Background
Patients with cancer-associated venous thromboembolism (VTE) are at high risk of recurrent thrombosis and bleeding during prolonged anticoagulation. While full-dose direct oral anticoagulants (DOACs) are widely used, the safety and efficacy of reduced-dose regimens for extended treatment remain uncertain.
Objectives
This study compared the safety and efficacy of reduced-dose vs full-dose DOACs in the extended treatment of cancer-associated VTE.
Methods
We conducted a systematic review and meta-analysis of randomized controlled trials comparing reduced- and full-dose DOACs in adults with active cancer and VTE. Searches were performed in PubMed, Embase, and the Cochrane Library. The primary outcomes were a composite of VTE recurrence, major bleeding, or clinically relevant nonmajor bleeding, and the combined risk of major or clinically relevant nonmajor bleeding.
Results
Three randomized controlled trials comprising 2361 patients were included. Two trials evaluated apixaban 2.5 mg vs 5 mg twice daily, and 1 evaluated rivaroxaban 10 mg vs 20 mg once daily. Reduced-dose DOACs were associated with a lower risk of the composite outcome (relative risk, 0.77; 95% CI, 0.64-0.93; P = .006) and reduced bleeding (relative risk, 0.76; 95% CI, 0.62-0.93; P = .008) than full-dose DOACs. No significant differences were observed in major bleeding, clinically relevant nonmajor bleeding, VTE recurrence, or all-cause mortality when analyzed individually.
Conclusions
Reduced-dose DOACs appear as effective as full-dose regimens for extended treatment of cancer-associated VTE, with a lower risk of bleeding. These findings support their use as a safer long-term anticoagulation strategy in selected patients.
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