Drugs / Tucatinib
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Tucatinib

also known as ONT-380 · ARRY-380 · Irbinitinib · MK-7119 · Tukysa

Small molecule targets ERBB2 via inhibition

Developed for
HER2 positive breast carcinoma · breast cancer · metastatic malignant neoplasm in the brain · female breast carcinoma · gastroesophageal junction adenocarcinoma · non-small cell lung carcinoma · colon adenocarcinoma · esophageal adenocarcinoma
+25 more · gastric adenocarcinoma · invasive breast carcinoma · neoplastic meningitis · non-Hodgkin lymphoma · plasma cell myeloma · rectum adenocarcinoma · biliary tract neoplasm · breast carcinoma by gene expression profile · breast neoplasm · cancer · cancer of unknown primary site · cervical cancer · cholangiocarcinoma · colorectal adenocarcinoma · colorectal cancer · colorectal carcinoma · colorectal neoplasm · gallbladder carcinoma · gastric cancer · gastroesophageal adenocarcinoma · Her2-receptor negative breast cancer · malignant colon neoplasm · malignant leptomeningeal tumor · synchronous bilateral breast carcinoma · urothelial neoplasm
Investigated by
Seagen Inc. · Pfizer · Pfizer · National Cancer Institute (NCI) · AstraZeneca · Criterium, Inc.
+63 more · Genentech, Inc. · Novartis · UNICANCER · Academic and Community Cancer Research United · Bristol-Myers Squibb · Cascadian Therapeutics Inc. · Daiichi Sankyo · Dana-Farber Cancer Institute · Eli Lilly and Company · Institut Curie · Jazz Pharmaceuticals · Johns Hopkins University · Memorial Sloan Kettering Cancer Center · Merck Sharp & Dohme LLC · QuantumLeap Healthcare Collaborative · Translational Breast Cancer Research Consortium · ALX Oncology Inc. · ARCAGY/ GINECO GROUP · Alliance for Clinical Trials in Oncology · American Society of Clinical Oncology · Array BioPharma · Baptist Health South Florida · Bayer · Biocon Biologics Inc. · Boehringer Ingelheim · Breast Cancer Trials, Australia and New Zealand · Canadian Cancer Trials Group · Carey Anders, M.D. · Eurofins · Foundation Medicine · Georgetown University · Gruppo Oncologico del Nord-Ovest · Hoffmann-La Roche · Indiana University · Jonathan Riess · Jonsson Comprehensive Cancer Center · M.D. Anderson Cancer Center · MedSIR · Merck Institute for Therapeutic Research · Parexel · Peking University International Hospital · Providence Health & Services · RemeGen Co., Ltd. · Reva Basho · SCRI Development Innovations, LLC · Seattle Genetics (now a wholly owned subsidiary of Pfizer) · Second Affiliated Hospital, School of Medicine, Zhejiang University · Servier · Silverback Therapeutics · Spanish Breast Cancer Research Group · Sun Yat-sen University · Sunnybrook Health Sciences Centre · Taiho Oncology, Inc. · The Netherlands Cancer Institute · TransCode Therapeutics · University of Alabama at Birmingham · University of California, San Francisco · University of Chicago · University of Colorado, Denver · University of Michigan · University of Texas · University of Washington · Zhejiang University

Regulatory milestones approvals, filings & regulatory actions · 3 recorded

MilestoneJurisdictionBrandIndicationDateSentence it was read from
Label expansion US (FDA) TUKYSA — 2023-01-19 fda.gov ↗
Approved EU (EMA) Tukysa — 2021-02-11 europa.eu ↗
Approved US (FDA) TUKYSA — 2020-04-17 fda.gov ↗

