18 and older, any sex, with Metastatic Colorectal Adenocarcinoma. Patients with the condition only — healthy volunteers not accepted.
Results — posted to ClinicalTrials.gov
Per-arm endpoint measurements with 95% confidence intervals where reported. Source: trial results section.
Confirmed Objective Response Rate (cORR) Per RECIST v1.1 Per Blinded Independent Central Review (BICR) in Pooled Cohorts A+BPrimary· Up to 46.6 months
cORR was defined as the percentage of participants with confirmed CR or PR according to RECIST v1.1. CR was defined as the disappearance of all target lesions and each target lymph node must have reduction in short axis to less than (\<)1.0 centimeter (cm). PR was defined as at least a 30 percentage (%) decrease in post-baseline sum of the diameters (sum of the longest diameter for all target lesions plus the sum of the short axis of all the target lymph nodes at current evaluation) taking as reference the baseline sum of diameters.
Group
Value
95% CI
Tucatinib+Trastuzumab (Cohorts A+B)
39.3
28.8 – 50.5
ORR by 12 Weeks of Treatment Per RECIST v1.1 According to BICR AssessmentSecondary· Up to 3 months
ORR per BICR by 12 Weeks was defined as the percentage of participants with CR or PR by 12 weeks of treatment, and before time of crossover (Cohort C), whichever came earlier. CR was defined as the disappearance of all target lesions and each target lymph node must have reduction in short axis to more than \<1.0 cm. PR was defined as at least a 30% decrease in post-baseline sum of the diameters (sum of the longest diameter for all target lesions plus the sum of the short axis of all the target lymph nodes at current evaluation) taking as reference the baseline sum of diameter.
Group
Value
95% CI
Tucatinib+Trastuzumab (Cohorts A+B)
28.6
19.2 – 39.5
Tucatinib Pre-Crossover (Cohort C)
3.3
0.1 – 17.2
Duration of Response (DOR) Per RECIST v1.1 According to BICR AssessmentSecondary· Up to 64.1 months
DOR was defined as the time from the first objective response (CR or PR that is subsequently confirmed) to documented PD per RECIST v1.1 or death from any cause, whichever occurred first. CR was defined as the disappearance of all target lesions and each target lymph node must have reduction in short axis to more than \<1.0 cm. PR was defined as at least a 30% decrease in post-baseline sum of the diameters (PBSD) (sum of the longest diameter for all target lesions plus the sum of the short axis of all the target lymph nodes at current evaluation) taking as reference the BSD. PD was defined as:
Group
Value
95% CI
Tucatinib+Trastuzumab (Cohorts A+B)
15.2
8.9 – 20.5
Tucatinib Pre-Crossover (Cohort C)
NA
NA – NA
Progression-Free Survival (PFS) Per RECIST v1.1 According to BICR Assessment for Pooled Cohorts A+BSecondary· Up to 64.1 months
PFS was defined as the time from start of study treatment (Cohort A) or date of randomization (Cohort B) to documented disease progression (as determined by BICR per RECIST v1.1) or death from any cause, whichever occurred first. PD was defined as: at least one new malignant lesion, which also included any lymph node that was normal at baseline (\<1.0 cm short axis) and increased to \>=1.0 cm short axis during follow-up or at least a 20% increase in post-baseline sum of the diameters (PBSD) taking as reference the minimum sum of the diameters (MSD). In addition, the PBSD must also demonstrate
Group
Value
95% CI
Tucatinib+Trastuzumab (Cohorts A+B)
8.1
4.2 – 10.2
Overall Survival (OS) in Pooled Cohorts A+BSecondary· Up to 71.8 months
OS was defined as the time from start of study treatment (Cohort A) or randomization (Cohort B) to date of death due to any cause.
