Effect of fondaparinux 2.5 mg once daily on mortality: a meta-analysis of phase III randomized trials of venous thromboembolism prevention
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1 European Heart Journal Supplements (2008) 10 (Supplement C), C8 C13 doi: /eurheartj/sun004 Effect of fondaparinux 2.5 mg once daily on mortality: a meta-analysis of phase III randomized trials of venous thromboembolism prevention John W. Eikelboom* Thrombosis Service, McMaster Clinic, Hamilton Health Sciences-General Hospital, Hamilton, ON, Canada KEYWORDS Fondaparinux; Low-molecular-weight heparins; Clinical trial; Mortality; Thromboprophylaxis; Venous thromboembolism Introduction Venous thromboembolism affects 1 to 2 per 1000 people in the general population each year, 1,2 and is associated with one out of every 10 deaths in the general population in Europe. 3 Effective methods are available for the prevention of venous thromboembolism, but very few treatments have been shown to reduce mortality (Table 1). Most randomized trials have been underpowered to demonstrate an effect of thromboprophylaxis on mortality and it is estimated that patients would be needed to reliably detect a 50% difference in * Corresponding author. Tel: þ ; fax: þ address: eikelbj@mcmaster.ca Aims: Fondaparinux significantly reduces death in patients with acute coronary syndromes. The effect of fondaparinux on mortality when used for prevention of venous thromboembolism is unknown. We performed a meta-analysis to examine the effect of fondaparinux 2.5 mg once daily on mortality in phase III randomized trials of venous thromboembolism prevention. Methods and results: Eight trials involving patients undergoing major orthopaedic or abdominal surgery or medical patients were included. In five trials, fondaparinux was compared with low-molecular-weight heparin (LMWH); in three trials, the comparator was placebo. The primary efficacy outcome was all-cause mortality up to day 30. The incidence of death was 1.6% (105/6538) in patients treated with fondaparinux compared with 2.1% (134/6547) in patients treated with placebo or LMWH [odds ratio (OR) 0.79; 95% confidence interval (CI) 0.60 to 1.01, P ¼ 0.058; P for heterogeneity ¼ 0.58]. Results were consistent irrespective of whether the comparator was placebo (2.0 vs. 2.6%, OR 0.77; 95% CI: ) or LMWH (1.5 vs. 1.9%, OR 0.78; 95% CI: ). Conclusion: The one-fifth reduction in mortality with fondaparinux suggested in randomized trials of venous thromboembolism prevention is not statistically significant, but is externally consistent with the reduction in mortality observed in registry studies and in randomized trials of fondaparinux in patients with acute coronary syndromes. mortality between two thromboprophylaxis methods. 4 Meta-analyses can provide more reliable estimates of treatment effect than individual trials because they have greater statistical power, and thus represent an alternative approach to determining whether thromboprophylaxis reduces mortality. A meta-analysis of surgical thromboprophylaxis trials showed that unfractionated heparin (UFH) compared with control (placebo or no treatment) reduced the risk of death by 22% (P, 0.02). 5 There was no significant reduction in death in meta-analyses of surgical trials comparing low-molecular-weight heparin (LMWH) or vitamin K antagonists with placebo/untreated control, 6,7 or comparing anticoagulants with no anticoagulants in medical patients with restricted mobility. 8,9 No study comparing Published on behalf of the European Society of Cardiology. All rights reserved. & The Author For permissions please journals.permissions@oxfordjournals.org.
