Therefore, better efficacy is not available via surgeries alone resulting in great emphasis on adjuvant chemoradiotherapy. In 1997, gemcitabine was confirmed to be the standard chemotherapy for pancreatic cancer. However, it has not been proved that gemcitabine significantly improved prognosis in long term follow-up while some patients are refractory to gemcitabine. Hence, development of more effective chemotherapy is urgent.