[A case of sclerosing cholangitis caused by oral chemotherapy with S-1]

We report a case of sclerosing cholangitis caused by oral chemotherapy with S-1. A 79-year-old woman with a history of hypertension presented with epigastric discomfort. Upper gastrointestinal endoscopy revealed advanced gastric cancer in the gastric antrum and abdominal computed tomography showed multiple lymph node metastasis. The patient underwent chemotherapy with S-1. Since 2 months later, blood chemistry analysis showed liver dysfunction and hyperbilirubinemia, and chemotherapy was discontinued. Endoscopic retrograde cholangiopancreatography revealed stenosis of the bile duct at the hepatic hilum. There was no evidence of tumor in the liver. We diagnosed chemotherapy-induced sclerosing cholangitis (CISC) caused by S-1. Although treatment with ursodeoxycholic acid and corticosteroids was temporarily effective, she eventually died of CISC and gastric cancer. To the best of our knowledge, this is the first case report of CISC caused by S-1. We present this rare condition with a review of the literature.