Trials 61

PhaseRegistry idDatesIndicationSponsorStatusOutcome
Phase 115 trials · 1 met primary
Phase 1 NCT05553522 Jan 2024 → Dec 2025 HER2 positive breast carcinoma, metastatic malignant neoplasm in the brain Baptist Health South Florida Terminated No outcome recorded Stop: Enrollment
Phase 1 NCT06067776 Jan 2024 → Jan 2025 overdue non-small cell lung carcinoma Jonathan Riess Not yet recruiting No outcome recorded
Phase 1 NCT06162559 Dec 2023 → Aug 2026 overdue breast cancer The Netherlands Cancer Institute Recruiting No outcome recorded
Phase 1 NCT05382364 Jun 2022 → Dec 2026 expected HER2 positive breast carcinoma, colorectal cancer, gastroesophageal adenocarcinoma Pfizer Active not recruiting No outcome recorded
Phase 1 NCT03846583 Jun → Sep 2020 breast cancer Dana-Farber Cancer Institute Withdrawn No outcome recorded Stop: Enrollment
Phase 1 NCT03914755 May → Aug 2019 — Seagen Inc. Completed No outcome recorded
Phase 1 NCT03826602 Feb → Mar 2019 — Seagen Inc. Completed No outcome recorded
Phase 1 NCT03777761 Dec 2018 → Mar 2019 — Seagen Inc. Completed Met primary
Phase 1 NCT03722823 Oct 2018 → May 2019 — Seagen Inc. Completed No outcome recorded
Phase 1 NCT03723395 Sep → Dec 2018 — Seagen Inc. Completed No outcome recorded
Phase 1/210 trials
Phase 1/2 NCT07494448 Jul 2026 → Dec 2027 expected HER2 positive breast carcinoma MedSIR Not yet recruiting No outcome recorded
Phase 1/2 NCT06686394 Feb 2025 → Apr 2030 expected breast cancer Merck Sharp & Dohme LLC Recruiting No outcome recorded
Phase 1/2 NCT05868226 Feb 2023 → Dec 2030 expected HER2 positive breast carcinoma, colon adenocarcinoma, hormone receptor-positive breast cancer, metastatic malignant neoplasm +2 QuantumLeap Healthcare Collaborative Recruiting No outcome recorded
Phase 1/2 NCT05230810 Aug 2022 → Mar 2026 overdue HER2 positive breast carcinoma Criterium, Inc. Active not recruiting No outcome recorded
Phase 1/2 NCT04512261 Jun 2022 → Jun 2024 HER2 positive breast carcinoma, metastatic malignant neoplasm in the brain Reva Basho Withdrawn No outcome recorded
Phase 1/2 NCT05319873 Apr 2022 → Apr 2027 expected HER2 positive breast carcinoma, invasive breast carcinoma Jonsson Comprehensive Cancer Center Active not recruiting No outcome recorded
Phase 1/2 NCT05091528 Feb → Jul 2022 HER2 positive breast carcinoma, non-small cell lung carcinoma Silverback Therapeutics Terminated No outcome recorded Stop: Business
Phase 1/2 NCT04896320 Dec 2021 → Jun 2023 female breast carcinoma Providence Health & Services Withdrawn No outcome recorded Stop: Enrollment
Phase 1/2 NCT04538742 Dec 2020 → Jan 2025 overdue breast cancer AstraZeneca Active not recruiting No outcome recorded
Phase 1/2 NCT03054363 Nov 2017 → Jan 2023 breast cancer University of Colorado, Denver Completed No outcome recorded
Phase 229 trials · 2 met primary
Phase 2 NCT07193394 Jan 2026 → Dec 2028 expected Her2-receptor negative breast cancer Institut Curie Recruiting No outcome recorded
Phase 2 NCT06439693 Aug 2024 → Mar 2030 expected HER2 positive breast carcinoma, estrogen-receptor positive breast cancer, female breast carcinoma Dana-Farber Cancer Institute Recruiting No outcome recorded
