A Phase 3 Study Comparing Tucatinib, Trastuzumab, and mFOLFOX6 to Standard Treatments for First-Line HER2 Positive Metastatic Colorectal Cancer

What this Trial Is About

Researchers are evaluating whether combining tucatinib with trastuzumab and mFOLFOX6 works better than standard treatments for people with HER2 positive colorectal cancer that has spread or cannot be removed by surgery. This Phase 3 study also aims to learn about the side effects that may occur when taking this combination of drugs. Participants have metastatic or unresectable colorectal cancer and are randomly assigned to different treatment groups. Participants are randomly placed in one of two study groups. One group receives tucatinib taken orally twice daily along with trastuzumab given intravenously every 3 weeks and mFOLFOX6 chemotherapy every 2 weeks. The other group receives standard care, which may be mFOLFOX6 alone or combined with bevacizumab or cetuximab, both given intravenously on different schedules. Tissue samples and biopsies are collected before treatment to confirm HER2 positivity and other markers. During the study, participants will have regular evaluations including imaging scans to measure cancer progression, blood tests, and assessments of side effects and quality of life. Progression-free survival is the primary outcome measured for up to about 3 years, with other outcomes like overall survival and response rate also tracked. Safety monitoring continues for about one year after the last treatment. The study lasts several years, with ongoing follow-up to understand long-term effects and benefits.

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