[A case of advanced pancreatic cancer responding to combination chemotherapy with the individual maximum repeatable dose of gemcitabine and oral S-1].

The patient was a 70-year-old man with metastatic pancreatic cancer. After he received combination chemotherapy with gemcitabine and oral S-1 on day 1, he experienced severe general fatigue, anorexia and nausea. Then we changed the dose of gemcitabine from 1,000 mg/m(2) 2 to 500 mg/m(2) according to the criteria for an individual maximum repeatable dose (iMRD) determination method on day 8. His general condition recovered, and treatment schedule of gemcitabine with S-1 was continued sequentially at an outpatient clinic. His tumor marker levels, and the sizes of primary pancreatic tumor and liver metastatic lesions remarkably decreased. Partial response has been obtained for 7 months.