Group
Value
95% CI
Tucatinib+Trastuzumab (Cohorts A+B)
23.9
18.7 – 28.3
Number of Participants With Adverse Events (AEs): Interim AnalysisSecondary· Up to 49.3 months
AE: Any untoward medical occurrence in a participant or clinical investigational participant administered a medicinal product and which does not necessarily have a causal relationship with this treatment. Treatment emergent AEs (TEAEs): Events that were new or worsened on or after receiving the first dose of study treatment (tucatinib or trastuzumab) and up through 30 days after the last dose of study treatment (tucatinib or trastuzumab). Serious AE (SAE): An event that at any dose led to death; life-threatening; required inpatient hospitalization/prolongation of existing hospitalization; pers
Any TEAE
Group
Value
95% CI
Tucatinib+Trastuzumab (Cohorts A+B)
82
Tucatinib Pre-Crossover (Cohort C)
28
Tucatinib-related TEAE
Group
Value
95% CI
Tucatinib+Trastuzumab (Cohorts A+B)
63
Tucatinib Pre-Crossover (Cohort C)
22
Trastuzumab-related TEAE
Group
Value
95% CI
Tucatinib+Trastuzumab (Cohorts A+B)
58
Tucatinib Pre-Crossover (Cohort C)
NA
Any grade 3-5 TEAE
Group
Value
95% CI
Tucatinib+Trastuzumab (Cohorts A+B)
33
Tucatinib Pre-Crossover (Cohort C)
8
Trastuzumab-related grade 3-5 TEAE
Group
Value
95% CI
Tucatinib+Trastuzumab (Cohorts A+B)
6
Tucatinib Pre-Crossover (Cohort C)
NA
Tucatinib-related grade 3-5 TEAE
Group
Value
95% CI
Tucatinib+Trastuzumab (Cohorts A+B)
8
Tucatinib Pre-Crossover (Cohort C)
2
Any Treatment-Emergent Serious AE (TESAE)
Group
Value
95% CI
Tucatinib+Trastuzumab (Cohorts A+B)
19
Tucatinib Pre-Crossover (Cohort C)
3
Tucatinib-related TESAE
Group
Value
95% CI
Tucatinib+Trastuzumab (Cohorts A+B)
3
Tucatinib Pre-Crossover (Cohort C)
1
Number of Participants With AEs: Final AnalysisSecondary· Up to 65.1 months
AE: Any untoward medical occurrence in a participant or clinical investigational participant administered a medicinal product and which does not necessarily have a causal relationship with this treatment. Treatment emergent AEs (TEAEs): Events that were new or worsened on or after receiving the first dose of study treatment (tucatinib or trastuzumab) and up through 30 days after the last dose of study treatment (tucatinib or trastuzumab). SAE: An event that at any dose led to death; life-threatening; required inpatient hospitalization/prolongation of existing hospitalization; persistent/signif
Any TEAE
Group
Value
95% CI
Tucatinib+Trastuzumab (Cohorts A+B)
82
Tucatinib Post-Crossover (Cohort C)
23
Tucatinib-related TEAE
Group
Value
95% CI
Tucatinib+Trastuzumab (Cohorts A+B)
64
Tucatinib Post-Crossover (Cohort C)
15
Trastuzumab-related TEAE
Group
Value
95% CI
Tucatinib+Trastuzumab (Cohorts A+B)
59
Tucatinib Post-Crossover (Cohort C)
13
More than or equal to (>=) Grade 3 TEAE
Group
Value
95% CI
Tucatinib+Trastuzumab (Cohorts A+B)
35
Tucatinib Post-Crossover (Cohort C)
9
Tucatinib-related >= grade 3 TEAE
Group
Value
95% CI
Tucatinib+Trastuzumab (Cohorts A+B)
8
Tucatinib Post-Crossover (Cohort C)
2
Trastuzumab-related >= grade 3 TEAE
Group
Value
95% CI
Tucatinib+Trastuzumab (Cohorts A+B)
6
Tucatinib Post-Crossover (Cohort C)
2
Any Treatment-Emergent Serious AE (TESAE)
Group
Value
95% CI
Tucatinib+Trastuzumab (Cohorts A+B)
20
Tucatinib Post-Crossover (Cohort C)
6
Tucatinib-related TESAE
Group
Value
95% CI
Tucatinib+Trastuzumab (Cohorts A+B)
3
Tucatinib Post-Crossover (Cohort C)
0
Number of Participants With AEs Resulting in Dose Modification: Interim AnalysisSecondary· Up to 49.3 months
Dose modification included dose reduction and dose withheld by investigator due to AEs. Dose holds were defined as any instances where planned administration of the study drug was temporarily withheld or interrupted at the direction of the treating physician. Dose reductions of trastuzumab were not allowed; if trastuzumab could not be restarted after being held for a TEAE, it was discontinued.
