Ang Li1, Nicole M Kuderer2, David A Garcia1, Alok A Khorana3, Philip S Wells4, Marc Carrier4, Gary H Lyman5,6. 1. Division of Hematology, Department of Medicine, University of Washington School of Medicine, Seattle, WA, USA. 2. Advanced Cancer Research Group and Department of Medicine, University of Washington, Seattle, WA, USA. 3. Department of Hematology and Medical Oncology, Taussig Cancer Institute and Case Comprehensive Cancer Center, Cleveland Clinic, Cleveland, OH, USA. 4. Department of Medicine, Ottawa Hospital Research Institute, University of Ottawa, Ottawa, ON, Canada. 5. Division of Medical Oncology, Department of Medicine, University of Washington School of Medicine, Seattle, WA, USA. 6. Divisions of Public Health Sciences and Clinical Research, Fred Hutchinson Cancer Research Center, Seattle, WA, USA.
Abstract
BACKGROUND: It is unclear if direct oral anticoagulant (DOAC) is efficacious and safe for prophylaxis of venous thromboembolism (VTE) in ambulatory patients with cancer. METHODS: We performed a systematic review using EMBASE, MEDLINE, and CENTRAL. Inclusion criteria included adult ambulatory patients with cancer, prophylactic use of DOAC, and randomized controlled trials. Exclusion criteria included pediatric patients, inpatient or postoperative setting, therapeutic indication of DOAC, or non-phase III randomized controlled trial. Two authors screened/reviewed articles and abstracted the data. Meta-analysis was performed using random-effects model. Efficacy outcome included overall and symptomatic VTE incidence during the first 6 months. Safety outcomes included major bleeding and clinically relevant non-major bleeding (CRNMB) incidence during the on-treatment period. Subgroup analysis was performed for intermediate- and high-risk Khorana score. RESULTS: A total of 202 records were identified and 28 full-text articles were assessed. Two studies with 1415 participants were included for meta-analysis. For DOAC vs placebo, the relative risks for overall and symptomatic VTE incidence by 6 months were 0.56 (0.35-0.89) and 0.58 (0.29-1.13), respectively. The relative risks for major bleeding and CRNMB while on-treatment were 1.96 (0.80-4.82) and 1.28 (0.74-2.20), respectively. Patients with high-risk Khorana score (3+) derived the largest absolute risk reduction of VTE. CONCLUSIONS: Low-dose DOAC reduces the rate of overall VTE in higher risk cancer patients starting systemic chemotherapy. It may reduce the rate of symptomatic VTE but increase the likelihood of bleeding.
BACKGROUND: It is unclear if direct oral anticoagulant (DOAC) is efficacious and safe for prophylaxis of venous thromboembolism (VTE) in ambulatory patients with cancer. METHODS: We performed a systematic review using EMBASE, MEDLINE, and CENTRAL. Inclusion criteria included adult ambulatory patients with cancer, prophylactic use of DOAC, and randomized controlled trials. Exclusion criteria included pediatric patients, inpatient or postoperative setting, therapeutic indication of DOAC, or non-phase III randomized controlled trial. Two authors screened/reviewed articles and abstracted the data. Meta-analysis was performed using random-effects model. Efficacy outcome included overall and symptomatic VTE incidence during the first 6 months. Safety outcomes included major bleeding and clinically relevant non-major bleeding (CRNMB) incidence during the on-treatment period. Subgroup analysis was performed for intermediate- and high-risk Khorana score. RESULTS: A total of 202 records were identified and 28 full-text articles were assessed. Two studies with 1415 participants were included for meta-analysis. For DOAC vs placebo, the relative risks for overall and symptomatic VTE incidence by 6 months were 0.56 (0.35-0.89) and 0.58 (0.29-1.13), respectively. The relative risks for major bleeding and CRNMB while on-treatment were 1.96 (0.80-4.82) and 1.28 (0.74-2.20), respectively. Patients with high-risk Khorana score (3+) derived the largest absolute risk reduction of VTE. CONCLUSIONS: Low-dose DOAC reduces the rate of overall VTE in higher risk cancerpatients starting systemic chemotherapy. It may reduce the rate of symptomatic VTE but increase the likelihood of bleeding.
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