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Objective Oral anticoagulants (OACs), which include direct oral anticoagulants (DOACs) and warfarin, are widely used for the prevention of thromboembolic events in patients with atrial fibrillation (AF). Cancer is associated with a prothrombotic state as well as an increased bleeding risk. Few data are available on the efficacy and safety of OACs in Japanese cancer patients with AF. We sought to investigate the efficacy and safety of OACs in this population. Methods This retrospective cohort study included active cancer patients in whom AF was recorded by electrocardiography in our hospital from January 2014 to December 2016 and who were treated with DOACs or warfarin. Patients were followed for 1 year. The study outcomes were stroke or systemic embolism and major bleeding. Result A total of 224 patients with AF and active cancer were treated with OACs (DOACs, n=127; warfarin, n=97). Overall, stroke or systemic embolism and major bleeding occurred in seven (3.8%/year) and eight (4.9%/year) patients, respectively. Stroke or systemic embolism occurred in three patients in the DOAC group (2.8%/year) and four patients in the warfarin group (5.4%/year). Major bleeding occurred in four patients in the DOAC group (4.0%/year) and four patients in the warfarin group (6.5%/year). Conclusion The rates of stroke or systemic embolism and major bleeding events were not negligible among Japanese cancer patients with AF receiving OACs. Further investigations on the optimal management of Japanese patients with AF and cancer are needed.

Oral Anticoagulants in Japanese Patients with Atrial Fibrillation and Active Cancer