Tucatinib dose held
Group
Value
95% CI
Tucatinib+Trastuzumab (Cohorts A+B)
20
Tucatinib Pre-Crossover (Cohort C)
3
Tucatinib dose reduced
Group
Value
95% CI
Tucatinib+Trastuzumab (Cohorts A+B)
8
Tucatinib Pre-Crossover (Cohort C)
1
Trastuzumab dose held
Group
Value
95% CI
Tucatinib+Trastuzumab (Cohorts A+B)
24
Tucatinib Pre-Crossover (Cohort C)
NA
Trastuzumab infusion interrupted (received full dose within 24 hrs)
Group
Value
95% CI
Tucatinib+Trastuzumab (Cohorts A+B)
6
Tucatinib Pre-Crossover (Cohort C)
NA
Trastuzumab infusion stopped early (full dose not received)
Group
Value
95% CI
Tucatinib+Trastuzumab (Cohorts A+B)
1
Tucatinib Pre-Crossover (Cohort C)
NA
Number of Participants With AEs Resulting in Dose Modification: Final AnalysisSecondary· Up to 65.1 months
Dose modification included dose reduction and dose withheld by investigator due to AEs. Dose holds were defined as any instances where planned administration of the study drug was temporarily withheld or interrupted at the direction of the treating physician. Dose reductions of trastuzumab were not allowed; if trastuzumab could not be restarted after being held for a TEAE, it was discontinued. Drug interruption included infusion interrupted (full dose received within 24hrs).
Tucatinib dose held
Group
Value
95% CI
Tucatinib+Trastuzumab (Cohorts A+B)
23
Tucatinib Post-Crossover (Cohort C)
7
Tucatinib dose reduced
Group
Value
95% CI
Tucatinib+Trastuzumab (Cohorts A+B)
9
Tucatinib Post-Crossover (Cohort C)
2
Trastuzumab dose held
Group
Value
95% CI
Tucatinib+Trastuzumab (Cohorts A+B)
27
Tucatinib Post-Crossover (Cohort C)
2
Trastuzumab infusion interrupted
Group
Value
95% CI
Tucatinib+Trastuzumab (Cohorts A+B)
6
Tucatinib Post-Crossover (Cohort C)
0
Number of Participants With Treatment-Emergent Laboratory Abnormalities (Hematology): Interim AnalysisSecondary· Up to 49.3 months
The following hematology laboratory parameters were assessed: Hemoglobin decreased; leukocytes decreased; neutrophils decreased and Platelets decreased. Treatment emergent laboratory abnormalities were defined as abnormalities that were new or worsened on or after receiving the first dose of study treatment and up through 30 days after the last dose of study treatment. NCI CTCAE v4.03 was used for the lab parameters. Grade 1: mild; Grade 2: moderate; Grade 3: severe or clinically significant; Grade 4: life-threatening.
Hemoglobin decreased, Grade 1
Group
Value
95% CI
Tucatinib+Trastuzumab (Cohorts A+B)
28
Tucatinib Pre-Crossover (Cohort C)
6
Hemoglobin decreased, Grade 2
Group
Value
95% CI
Tucatinib+Trastuzumab (Cohorts A+B)
8
Tucatinib Pre-Crossover (Cohort C)
2
Hemoglobin decreased, Grade 3
Group
Value
95% CI
Tucatinib+Trastuzumab (Cohorts A+B)
3
Tucatinib Pre-Crossover (Cohort C)
0
Hemoglobin decreased, Grade 4
Group
Value
95% CI
Tucatinib+Trastuzumab (Cohorts A+B)
0
Tucatinib Pre-Crossover (Cohort C)
0
Leukocytes decreased, Grade 1
Group
Value
95% CI
Tucatinib+Trastuzumab (Cohorts A+B)
14
Tucatinib Pre-Crossover (Cohort C)
3
Leukocytes decreased, Grade 2
Group
Value
95% CI
Tucatinib+Trastuzumab (Cohorts A+B)
5
Tucatinib Pre-Crossover (Cohort C)
0
Leukocytes decreased, Grade 3
Group
Value
95% CI
Tucatinib+Trastuzumab (Cohorts A+B)
0
Tucatinib Pre-Crossover (Cohort C)
0
Leukocytes decreased, Grade 4
Group
Value
95% CI
Tucatinib+Trastuzumab (Cohorts A+B)
0
Tucatinib Pre-Crossover (Cohort C)
0
Number of Participants With Treatment-Emergent Laboratory Abnormalities (Hematology): Final AnalysisSecondary· Up to 65.1 months
The following hematology laboratory parameters were assessed: Hemoglobin decreased; hemoglobin increased; leukocytes decreased; lymphocytes decreased; neutrophils decreased and Platelets decreased. Treatment emergent laboratory abnormalities were defined as abnormalities that were new or worsened on or after receiving the first dose of study treatment and up through 30 days after the last dose of study treatment. NCI CTCAE v4.03 was used for the lab parameters. Grade 1: mild; Grade 2: moderate; Grade 3: severe or clinically significant; Grade 4: life-threatening.
