Warfarin is the most used anticoagulant worldwide and its anti-tumour potential has been demonstrated in multiple experimental cancer model systems. In a Norwegian cohort study published in JAMA Internal Medicine (online, 6 November 2017), 1,256,725 individuals born between 1924 and 1954 were divided into two groups: warfarin users (92,942) and non-users (1,163,783).
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