2 Effect of fondaparinux on mortality C9 Table 1 Effect of various thromboprophylaxis strategies in reducing mortality: summary of evidence 5 9,22 24 vs. placebo vs. active comparator Surgical Medical Surgical Medical Mechanical No No Aspirin Probably a Vitamin K antagonists Probably No Unfractionated heparin Yes No No No Low-molecular-weight heparins Probably Yes (patients with cancer) No No a Significantly reduced fatal pulmonary embolism but no impact on all-cause mortality. Figure 1 Mortality in patients with non-st elevation acute coronary syndromes or ST-elevation myocardial infarction treated with fondaparinux 2.5 mg once daily in the randomized, double-blind OASIS-5 (A) and OASIS-6 trials (B), respectively 10,11. LMWH with active comparator has demonstrated an effect on death in any clinical setting. Fondaparinux is the first selective inhibitor of activated coagulation factor X (Xa) approved for clinical use. In patients with non-st-segment elevation acute coronary syndromes (NSTE-ACS), fondaparinux 2.5 mg once daily compared with enoxaparin 1 mg/kg twice daily reduced the risk of death by 17% at 30 days and by 11% at 180 days (Figure 1). 10 In patients with ST-segment elevation myocardial infarction, fondaparinux 2.5 mg once daily compared with placebo or intravenous UFH reduced the risk of death by 13% at 30 days and by 14% at 180 days (Figure 1). 11 Fondaparinux has also been extensively evaluated in multiple randomized trials for the prevention of venous thromboembolism in surgical and medical patients, but an effect on mortality was not demonstrated in individual trials. We performed a meta-analysis of phase III randomized trials comparing fondaparinux 2.5 mg once daily with placebo or approved doses of LMWH to examine the effect of fondaparinux on mortality. Methods Study selection We included all randomized, double-blind, phase III trials comparing a once daily 2.5 mg dose of fondaparinux with placebo or anticoagulant control for the prevention of venous thromboembolism in which mortality at 30 days was reported. The type of comparator, duration of treatment, or duration of follow-up was not used to determine eligibility of studies for inclusion. Uncontrolled studies or studies which did not use a 2.5 mg dose of fondaparinux were excluded. Search strategy Potentially eligible studies were identified by a computerassisted search of the MEDLINE database, using the following keywords: fondaparinux, pentasaccharide, randomized, and controlled trial. The reference lists of original articles and review papers were also examined. Data extraction Since no other studies than those designed by the pharmaceutical companies (Sanofi-Synthelabo then GlaxoSmithKline) developing the drug fondaparinux were identified, the patient data were extracted from the fondaparinux integrated clinical trials database. Data were extracted on trial design, baseline characteristics, interventions, and outcome at 30 days. Outcome measures The primary outcome of the meta-analysis was all-cause mortality at 30 days, where day 1 corresponded to the day of randomization.
3 C10 J.W. Eikelboom Table 2 Main characteristics of the trials included in the meta-analysis Setting Trial n Fondaparinux Comparator Total hip replacement EPHESUS mg once daily starting Total hip PENTATHLON mg once daily starting replacement Major knee surgery PENTAMAKS mg once daily starting Hip fracture PENTHIFRA mg once daily starting surgery Hip fracture PENTHIFRA-PLUS mg once daily starting surgery (extended postoperatively for 25 to 31 days prophylaxis) 16 High-risk abdominal surgery Statistical analyses An individual patient meta-analysis was performed using a fixed effects model with the analyses stratified by trial and based on an intention-to-treat approach. The homogeneity of the treatment effect between studies was assessed using the Breslow-Day homogeneity of odds ratio test. The odds ratios (OR) were estimated with two-sided 95% confidence intervals (CI). An OR equal to one indicates no difference between the treatments, less than one indicates that fondaparinux is better, and more than one that the comparator is better. A sensitivity analysis was performed in which data from the one extended-duration prophylaxis study were excluded to assess its influence on the overall result. Subgroup analyses were performed according to the type of comparator (i.e. fondaparinux vs. placebo and fondaparinux vs. LMWH) in order to evaluate the internal consistency of results. All statistical analyses were performed using SAS software, version 8.02 (SAS Institute Inc., Cary, NC, USA). Results Trials PEGASUS mg once daily starting Abdominal surgery APOLLO mg once daily starting plus intermittent pneumatic compression Medical patients ARTEMIS mg once daily for 6 to 14 days Placebo with restricted mobility Eight trials involving a total of patients were included (Table 2). Seven trials, performed in patients (93.5%), were performed in a surgical context, and one trial (849 patients, 6.5%) was performed in acutely ill medical patients with restricted mobility. 