Hemoglobin decreased, All grades
Group
Value
95% CI
Tucatinib+Trastuzumab (Cohorts A+B)
42
Tucatinib Post-Crossover (Cohort C)
9
Hemoglobin decreased, Grade 3
Group
Value
95% CI
Tucatinib+Trastuzumab (Cohorts A+B)
3
Tucatinib Post-Crossover (Cohort C)
0
Hemoglobin decreased, Grade 4
Group
Value
95% CI
Tucatinib+Trastuzumab (Cohorts A+B)
0
Tucatinib Post-Crossover (Cohort C)
0
Hemoglobin increased: All grades
Group
Value
95% CI
Tucatinib+Trastuzumab (Cohorts A+B)
3
Tucatinib Post-Crossover (Cohort C)
0
Hemoglobin increased: Grade 3
Group
Value
95% CI
Tucatinib+Trastuzumab (Cohorts A+B)
0
Tucatinib Post-Crossover (Cohort C)
0
Hemoglobin increased: Grade 4
Group
Value
95% CI
Tucatinib+Trastuzumab (Cohorts A+B)
0
Tucatinib Post-Crossover (Cohort C)
0
Leukocytes decreased, All grades
Group
Value
95% CI
Tucatinib+Trastuzumab (Cohorts A+B)
21
Tucatinib Post-Crossover (Cohort C)
5
Leukocytes decreased, Grade 3
Group
Value
95% CI
Tucatinib+Trastuzumab (Cohorts A+B)
0
Tucatinib Post-Crossover (Cohort C)
0
Number of Participants With Treatment-Emergent Laboratory Abnormalities (Chemistry): Interim AnalysisSecondary· Up to 49.3 months
The following chemistry laboratory parameters were assessed: Potassium increased; potassium decreased; aspartate aminotransferase increased; creatinine increased; alkaline phosphatase increased; total bilirubin increased. Treatment emergent laboratory abnormalities were defined as abnormalities that were new or worsened on or after receiving the first dose of study treatment and up through 30 days after the last dose of study treatment. NCI CTCAE v5.0 was used for creatinine increased. NCI CTCAE v4.03 was used for the other laboratory parameters. Grade 1: mild; Grade 2: moderate; Grade 3: seve
Potassium increased, Grade 1
Group
Value
95% CI
Tucatinib+Trastuzumab (Cohorts A+B)
5
Tucatinib Pre-Crossover (Cohort C)
1
Potassium increased, Grade 2
Group
Value
95% CI
Tucatinib+Trastuzumab (Cohorts A+B)
1
Tucatinib Pre-Crossover (Cohort C)
0
Potassium increased, Grade 3
Group
Value
95% CI
Tucatinib+Trastuzumab (Cohorts A+B)
0
Tucatinib Pre-Crossover (Cohort C)
1
Potassium increased, Grade 4
Group
Value
95% CI
Tucatinib+Trastuzumab (Cohorts A+B)
0
Tucatinib Pre-Crossover (Cohort C)
0
Potassium decreased, Grade 1
Group
Value
95% CI
Tucatinib+Trastuzumab (Cohorts A+B)
13
Tucatinib Pre-Crossover (Cohort C)
3
Potassium decreased, Grade 2
Group
Value
95% CI
Tucatinib+Trastuzumab (Cohorts A+B)
0
Tucatinib Pre-Crossover (Cohort C)
0
Potassium decreased, Grade 3
Group
Value
95% CI
Tucatinib+Trastuzumab (Cohorts A+B)
1
Tucatinib Pre-Crossover (Cohort C)
1
Potassium decreased, Grade 4
Group
Value
95% CI
Tucatinib+Trastuzumab (Cohorts A+B)
0
Tucatinib Pre-Crossover (Cohort C)
0
Adverse events — posted to ClinicalTrials.gov
Time frame: All-cause mortality: From start of study treatment to death by any cause (maximum up to 71.8 months); adverse events were followed during the safety reporting period (from Day 1 through 30 days after the last dose of study treatment) maximum up to 65.1 months.
Reporting threshold: 2%.
Adverse-event reports describe events observed during the trial — not all are caused by the drug.