Phase 2 NCT06157892 May 2024 → Jul 2029 expected HER2 positive breast carcinoma, gastric cancer, gastroesophageal junction adenocarcinoma, triple-negative breast carcinoma Pfizer Active not recruiting No outcome recorded
Phase 2 NCT05458674 Jan 2024 → Jun 2027 expected breast carcinoma by gene expression profile Criterium, Inc. Active not recruiting No outcome recorded
Phase 2 NCT05955170 Dec 2023 → Dec 2027 expected HER2 positive breast carcinoma Institut Curie Recruiting No outcome recorded
Phase 2 NCT05800275 Dec 2023 → Dec 2026 expected HER2 positive breast carcinoma, malignant leptomeningeal tumor, neoplastic meningitis UNICANCER Recruiting No outcome recorded
Phase 2 NCT06016387 Nov 2023 → Dec 2026 expected HER2 positive breast carcinoma Sunnybrook Health Sciences Centre Recruiting No outcome recorded
Phase 2 NCT05356897 Oct 2023 → Sep 2024 colon adenocarcinoma, rectum adenocarcinoma Academic and Community Cancer Research United Withdrawn No outcome recorded
Phase 2 NCT05748834 Jul 2023 → Nov 2027 expected breast cancer SCRI Development Innovations, LLC Recruiting No outcome recorded
Phase 2 NCT05062889 May 2023 → Oct 2027 malignant colon neoplasm Gruppo Oncologico del Nord-Ovest Suspended No outcome recorded Stop: Enrollment
Phase 2/31 trial
Phase 2/3 NCT04499924 Mar 2021 → Apr 2024 esophageal adenocarcinoma, gastric adenocarcinoma, gastroesophageal junction adenocarcinoma Seagen Inc. Completed No outcome recorded
Phase 34 trials · 2 met primary
Phase 3 NCT05253651 Oct 2022 → Dec 2027 expected colorectal neoplasm Pfizer Recruiting No outcome recorded
Phase 3 NCT05132582 Mar 2022 → Sep 2025 overdue HER2 positive breast carcinoma Pfizer Active not recruiting Met primary
Phase 3 NCT04457596 Mar 2021 → Jan 2028 expected HER2 positive breast carcinoma, invasive breast carcinoma, synchronous bilateral breast carcinoma Alliance for Clinical Trials in Oncology Active not recruiting No outcome recorded
Phase 3 NCT03975647 Oct 2019 → Jun 2023 overdue HER2 positive breast carcinoma Pfizer Active not recruiting Met primary
Phase not stated2 trials
— NCT04220203 — HER2 positive breast carcinoma Pfizer Approved for marketing No outcome recorded
— NCT03424473 — — Seagen Inc. No longer available No outcome recorded
Comparator or background therapy6 trials
Phase 0 NCT07318389 Background Jun 2026 → Nov 2027 expected colorectal cancer M.D. Anderson Cancer Center Not yet recruiting No outcome recorded
Phase 1 NCT06239467 Background Feb 2024 → Dec 2026 expected breast cancer OnKure, Inc. Active not recruiting No outcome recorded
Phase 1 NCT01921335 Comparator Aug 2013 → Mar 2018 HER2 positive breast carcinoma, metastatic malignant neoplasm in the brain Dana-Farber Cancer Institute Completed No outcome recorded
Phase 2 NCT05227131 Background May 2022 → Oct 2024 HER2 positive breast carcinoma MedSIR Withdrawn No outcome recorded Stop: Business
Phase 2 NCT05190445 Background Nov 2021 → Feb 2023 overdue carcinoma Pieris Pharmaceuticals GmbH Active not recruiting No outcome recorded

