A Safety and Efficacy Study of ZW25 (Zanidatamab) Plus Combination Chemotherapy in HER2-expressing Gastrointestinal Cancers, Including Gastroesophageal Adenocarcinoma, Biliary Tract Cancer, and Colorectal Cancer

September 10, 2025 updated by: Jazz Pharmaceuticals

Phase 2 Study of ZW25 Plus First-line Combination Chemotherapy in HER2-Expressing Gastrointestinal (GI) Cancers, Including Gastroesophageal Adenocarcinoma (GEA), Biliary Tract Cancer (BTC), and Colorectal Cancer (CRC)

This is a multicenter, global, Phase 2, open-label, 2-part, first-line study to investigate the safety, tolerability, and anti-tumor activity of ZW25 (zanidatamab) plus standard first-line combination chemotherapy regimens for selected gastrointestinal (GI) cancers. Eligible patients include those with unresectable, locally advanced, recurrent or metastatic HER2-expressing gastroesophageal adenocarcinoma (GEA), biliary tract cancer (BTC), or colorectal cancer (CRC).

Study Overview

Status

Status

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

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

Part 1 of the study will first evaluate the safety and tolerability of ZW25 plus standard first-line combination chemotherapy (XELOX, FP, or mFOLFOX6 for GEA; mFOLFOX6 with or without bevacizumab for CRC; and CisGem for BTC) and will confirm the recommended dosage (RD) of ZW25 when administered in combination with each of these multi-agent chemotherapy regimens. Then, Part 2 of the study will evaluate the anti-tumor activity of ZW25 plus combination chemotherapy in HER2-expressing GEA, BTC, and CRC.

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 (Actual)

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.
74

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

Expanded Access

Expanded Access

A way for patients with serious diseases or conditions who cannot participate in a clinical trial to gain access to a medical product that has not been approved by the U.S. Food and Drug Administration (FDA). Also called compassionate use. There are different expanded access types.
No longer available

No longer available

  • Available: Expanded access is currently available for this investigational treatment, and patients who are not participants in the clinical study may be able to gain access to the drug, biologic, or medical device being studied.
  • No longer available: Expanded access was available for this intervention previously but is not currently available and will not be available in the future.
  • Temporarily not available: Expanded access is not currently available for this intervention but is expected to be available in the future.
  • Approved for marketing: The intervention has been approved by the U.S. Food and Drug Administration for use by the public.
 outside the clinical trial. See expanded access record.

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

  • Canada
    • Ontario
      • Ottawa, Ontario, Canada, K1H 8L6
        • The Ottawa Hospital Cancer Centre
      • Toronto, Ontario, Canada, M5G 2C1
        • Princess Margaret Cancer Center
  • Chile
      • Santiago, Chile, 8241479
        • Icegclinic Research & Care
      • Santiago, Chile, 8420383
        • Centro Internacional de Estudios Clínicos
      • Santiago, Chile, 7500653
        • Centro de Investigacion Clinica SAGA
      • Santiago, Chile, 8320000
        • CeCim Biocinetic
  • South Korea
      • Busan, South Korea, 49241
        • Pusan National University
      • Seoul, South Korea, 03080
        • Seoul National University Hospital
      • Seoul, South Korea, 05505
        • Asan Medical Center
      • Seoul, South Korea, 03722
        • Severance Hospital
      • Seoul, South Korea, 02841
        • Korea University Anam Hospital
    • Gyeonggi-do
      • Seongnam-si, Gyeonggi-do, South Korea, 13620
        • Seoul National University Bundang Hospital
  • United States
    • California
      • Los Angeles, California, United States, 90033
        • USC/Norris Comprehensive Cancer Center
      • Newport Beach, California, United States, 92663
        • Hoag Memorial Hospital Presbyterian
    • Florida
      • Tampa, Florida, United States, 33612
        • H. Lee Moffitt Cancer Center
    • Illinois
      • Chicago, Illinois, United States, 60637
        • University of Chicago
    • Michigan
      • Grand Rapids, Michigan, United States, 49503
        • The Cancer and Hematology Centers
    • Nebraska
      • Omaha, Nebraska, United States, 68114
        • Nebraska Methodist Hospital
    • New York
      • New York, New York, United States, 10065
        • Memorial Sloan Kettering Cancer Center
    • Pennsylvania
      • Philadelphia, Pennsylvania, United States, 19111
        • Fox Chase Cancer Center
    • Tennessee
      • Nashville, Tennessee, United States, 37203
        • Sarah Cannon Research Institute
    • Texas
      • Houston, Texas, United States, 77030
        • MD Anderson Cancer Center
    • Washington
      • Seattle, Washington, United States, 98101
        • Virginia Mason Medical 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

