A case of unresectable pancreatic cancer in a 76-year-old female was reported, in which a tumor had liver involvement. She was treated with infusion chemotherapy of mitomycin C (MMC) from gastroduodenal artery and portal vein after palliative operation. A drug was administered via an extracorporeal infusion catheter. MMC was given totally 47 mg from artery and 27 mg from portal vein for 9 months. Then, the serum CA 19-9 level gradually decreased, the metastatic liver tumor disappeared and the pancreatic tumor became smaller. After that, the tumor did not grow. The patient survived for 7 years 11 months until she died from other causes. Thus, it seems that infusion chemotherapy might be tried in some cases of pancreatic cancer.