A Study of Tucatinib With Trastuzumab and mFOLFOX6 Versus Standard of Care Treatment in First-line HER2+ Metastatic Colorectal Cancer (MOUNTAINEER-03)

Seagen, a wholly owned subsidiary of Pfizer

Status and phase: Enrolling; Phase 3

Conditions: Colorectal Neoplasms

Treatments: Drug: levoleucovorin; Drug: leucovorin; Drug: fluorouracil; Drug: cetuximab; Drug: bevacizumab; Drug: oxaliplatin; Drug: tucatinib; Drug: trastuzumab

Study type: Interventional

Funder types: Industry

Identifiers

NCT05253651

C4251008 (Other Identifier)

SGNTUC-029

2024-514180-25-00 (Registry Identifier)

Details and patient eligibility

About

This study is being done to find out if tucatinib with other cancer drugs works better than standard of care to treat participants with HER2 positive colorectal cancer. This study will also determine what side effects happen when participants take this combination of drugs. A side effect is anything a drug does to the body besides treating your disease.

Participants in this study have colorectal cancer that has spread through the body (metastatic) and/or cannot be removed with surgery (unresectable).

Participants will be assigned randomly to the tucatinib group or standard of care group. The tucatinib group will get tucatinib, trastuzumab, and mFOLFOX6. The standard of care group will get either:

• mFOLFOX6 alone,
• mFOLFOX6 with bevacizumab, or
• mFOLFOX6 with cetuximab mFOLFOX6 is a combination of multiple drugs. All of the drugs given in this study are used to treat this type of cancer.

Enrollment: 400 estimated patients

Sex: All

Ages: 18+ years old

Volunteers: No Healthy Volunteers

Inclusion criteria

• Histologically and/or cytologically confirmed adenocarcinoma of the colon or rectum which is locally advanced unresectable or metastatic

• Able to provide the most recently available formalin-fixed paraffin-embedded (FFPE) tumor tissue blocks (or freshly sectioned slides) obtained prior to treatment initiation to a central laboratory

  • If archival tissue is not available, a newly-obtained baseline biopsy of an accessible tumor lesion is required within 35 days prior to start of study treatment

• HER2+ disease as determined by a tissue based assay performed at a central laboratory.

• Participant has rat sarcoma viral oncogene homolog wild-type (RAS WT) disease as determined by local or central testing. For central RAS analysis, tissue sample must be analyzed within 1 year of biopsy date.

• Radiographically measurable disease per RECIST v1.1 with:

  • At least one site of disease that is measurable and that has not been previously irradiated, or
  • If the participant has had previous radiation to the target lesion(s), there must be evidence of progression since the radiation

• Eastern Cooperative Oncology Group (ECOG) Performance Status of 0 or 1

• CNS Inclusion - based on contrast brain magnetic resonance imaging, participants may have any of the following:

  • No evidence of brain metastases
  • Previously treated brain metastases which are asymptomatic

Exclusion criteria

• Prior systemic anticancer therapy for colorectal cancer (CRC) in the locally advanced unresectable or metastatic setting; note that participants may have received a maximum of 2 doses of mFOLFOX6 in the locally advanced/unresectable or metastatic setting prior to randomization.

  • Note: May have received chemotherapy for CRC in the adjuvant setting if it was completed >6 months prior to enrollment

• Radiation therapy within 14 days prior to enrollment (or within 7 days in the setting of stereotactic radiosurgery)

• Previous treatment with anti-HER2 therapy

• Ongoing Grade 3 or higher neuropathy

• Active or untreated gastrointestinal (GI) perforation at the time of screening.

Trial design

Primary purpose: Treatment

Allocation: Randomized

Interventional model: Parallel Assignment

Masking: None (Open label)

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400 participants in 2 patient groups

Tucatinib Arm

Experimental group

Description:

Tucatinib + trastuzumab + mFOLFOX6

Treatment:

Drug: trastuzumab

Drug: tucatinib

Drug: oxaliplatin

Drug: fluorouracil

Drug: levoleucovorin

Drug: leucovorin

Standard of Care Arm

Active Comparator group

Description:

Either (1) mFOLFOX6, (2) mFOLFOX6 and bevacizumab, or (3) mFOLFOX6 and cetuximab

Treatment:

Drug: oxaliplatin

Drug: bevacizumab

Drug: cetuximab

Drug: fluorouracil

Drug: levoleucovorin

Drug: leucovorin