18 years and older (Adult, Older Adult)

Accepts Healthy Volunteers

No

Description

Inclusion:

  • Disease diagnosis:

    • Part 1:
    • GEA: Unresectable, locally advanced, recurrent or metastatic HER2-expressing GEA (IHC 3+ or 2+ with or without gene amplification based upon local assessment or central assessment)
    • BTC: Unresectable, locally advanced, recurrent or metastatic HER2-expressing BTC (including intrahepatic cholangiocarcinoma [ICC], extrahepatic cholangiocarcinoma [ECC], or gallbladder cancer [GBC]) (IHC 3+ with or without gene amplification; or IHC 0, 1+ or 2+ with gene amplification, based upon central assessment)
    • CRC: Unresectable, locally advanced, recurrent or metastatic HER2-expressing CRC (IHC 3+ with or without gene amplification; or IHC 0, 1+ or 2+ with gene amplification, based upon central assessment). Patients will be required to be extended RAS (KRAS and NRAS) and BRAF wild-type based upon central assessment.
    • Part 2:
    • GEA: Unresectable, locally advanced, recurrent or metastatic HER2-expressing GEA (IHC 3+, or IHC 2+ and FISH+ by central assessment)
    • BTC: Same as Part 1
    • CRC: Same as Part 1

  • Tumor measurements as per Response Evaluation Criteria in Solid Tumors (RECIST) version 1.1:

    • Part 1: Measurable or non-measurable disease
    • Part 2: Measurable disease
  • An Eastern Cooperative Oncology Group (ECOG) Performance Status score of 0 or 1
  • Adequate organ function
  • Adequate cardiac left ventricular function, as defined by a LVEF >/= institutional standard of normal

Exclusion:

  • Prior treatment with a HER2-targeted agent

  • Prior systemic anti-cancer therapy (including investigational products) except prior adjuvant/neoadjuvant therapy, which must be completed at least 6 months prior to first study treatment dosing. For subjects with BTC and CRC the following additional exceptions apply:

    • BTC: patients may have started therapy for advanced disease but may not have received more than one cycle of any standard gemcitabine-based chemotherapy regimen.
    • CRC: patients may have started therapy for advanced disease but may not have received more than one cycle of 5-FU-based chemotherapy (< 1 month of therapy).
  • Patients with certain contraindications to bevacizumab cannot be enrolled on the mFOLFOX6-2 with bevacizumab arm.
  • Palliative radiotherapy is allowed if completed at least 2 weeks prior to first study treatment dosing
  • Untreated known brain metastases (patients with treated brain metastases who are off steroids, off antiseizure medications, and stable for at least 1 month at the time of screening are eligible)
  • Clinically significant cardiac disease, such as ventricular arrhythmia requiring therapy, uncontrolled hypertension or any history of symptomatic congestive heart failure (CHF). Patients with known myocardial infarction or unstable angina within 6 months prior to randomization are also excluded.
  • QTc Fridericia (QTcF) > 470 ms. For patients with longer QTcF on initial electrocardiogram (ECG), follow-up ECG may be performed in triplicate to determine eligibility
  • Peripheral neuropathy > Grade 1 per NCI-CTCAE v5.0
  • Clinically significant interstitial lung disease
  • Prior or concurrent malignancy whose natural history or treatment has the potential to interfere with the safety or efficacy assessment of the investigational regimen
  • Active hepatitis B or hepatitis C infection or infection with Human Immunodeficiency Virus (HIV)-1 or HIV-2 (Exception: patients with well controlled HIV [e.g., CD4 > 350/mm3 and undetectable viral load] are eligible)

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: ZW25 + FP
ZW25 plus fluorouracil (5-FU) and cisplatin
Drug: Cisplatin
Administered IV
Drug: Fluorouracil
Administered IV
Drug: ZW25 (Zanidatamab)
  • Part 1: administered IV at dose levels and schedules determined by the Safety Monitoring Committee (SMC)
  • Part 2: RD identified in Part 1
Experimental: ZW25 + mFOLFOX6
ZW25 plus 5-FU, leucovorin, and oxaliplatin
Drug: Fluorouracil
Administered IV
Drug: Oxaliplatin
Administered IV
Drug: ZW25 (Zanidatamab)
  • Part 1: administered IV at dose levels and schedules determined by the Safety Monitoring Committee (SMC)
  • Part 2: RD identified in Part 1
Drug: Leucovorin
Administered IV
Experimental: ZW25 + XELOX
ZW25 plus capecitabine and oxaliplatin
Drug: Oxaliplatin
Administered IV
Drug: ZW25 (Zanidatamab)
  • Part 1: administered IV at dose levels and schedules determined by the Safety Monitoring Committee (SMC)
  • Part 2: RD identified in Part 1
Drug: Capecitabine
Administered orally twice daily (PO bid)
Experimental: ZW25 + mFOLFOX6 with bevacizumab
ZW25 plus 5-FU, leucovorin, oxaliplatin, and bevacizumab
Drug: Fluorouracil
Administered IV
Drug: Oxaliplatin
Administered IV
Drug: ZW25 (Zanidatamab)
  • Part 1: administered IV at dose levels and schedules determined by the Safety Monitoring Committee (SMC)
  • Part 2: RD identified in Part 1
Drug: Leucovorin
Administered IV
Drug: Bevacizumab
Administered IV
Experimental: ZW25 + CisGem
ZW25 plus cisplatin and gemcitabine
Drug: Cisplatin
Administered IV
Drug: Gemcitabine
Administered IV

