Panitumumab Regimen Evaluation in Colorectal Cancer to Estimate Primary Response to Treatment

The primary objective is to estimate the effect of the human homolog of the Kirsten rat sarcoma-2 virus oncogene (KRAS) mutation status (wild type versus mutant) from tumor tissue on efficacy endpoints in patients with metastatic colorectal cancer (mCRC) receiving second-line chemotherapy with panitumumab after failing first-line treatment.