This prospective study will collect safety information from more than 300 subjects treated with Erbitux as final evaluable cases. During the PMS period, subject background, subject's medical (surgery, anti-cancer treatment) history, Erbitux treatment status, concurrent medication, response evaluation, status and reason of discontinuation, all adverse events (AEs; regardless of the causal relationship to Erbitux), and abnormal results of laboratory tests will be collected for the study purpose.