News releases announcing trial results or a regulatory action · 5

DateIssuerRelease
2026-10-07 Pfizer Regulatory Pfizer’s TUKYSA Regimen Receives FDA Approval as Front-Line Maintenance Treatment for HER2+ Metastatic Breast Cancer pfizer.com ↗
Today's FDA approval marks the next chapter for TUKYSA, bringing it into the front-line maintenance setting and offering patients a chemotherapy-free option that can help delay disease progression after initial treatment.
2026-04-21 Pfizer Results Pfizer Showcases Oncology Innovation and Next-Generation Pipeline at ASCO 2026 pfizer.com ↗
These results support TUKYSA’s potential use as part of a chemotherapy-free, first-line maintenance strategy for HER2+ MBC.
2025-12-10 Pfizer Results TUKYSA Added to First-Line Maintenance Therapy Extends Median Progression-Free Survival by Over 8 Months in Patients with HER2+ Metastatic Breast Cancer pfizer.com ↗
In HER2CLIMB-05, the median progression-free survival (PFS) was 24.9 months (95% CI: 21.3-not reached) in the TUKYSA arm and 16.3 months (95% CI:12.6-18.7) in the placebo arm, representing an extension in median PFS of 8.6 months.
2025-10-14 Pfizer Results TUKYSA Combination Significantly Improves Progression-Free Survival as First-Line Maintenance in HER2+ Metastatic Breast Cancer in HER2CLIMB-05 Trial pfizer.com ↗
The trial met its primary endpoint, demonstrating a statistically significant and clinically meaningful improvement in progression-free survival (PFS) by investigator assessment in the TUKYSA arm versus the placebo arm.
2024-04-29 Pfizer Results Pfizer Highlights Progress in Accelerating Breakthrough Cancer Medicines at ASCO 2024 Annual Meeting pfizer.com ↗
An oral presentation on extended duration of response from the Phase 3 MOUNTAINEER trial adds to the positive profile of TUKYSA in colorectal cancer.

Evidence & citations 10 cited values

Every value below carries the sentence it was read from. 70 sources stand behind the page.

FieldValueCited text
Known as Tucatinib “ONT-380 (tucatinib) is a potent selective inhibitor of HER2 with intracranial activity in preclinical models.” PMID 32461105 ↗ May 2020
65

“Tucatinib: 300mg po Q12H” NCT04760431 ↗

“Drug: Tucatinib” NCT05583110 ↗

“Drug: Tucatinib” NCT02892123 ↗

NCT03914755 ↗

NCT05323955 ↗

NCT05230810 ↗

NCT05382364 ↗

NCT05041842 ↗

NCT03424473 ↗

NCT06439693 ↗

Show 55 more sources

Known as ARRY-380 ClinicalTrials.gov intervention name — accepted as the source's own label NCT00650572 ↗
Known as Irbinitinib ChEMBL registry synonym — accepted as the source's own label CHEMBL3989868 ↗
Known as MK-7119 ChEMBL registry synonym — accepted as the source's own label CHEMBL3989868 ↗
Known as ONT-380 “A Phase 1, Open Label, Safety, Tolerability, and Pharmacokinetic Study of Tucatinib (ONT-380) in Healthy Japanese and Caucasian Subjects” NCT03914755 ↗
4

“ONT-380 (tucatinib) is a potent selective inhibitor of HER2 with intracranial activity in preclinical models.” PMID 32461105 ↗ May 2020

“Tucatinib (ONT-380) is a potent, highly selective, oral HER2 small molecule tyrosine kinase inhibitor (TKI)” NCT04789096 ↗

“Tucatinib (ONT-380) will be administered orally, twice per day on days 1-21 of each cycle.” NCT01983501 ↗

“Tucatinib (ONT-380)” NCT07193394 ↗

Known as Tukysa ChEMBL registry synonym — accepted as the source's own label CHEMBL3989868 ↗
Action Inhibit “HER2 inhibitor” NCT00650572 ↗
Modality Small molecule “Tucatinib is a potent and selective oral HER2 tyrosine kinase inhibitor” PMID 29804905 ↗ May 2018
Route Oral “oral” NCT00650572 ↗
Target ERBB2 “Tucatinib is an oral, potent, human epidermal growth factor receptor 2 (HER2)-specific tyrosine kinase inhibitor (TKI) being developed as a novel treatment for...” PMID 29955792 ↗ Sep 2018