessment of maximum concentration derived from serum/plasma concentrations of CA19-9-unbound ADC, CA19-9-unbound total anti-CA19-9 antibody, and unconjugated YL0010014 payload
Time Frame: First 21 days (Part A) or 28 days (Part B) after the first dose of BNT329.
Per dose level (if data permit).
First 21 days (Part A) or 28 days (Part B) after the first dose of BNT329.
Parts A, B, and D - Assessment of time to reach maximum concentration derived from serum/plasma concentrations of CA19-9-unbound ADC, CA19-9-unbound total anti-CA19-9 antibody, and unconjugated YL0010014 payload
Time Frame: First 21 days (Part A) or 28 days (Part B) after the first dose of BNT329.
Per dose level (if data permit).
First 21 days (Part A) or 28 days (Part B) after the first dose of BNT329.
Parts A, B, and D - Assessment of terminal half-life derived from serum/plasma concentrations of CA19-9-unbound ADC, CA19-9-unbound total anti-CA19-9 antibody, and unconjugated YL0010014 payload
Time Frame: First 21 days (Part A) or 28 days (Part B) after the first dose of BNT329.
Per dose level (if data permit).
First 21 days (Part A) or 28 days (Part B) after the first dose of BNT329.
Parts A and B - ORR
Time Frame: From first dose of BNT329 until end of study (up to approximately 36 months).
Per dose level. Defined as the proportion of participants in whom a confirmed CR or PR (based on the investigator's assessment) is observed as best overall response.
From first dose of BNT329 until end of study (up to approximately 36 months).
Parts A, B, and D - Disease control rate
Time Frame: From first dose of BNT329 until end of study (up to approximately 36 months).
Per dose level. Defined as the proportion of participants in whom a CR or PR or stable disease (assessed at least 6 weeks [±2 days] after the first BNT329 dose) is observed as best overall response per investigator's assessment.
From first dose of BNT329 until end of study (up to approximately 36 months).
Parts A, B, and D - Duration of response
Time Frame: From first dose of BNT329 until end of study (up to approximately 36 months).
Per dose level. Defined as the time from first objective response (CR or PR) to first occurrence of objective tumor progression (PD) or death from any cause, whichever occurs first.
From first dose of BNT329 until end of study (up to approximately 36 months).
Parts A, B, and D - Progression free survival
Time Frame: From first dose of BNT329 until end of study (up to approximately 36 months).
Per dose level. Defined as the time from first dose of BNT329 to first objective tumor progression (PD per Response Evaluation Criteria in Solid Tumors version 1.1 [RECIST v1.1] based on the investigator's assessment), or death from any cause, whichever occurs first.
From first dose of BNT329 until end of study (up to approximately 36 months).
Part D - Overall survival
Time Frame: From first dose of BNT329 until end of study (up to approximately 36 months).
Per dose level. Defined as the time from first dose of BNT329 to death from any cause.
From first dose of BNT329 until end of study (up to approximately 36 months).
Parts A, B, and D: Anti-drug antibody (ADA) prevalence
Time Frame: From first dose of BNT329 until up to 60 days after the last dose of BNT329 (up to 26 months).
Per dose level/cohort. Defined as the proportion of participants who are ADA positive at any timepoint (either baseline or post-baseline) (if data permit).
From first dose of BNT329 until up to 60 days after the last dose of BNT329 (up to 26 months).
Parts A, B, and D - ADA incidence
Time Frame: From first dose of BNT329 until up to 60 days after the last dose of BNT329 (up to 26 months).
Per dose level/cohort. Defined as the proportion of participants having treatment-emergent ADA (if data permit).
From first dose of BNT329 until up to 60 days after the last dose of BNT329 (up to 26 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.
BioNTech SE

Investigators

Investigators

A researcher involved in a clinical study. Related terms include site principal investigator, site sub-investigator, study chair, study director, and study principal investigator.
  • Study Director: BioNTech Response Person, BioNTech SE

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.
November 18, 2025

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.
May 1, 2030

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.
May 1, 2030

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).
September 16, 2025

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.
September 16, 2025

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.
September 22, 2025

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.
August 27, 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.
August 26, 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.
August 1, 2026

More Information

Terms related to this study

Keywords

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.
  • BNT329-01
  • 2025 (U.S. NIH Grant/Contract: Faculty of Social Sciences Scientific Grant at the University of Gdańsk)
  • 2025-522613-26-00 (Ctis)
  • 1012877 (Other Identifier: United Kingdom (UK) integrated research application system (IRAS))

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

Yes

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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