Tucatinib Continuation Study

August 27, 2026 updated by: Pfizer

TUCATINIB CONTINUATION PROTOCOL: AN OPEN-LABEL STUDY FOR PARTICIPANTS FROM TUCATINIB CLINICAL STUDIES

The purpose of this protocol is to give continued access to tucatinib eligible participants. It also enables ongoing safety follow-up for those who continue to benefit from the study treatment. These participants were part of Pfizer-sponsored tucatinib parent studies that will be closed. Additional follow-up safety information will be collected. This will allow further understanding of the safety profile of tucatinib in participants who continue to receive the study treatment.

Study Overview

Status

Not yet recruiting

Conditions

Intervention / Treatment

Detailed Description

The study is seeking participants who

  • continue to benefit without disease progression from tucatinib as judged by the treating physician.
  • are willing to follow protocol requirements. All participants in this study will receive tucatinib. Tucatinib will be taken by mouth 2 times a day. We will examine the experiences of people receiving the study medicine. This will help us assess if tucatinib is safe.

Participants will stay in the study for up to 5 years or until tucatinib is permanently discontinued, whichever comes first. During this time, they will have one clinical visit every three weeks to receive the study treatment. They will also talk with the treating physician about their experiences.

Study Type

Interventional

Enrollment (Estimated)

175

Phase

  • Phase 4

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

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

Ages Eligible for Study

  • Adult
  • Older Adult

Accepts Healthy Volunteers

No

Description

Inclusion Criteria:

  1. Be receiving tucatinib as a study intervention and deriving clinical benefit without evidence of disease progression (as determined by the investigator) in a tucatinib Parent Study.
  2. Agree to follow the reproductive criteria.
  3. Be willing and able to comply with all scheduled visits, treatment plan, and other study procedures as outlined in this protocol.
  4. Be capable of giving signed informed consent.

Exclusion Criteria:

  1. Any medical reason that, in the opinion of the investigator or sponsor, precludes the participant from inclusion in the study.
  2. Current use of any prohibited concomitant medications(s) or unwillingness or inability to use a required concomitant medication(s).
  3. Participants not previously enrolled or who have discontinued study intervention or who were randomized in the control arm in a Parent Study.

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: N/A
  • Interventional Model: Single Group Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Experimental: tucatinib
150 - 300 mg, by mouth, twice a day
Drug: tucatinib
150 - 300 mg, by mouth, twice a day
Other Names:
  • TUKYSA

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
To monitor the safety and tolerability of tucatinib
Time Frame: Up to approximately 5 years
  • Adverse events leading to permanent discontinuation of tucatinib
  • All serious adverse events
Up to approximately 5 years

Collaborators and Investigators

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

Sponsor

Pfizer

Investigators

  • Study Director: Pfizer CT.gov Call Center, Pfizer

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.

Helpful Links

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 (Estimated)

November 6, 2026

Primary Completion (Estimated)

March 13, 2032

Study Completion (Estimated)

March 13, 2032

Study Registration Dates

First Submitted

August 12, 2026

First Submitted That Met QC Criteria

August 12, 2026

First Posted (Actual)

August 17, 2026

Study Record Updates

Last Update Posted (Actual)

August 28, 2026

Last Update Submitted That Met QC Criteria

August 27, 2026

Last Verified

August 1, 2026

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • C4251014
  • 2025 (U.S. NIH Grant/Contract: Faculty of Social Sciences Scientific Grant at the University of Gdańsk)
  • 2025-524353-14-00 (Registry Identifier: CTIS (EU))

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

NO

IPD Plan Description

Pfizer will provide access to individual de-identified participant data and related study documents (e.g. protocol, Statistical Analysis Plan (SAP), Clinical Study Report (CSR)) upon request from qualified researchers, and subject to certain criteria, conditions, and exceptions. Further details on Pfizer's data sharing criteria and process for requesting access can be found at: https://www.pfizer.com/science/clinical_trials/trial_data_and_results/data_requests.

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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