An Open-label, Single-arm, Multicenter Phase II Study to Evaluate the Efficacy of Amivantamab in Combination With FOLFIRI as a Second-line Treatment in Patients With RAS/BRAF Wild-type Advanced Colorectal Cancer Progressing on Prior Anti-EGFR Based Treatment.

This trial is a multicenter, single arm study of efficacy of amivantamab in combination with FOLFIRI in RAS/BRAF wild-type advanced colorectal cancer patients progressed prior treatment including oxaliplatin based chemotherapy. This trial will be conducted by Severance Hospital that is responsible for the project management of the trial. Patient recruitment will take at 3 institutions. Participants will be treated for up to 24 cycles (approximately 2 years) after initiation of treatment with intravenous 1050mg(BW\<80kg) or 1400mg(BW≥80kg) of amivantamab every 4 weeks in combination with FOLFIRI. FOLFIRI includes folic acid, 5-FU and irinotecan. FOLFIRI will be administered intravenously with folic acid 400 mg/m², 5-FU 2400 mg/m², and irinotecan 180 mg/m² every 2 weeks. This study will use ORR based on RECIST 1.1 criteria as the primary endpoint and the tumor assessment will be done every 8 weeks. Secondary endpoints are DCR, PFS, OS, and safeties. Exploratory biomarkers in tumor tissue and ctDNA in blood will be investigated in both pre-treatment and post-treatment periods.