Panitumumab and Chemotherapy in Patients With Advanced Colorectal Cancer After Prior Therapy With Bevacizumab

PRIMARY OBJECTIVES: I. To determine the median progression-free survival in patients treated with leucovorin calcium, fluorouracil, and irinotecan hydrochloride (FOLFIRI) and panitumumab for K-ras and NRAS wild-type, metastatic colorectal carcinoma who have already progressed on FOLFIRI + Bevacizumab. SECONDARY OBJECTIVES: I. To determine the frequency and severity of toxicities of the regimens. II. To determine overall response rate. III. To determine the median overall survival and the overall survival rate at 1 year. OUTLINE: Patients receive panitumumab intravenously (IV) over 60-90 minutes, leucovorin calcium IV over 90 minutes, fluorouracil IV continuously over 46 hours, and irinotecan hydrochloride IV over 90 minutes on days 1 and 15. Courses repeat every 28 days in the absence of disease progression or unacceptable toxicity. After completion of study treatment, patients are followed up periodically.