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ENGLISH ABSTRACT
JOURNAL ARTICLE
[Evaluation of Drug Interaction between S-1 and Warfarin].
Gan to Kagaku Ryoho. Cancer & Chemotherapy 2016 January
Prolonged prothrombin time is observed in patients taking warfarin (WF) with a fluoropyrimidine, such as S-1. When WF is combined with S-1, the prothrombin time-international normalized ratio (PT-INR) and dose adjustment of WF should be closely monitored. To date, no clinical data have been reported in terms of the relation between temporal variation of PT-INR and its therapeutic range. In this study, we retrospectively collected patients' clinical data including PT-INR. We identified 21 patients receiving WF therapy before the start of S-1 treatment. Patient characteristics were male/female: 18/3, median age: 69 (range 48-81) years old, cancer of gastric/lung/pancreatic/other: 8/5/4/4, and history of deep vein thrombosis (DVT)/atrial fibrillation (AF)/cerebral infarction (CI)/other: 11/6/2/2. The PT-INR of 16 patients exceeded normal upper limits after taking S-1 with WF. The median time to exceed the PT-INR upper therapeutic range is 25 (range 3-77) days. Patients receiving WF anticoagulant therapy concomitant with S-1 should have their PT-INR closely monitored and WF doses adjusted accordingly.
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