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

What this study is 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.

Who can join (things the study team will check)

✅ You may be able to join if…

• 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

🚫 You may not be able to join if…

• 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.

Where this trial is running

• Palo Verde Hematology Oncology, Glendale, Arizona, United States
• Mayo Clinic Building - Phoenix, Phoenix, Arizona, United States
• Mayo Clinic Hospital, Phoenix, Arizona, United States
• Mayo Clinic, Scottsdale, Arizona, United States
• Los Angeles Cancer Network - Anaheim, Anaheim, California, United States
• Kaiser Permanente Anaheim Kraemer Medical Offices, Anaheim, California, United States
• Kaiser Permanente Baldwin Park Medical Center, Baldwin Park, California, United States
• Kaiser Permanente Bellflower Medical Offices, Bellflower, California, United States
• Kaiser Permanente Fontana Medical Center, Fontana, California, United States
• Los Angeles Cancer Network - Fountain Vally, Fountain Valley, California, United States
• Los Angeles Hematology Oncology Medical Group, Glendale, California, United States
• Los Angeles Hematology Oncology Medical Group, Glendale, California, United States

+ 369 more sites.

Who to contact

Pfizer CT.gov Call Center · 1-800-718-1021 · ClinicalTrials.gov_Inquiries@pfizer.com

It's completely normal to call and ask questions before deciding anything. Mention the study ID: NCT05253651.