19 Among the surgical trials, five studies were performed in major orthopaedic surgery, and two studies in major abdominal surgery. 17,18 Patient population Enoxaparin 40 mg once daily starting pre-operatively for 5 to 9 days Enoxaparin 30 mg twice daily starting Enoxaparin 30 mg twice daily starting Enoxaparin 40 mg once daily starting pre-operatively for 5 to 9 days 2.5 mg once daily starting postoperatively for days, and placebo for days Dalteparin 2500 IU 2 h preoperatively, then 12 h postoperatively and 5000 IU once daily for 5 to 9 days Placebo plus intermittent pneumatic compression The major orthopaedic surgery trials included patients who were scheduled for primary elective total hip replacement surgery, revision of at least one component of a previously implanted total hip prosthesis, elective major knee surgery, or surgery for a fracture of the upper third of the femur One of the trials in abdominal surgery included high-risk patients who were expected to undergo an abdominal surgery lasting longer than 45 min while under general anaesthesia and aged over 60 years or aged over 40 years with one or more additional risk factors for thromboembolic complications. 17 The qualifying risk factors were obesity, a history of venous thromboembolism, congestive heart failure (NYHA class III or IV), chronic obstructive pulmonary disease, inflammatory bowel disease, or surgery for cancer. In the other abdominal surgery trial, eligible patients were aged over 40 years, weighed over 50 kg, and were scheduled to undergo abdominal surgery expected to last longer than 45 min. 18 The medical thromboprophylaxis trial included patients aged at least 60 years who were expected to require bed rest for at least four days and who were acutely ill with congestive heart failure (NYHA class III or IV), acute respiratory illness in the presence of chronic lung disease, or with clinically diagnosed acute infections or inflammatory disorders such as arthritis, connective tissue diseases, and inflammatory bowel disease. 19 In all the trials, patients with contraindications to anticoagulation, including those at high risk of bleeding or with high serum creatinine concentration (.180 mmol/l), were excluded.
4 Effect of fondaparinux on mortality C11 Baseline characteristics The median age of the patients was 69 years; 31.2% were aged 75 years or more (Table 3). Most patients were women (56.1%), and 28.4% of all patients reported a history of cancer. Interventions The dosage regimens of fondaparinux and comparators are shown in Table 2. Five trials, involving a total of patients (78.5%) compared fondaparinux with LMWH. Four trials involving 2814 patients (21.5%) compared fondaparinux with placebo. Two LMWH agents, enoxaparin and dalteparin, were used as comparators. In surgical studies, the protocol required that the first injection of fondaparinux be administered h postoperatively, and the second injection at least 12 h after the first, but no more than 24 h after surgical closure In six surgical trials, fondaparinux and comparators were given for 5 to 9 days post surgery; patients were then followed for 35 to 49 days after major orthopaedic surgery, or 28 to 32 days after abdominal surgery ,17,18 In a single trial of extended-duration thromboprophylaxis after hip fracture surgery, patients received fondaparinux for days in an open fashion, after which they received fondaparinux or placebo for an additional days, for a total duration Table 3 Patient characteristics Fondaparinux (n ¼ 6538) Comparator (n ¼ 6547) Age, median (range), years 69 (17 97) 69 (17 101) Age 75 years, n (%) 2063 (31.6) 2020 (30.9) Men, n (%) 2855 (43.7) 2886 (44.1) Body mass index, median 26 (13 82) 26 (11 83) (range) kg/m 2 History of venous 250 (3.8) 280 (4.3) thromboembolism, n (%) History of cancer, n (%) 1824 (27.9) 1891 (28.9) History of myocardial 316 (4.8) 325 (5.0) infarction, n (%) History of stroke, n (%) 208 (3.2) 225 (3.4) Concerning the history of previous diseases, patients with missing data were included in the group of patients with no history. Table 4 All deaths on Day 30 Effect of fondaparinux on mortality Fondaparinux 2.5 mg once daily Comparator of treatment of 25 to 31 days; follow-up was up to 32 days after surgery. 