CI

At a glance

ClinicalIndex Comparison Record
Phase 3Active· 466 enrolled
Drug / intervention
tucatinib +2 moredrug
Likely dose
tucatinib 300mgfrom record
Structured eligibility isn't available for this trial yet — see the full criteria in the Eligibility tab below.

Standardized by ClinicalIndex from the ClinicalTrials.gov record · verify against the source.

Search/NCT03975647
NCT03975647Phase 3Active

Randomized, Double-blind, Phase 3 Study of Tucatinib or Placebo in Combination With Ado-trastuzumab Emtansine (T-DM1) for Subjects With Unresectable Locally-advanced or Metastatic HER2+ Breast Cancer (HER2CLIMB-02)

Seagen, a wholly owned subsidiary of Pfizer·interventional·Posted Jun 5, 2019·Updated Mar 30, 2026

In Brief

A Phase 3 clinical trial evaluating tucatinib, placebo, and 1 other intervention for HER2-positive Breast Cancer. Active but no longer recruiting, targeting 466 participants across 486 sites in 20 countries.

Detailed Summary

This study is being done to see if tucatinib with ado-trastuzumab emtansine (T-DM1) works better than T-DM1 alone to help patients who have a specific type of breast cancer called HER2 positive breast carcinoma. The breast cancer in this study is either metastatic (spread into other parts of the body) or cannot be removed completely with surgery. Patients in this study will be randomly assigned to get either tucatinib or placebo (a pill with no medicine). This is a blinded study, so neither patients nor their doctors will know whether a patient gets tucatinib or placebo. All patients in the study will get T-DM1, a drug that is often used to treat this cancer. Each treatment cycle lasts 21 days. Patients will swallow tucatinib pills or placebo pills two times every day. Patients will get T-DM1 injections from the study site staff on the first day of every cycle.

Study Details

Study Typeinterventional
Allocation--
Masking--
Primary Purpose--
CountriesAustralia, Austria, Belgium, Canada, China, Denmark, France, Germany, Israel, Italy, Japan, Netherlands, Singapore, South Korea, Spain, Sweden, Switzerland, Taiwan, United Kingdom, United States
Collaborators--

Timeline

Phase 3Active
2020202120222023202420252026202720282029
First PostedJun 5, 2019
Enrollment StartOct 2, 2019
Primary CompletionJun 29, 2023
Study CompletionMar 10, 2029
TodayJul 2, 2026
Enrollment to primary: 3.7 yearsPosted 7.1 years ago

Interventions

tucatinibdrug

300mg given twice per day by mouth (orally)

placebodrug

Given twice per day orally

T-DM1drug

3.6 mg/kg given into the vein (IV; intravenously) every 21 days