Tucatinib+Trastuzumab (Cohorts A+B)
Serious: 20/86 (23%)
Deaths: 54/86
Tucatinib Pre-Crossover (Cohort C)
Serious: 3/30 (10%)
Deaths: 2/31
Tucatinib Post-Crossover (Cohort C)
Serious: 6/28 (21%)
Deaths: 15/28
Serious adverse events (38 terms)
Reaction
System
Tucatinib+Trastuzumab (Coh…
Tucatinib Pre-Crossover (C…
Tucatinib Post-Crossover (…
Large intestinal obstruction
Gastrointestinal disorders
—
—
—
Small intestinal obstruction
Gastrointestinal disorders
—
—
—
Urinary tract infection
Infections and infestations
—
—
—
Abdominal pain
Gastrointestinal disorders
—
—
—
Rectal perforation
Gastrointestinal disorders
—
—
—
COVID-19 pneumonia
Infections and infestations
—
—
—
Angina unstable
Cardiac disorders
—
—
—
Cardiac failure
Cardiac disorders
—
—
—
Colitis
Gastrointestinal disorders
—
—
—
Constipation
Gastrointestinal disorders
—
—
—
Dyspepsia
Gastrointestinal disorders
—
—
—
Gastrointestinal obstruction
Gastrointestinal disorders
—
—
—
Nausea
Gastrointestinal disorders
—
—
—
Fatigue
General disorders
—
—
—
Malaise
General disorders
—
—
—
Bile duct stone
Hepatobiliary disorders
—
—
—
Cholangitis
Hepatobiliary disorders
—
—
—
Cholecystitis
Hepatobiliary disorders
—
—
—
Anorectal infection
Infections and infestations
—
—
—
Kidney infection
Infections and infestations
—
—
—
Sepsis
Infections and infestations
—
—
—
Urinary tract infection bacterial
Infections and infestations
—
—
—
Humerus fracture
Injury, poisoning and procedural complications
—
—
—
Radius fracture
Injury, poisoning and procedural complications
—
—
—
Ulna fracture
Injury, poisoning and procedural complications
—
—
—
Other adverse events (148 terms — click to expand)
This trial studies how well the drug tucatinib works when given with trastuzumab and when given by itself. The participants in this trial have HER2-positive (HER2+) metastatic colorectal cancer (mCRC). 'Metastatic' means that the cancer has spread to other parts of the body.
In the first part of this study, participants enrolled into Cohort A and received both tucatinib and trastuzumab. In the second part of this study, participants are randomly assigned to either Cohort B or Cohort C. Participants in Cohort B will receive tucatinib and trastuzumab. Participants in Cohort C will receive tucatinib. Participants in Cohort C who do not respond to therapy may have an option to receive tucatinib plus trastuzumab.
Publications & conference data
8 peer-reviewed publications reference this trial (live from Europe PMC):
NCT07413939 — RO7771950 Versus Tucatinib in Combination With Trastuzumab and Capecitabine in People With Locally Advanced or Metastati
· Phase 2, PHASE3
· not yet recruiting
NCT07441460 — A Phase III Study of KN026 in Combination With HB1801 as Adjuvant Therapy for Resectable HER2-Positive Breast Cancer
· Phase 3
· recruiting
NCT07402473 — EUREKA Study:Phase 2 Study to Optimize Neoadjuvant Therapy in HER2-positive Early-stage Breast Cancer
· Phase 2
· not yet recruiting
NCT07377643 — IBI354 With or Without Pertuzumab Versus Taxane, Trastuzumab and Pertuzumab in HER2-positive Metastatic Breast Cancer
· Phase 3
· recruiting
NCT07366840 — RC48 Combined With Chemotherapy in HER2-Positive Advanced Breast Cancer Patients With Prior TOP1i-ADC Failure
· Phase 2, PHASE3
· not yet recruiting
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Currently open trials in the same condition.
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Other Seagen Inc. trials
Trials by the same sponsor.
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· Phase 1
· withdrawn
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· Phase 1
· terminated
NCT04993677 — A Study of SEA-CD40 Given With Other Drugs in Cancers
· Phase 2
· completed
NCT04499924 — Tucatinib, Trastuzumab, Ramucirumab, and Paclitaxel Versus Paclitaxel and Ramucirumab in Previously Treated HER2+ Gastro
· Phase 2, PHASE3
· completed
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· Phase 1
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Publications: Europe PMC API search by NCT ID, retrieved 10 June 2026
Drug + disease cross-links: matched in real time against Drug Landscape's normalised drug + company + condition tables
Sponsor: as reported to ClinicalTrials.gov by Seagen Inc.
Last refreshed: 26 November 2024
Drug Landscape aggregates and links these public records for informational use only. Always verify against the primary source before clinical or regulatory decisions. Canonical URL: https://druglandscape.com/trial/NCT03043313.