Cholangiocarcinoma is a highly fatal disease with poor prognosis. While Cholangiocarcinoma is generally rare in Western countries, it is more common in Korea, with an estimate of 3500 cases diagnosed annually. Currently, surgical resection remains the only potentially curative treatment, but many patients develop recurrence. Thus, effective postoperative adjuvant therapy is required to prolong survival in patients with cholangiocarcinoma. However, no standard postoperative treatment has been established yet.