Panitumumab for Intravenous Infusion 100 mg and 400 mg Special Drug Use Surveillance "Survey on Unresectable, Advanced or Recurrent Colorectal Cancer With Wild-type KRAS Gene" (All-patient Surveillance)

The efficacy and safety of panitumumab (Vectibix) in the routine clinical setting will be studied. Participants of this surveillance will be patients with unresectable, advanced or recurrent colorectal cancer with the wild-type KRAS gene. The planned sample size is 2,000 patients. The usual adult dosage is 6 mg/kg of panitumumab given by intravenous drip infusion over a 60-minute period once every 2 weeks. The dosage may also be reduced as needed, depending on the patient's condition.