Basket Study of Tucatinib and Trastuzumab in Solid Tumors With HER2 Alterations

  • End date
    May 31, 2025
  • participants needed
  • sponsor
    Seagen Inc.
Updated on 27 July 2022
systemic therapy
measurable disease
breast cancer
endocrine therapy
hormone therapy
cancer chemotherapy
targeted therapy
metastatic cervical cancer


This trial studies how well tucatinib works for solid tumors that make either more HER2 or a different type of HER2 than usual (HER2 alterations) The solid tumors studied in this trial have either spread to other parts of the body (metastatic) or cannot be removed completely with surgery (unresectable).

All participants will get both tucatinib and trastuzumab. People with hormone-receptor positive breast cancer will also get a drug called fulvestrant.

The trial will also look at what side effects happen. A side effect is anything a drug does besides treating cancer.


There are multiple cohorts in this trial:

  • 5 tumor specific cohorts with HER2 overexpression/amplification (cervical cancer, uterine cancer, biliary tract cancer, urothelial cancer, and non-squamous non-small cell lung cancer [NSCLC])
  • 2 tumor specific cohorts with HER2 mutations (non-squamous NSCLC and breast cancer)
  • 2 cohorts which will enroll all other HER2 amplified/overexpressed solid tumor types (except breast cancer, gastric or gastroesophageal junction adenocarcinoma [GEC], and colorectal cancer [CRC]) or HER2-mutated solid tumor types.

Condition Uterine Neoplasms, Uterine Cervical Neoplasms, Biliary Tract Neoplasms, Urologic Neoplasms, Carcinoma, Non-Small-Cell Lung, HER2 Mutations Breast Neoplasms
Treatment Trastuzumab, fulvestrant, Tucatinib
Clinical Study IdentifierNCT04579380
SponsorSeagen Inc.
Last Modified on27 July 2022


Yes No Not Sure

Inclusion Criteria

Histologically or cytologically confirmed diagnosis of locally-advanced unresectable or metastatic solid tumor, including primary brain tumors
Participants with non-squamous NSCLC must have progressed during or after standard treatment or for which no standard treatment is available
Participants with other disease types must have progressed during or after ≥1 prior line of systemic therapy for locally-advanced unresectable or metastatic disease
Disease progression during or after, or intolerance of, the most recent line of systemic therapy
Disease demonstrating HER2 alterations (overexpression/amplification or HER2 activating mutations), as determined by local or central testing processed in a Clinical Laboratory Improvement Amendments (CLIA)- or International Organization for Standardization (ISO) accredited laboratory, according to one of the following
HER2 overexpression/amplification from fresh or archival tumor tissue or blood
Known activating HER2 mutations detected in fresh or archival tumor tissue or blood
Have measurable disease per RECIST v1.1 criteria according to investigator assessment
Have Eastern Cooperative Oncology Group (ECOG) performance status 0 or 1

Exclusion Criteria

Participants with breast cancer, gastric or gastroesophageal junction adenocarcinoma, or CRC whose disease shows HER2 amplification/overexpression
Previous treatment with HER2-directed therapy; participants with uterine serous carcinoma or HER2-mutated gastric or gastroesophageal junction adenocarcinoma without HER2-overexpression/amplification may have received prior trastuzumab
History of exposure to a 360 mg/m² doxorubicin-equivalent or >720 mg/m^2 epirubicin-equivalent cumulative dose of anthracyclines
Treatment with any systemic anti-cancer therapy, radiation therapy, major surgery, or experimental agent within ≤3 weeks of first dose of study treatment or are currently participating in another interventional clinical trial
There are additional inclusion and exclusion criteria. The study center will determine if
criteria for participation are met
Known hypersensitivity to any component of the drug formulation of tucatinib or trastuzumab (drug substance, excipients, murine proteins), or any component of the drug formulation of fulvestrant in participants with HR+ HER2-mutated breast cancer
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How to participate?

Step 1 Connect with a study center
What happens next?
  • You can expect the study team to contact you via email or phone in the next few days.
  • Sign up as volunteer to help accelerate the development of new treatments and to get notified about similar trials.

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Additional screening procedures may be conducted by the study team before you can be confirmed eligible to participate.

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If you are confirmed eligible after full screening, you will be required to understand and sign the informed consent if you decide to enroll in the study. Once enrolled you may be asked to make scheduled visits over a period of time.

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Complete your scheduled study participation activities and then you are done. You may receive summary of study results if provided by the sponsor.

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