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
Incidence of dose-limiting toxicities (DLTs) (Part 1)
Time Frame: Up to 6 weeks
Number of participants who experienced a DLT. DLTs include adverse events considered to be related to study treatment, including the evaluated dose level of ZW25, any component or combination of the components of a chemotherapy regimen, or the combination of ZW25 plus a chemotherapy regimen.
Up to 6 weeks
Incidence of adverse events (Part 1)
Time Frame: Up to 11 months
Number of participants who experienced an adverse event
Up to 11 months
Incidence of lab abnormalities (Part 1)
Time Frame: Up to 11 months
Number of participants who experienced a maximum severity of Grade 3 or higher post-baseline laboratory abnormality, including either hematology and chemistry. Grades are defined using National Cancer Institute's Common Terminology Criteria for Adverse Events (CTCAE), version 5.0.
Up to 11 months
Objective response rate (ORR) (Part 2)
Time Frame: Up to 10 months
Number of participants who achieved a best response of either complete response (CR) or partial response (PR) during treatment according to the Response Evaluation Criteria in Solid Tumors (RECIST) version 1.1
Up to 10 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
Objective response rate (ORR) (Part 1)
Time Frame: Up to 10 months
Number of participants who achieved a best response of either CR or PR during treatment per RECIST 1.1
Up to 10 months
Disease control rate (Parts 1 and 2)
Time Frame: Up to 10 months
Number of participants who achieved a best response of CR, PR, or stable disease (SD) during treatment per RECIST 1.1
Up to 10 months
Duration of response (Parts 1 and 2)
Time Frame: Up to 2 years
Median duration of response (in months) and range (minimum, maximum)
Up to 2 years
Clinical benefit rate (Parts 1 and 2)
Time Frame: Up to 2 years
Number of participants with SD for ≥ 24 weeks or a confirmed, best overall response of CR or PR per RECIST 1.1
Up to 2 years
Progression-free survival (Parts 1 and 2)
Time Frame: Up to 2 years
Median progression-free survival (in months) and range (minimum, maximum)
Up to 2 years
Overall survival (Parts 1 and 2)
Time Frame: Up to 2 years
Median overall survival (in months) and range (minimum, maximum)
Up to 2 years
Incidence of anti-drug antibodies (ADAs) (Parts 1 and 2)
Time Frame: Up to 11 months
Number of participants who develop ADAs
Up to 11 months
End of infusion concentration of ZW25 (Parts 1 and 2)
Time Frame: Up to 11 months
Up to 11 months
Maximum serum concentration of ZW25 (Parts 1 and 2)
Time Frame: Up to 11 months
Up to 11 months
Trough concentration of ZW25 (Parts 1 and 2)
Time Frame: Up to 11 months
Up to 11 months
Incidence of adverse events (Part 2)
Time Frame: Up to 11 months
Number of participants who experienced an adverse event
Up to 11 months
Incidence of lab abnormalities (Part 2)
Time Frame: Up to 11 months
Number of participants who experienced a maximum severity of Grade 3 or higher post-baseline laboratory abnormality, including either hematology and chemistry. Grades are defined using National Cancer Institute's CTCAE, version 5.0.
Up to 11 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.
Jazz Pharmaceuticals

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: Phillip Garfin, MD, PhD, Jazz Pharmaceuticals

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

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.
August 29, 2019

Primary Completion (Actual)

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.
August 30, 2025

Study Completion (Actual)

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.
August 30, 2025

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).
February 22, 2019

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.
April 23, 2019

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.
April 29, 2019

Study Record Updates

Last Update Posted (Estimated)

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.
September 12, 2025

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.
September 10, 2025

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.
September 1, 2025

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.
  • ZWI-ZW25-201

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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