16 In the trial of medical patients, fondaparinux or placebo were administered for 6 to 14 days; follow-up was continued up to day In all the studies, the extension of prophylaxis with non-study drugs and treatment of venous thromboembolism arising during the study were left to be discretion of the local investigator. All-cause mortality Fondaparinux compared with control was associated with a non-significant 21% reduction in risk of all-cause mortality, from 2.1% in the control group to 1.6% in the fondaparinux group, corresponding to an absolute difference of 20.44% (95% CI: to 0.02) and an OR of 0.79 (95% CI: 0.60 to 1.01, P ¼ 0.058; P for heterogeneity ¼ 0.58) (Table 4 and Figure 2). Excluding the trial of extended thromboprophylaxis after hip fracture surgery, the respective figures were 2.1% in the control group and 1.6% in the fondaparinux group [OR (95% CI): 0.78 (0.59 to 1.01), P ¼ 0.063; P for heterogeneity ¼ 0.466]. Subgroup analyses The reduction in mortality associated with the fondaparinux administration was consistent, irrespective of whether the comparator was placebo [2.6 vs. 2.0%, OR: 0.77 (0.46 to 1.26)] or LMWH [1.9 vs. 1.5%, OR: 0.78 (0.58 to 1.06)] (P for heterogeneity across subgroups ¼ 0.97). Discussion Our meta-analysis suggests a one-fifth reduction in risk of mortality with fondaparinux 2.5 mg once daily compared with placebo or LMWH when used for the prevention of venous thromboembolism in surgical or medical patients. The reduction in mortality is not statistically significant by conventional criteria, but is remarkably consistent with the reduction in mortality seen with fondaparinux in patients with acute coronary syndromes and was evident irrespective of whether the comparator was placebo or active control, without any statistical evidence of heterogeneity. The most feared complication of venous thromboembolism is fatal pulmonary embolism and the most important goal of thromboprophylaxis is to prevent death. An Odds ratio Absolute Difference P-value P-value for (95% CI) a (95% CI) b heterogeneity vs. placebo 2.0% (28/1405) 2.6% (36/1409) 0.77 (0.46 to 1.26) 20.56% (21.66 to 0.54), vs. LMWH 1.5% (77/5133) 1.9% (98/5138) 0.78 (0.58 to 1.06) 20.41% (20.91 to 0.09) All studies 1.6% (105/6538) 2.1% (134/6547) 0.79 (0.60 to 1.01) 20.44% (20.90 to 0.02) a Odds ratios are adjusted for individual protocol effects. b Absolute differences are unadjusted. CI, confidence interval; LMWH, low-molecular-weight heparins.
5 C12 J.W. Eikelboom Figure 2 Effect of fondaparinux on mortality. CI, confidence interval; HFS, hip fracture surgery; LMWH, low-molecular-weight heparins; OR, odds ratio; MKS, major knee surgery; THR: total hip replacement. Figure 3 Effect of various anticoagulant drugs in reducing all-cause mortality in patients undergoing major orthopaedic surgery 20. LMWH, low-molecular-weight heparins; UFH, unfractionated heparin. effect of thromboprophylaxis on death is difficult to demonstrate in clinical trials because death is relatively uncommon (1 3% in the present meta-analysis) and very large numbers of patients are needed. Thus, no individual trial to date has been adequately powered to demonstrate an effect of anticoagulant thromboprophylaxis on mortality. Furthermore, while UFH has been shown to reduce mortality when compared with placebo/untreated control based on a meta-analysis of trials conducted in the 1970s and 80s, 5 no thromboprophylaxis strategy has been shown to reduce death compared with active control. Our results suggesting a consistent effect of fondaparinux on mortality irrespective of comparator are consistent with the results of a very large retrospective database analysis spanning 509 US hospitals that compared the efficacy and safety of fondaparinux, LMWH (enoxaparin or dalteparin) and UFH in patients undergoing major orthopaedic surgery. 20 In the latter study, fondaparinux compared with UFH or LMWH significantly reduced all-cause mortality by 70 and 45%, respectively, (Figure 3) without any increase in bleeding risk. The mechanisms through which fondaparinux may exert a beneficial effect on preventing death in trials of venous thromboembolism prevention merit further exploration. In patients at risk of venous thromboembolism, it seems reasonable to assume that fondaparinux prevents death by preventing fatal pulmonary embolism. However, fondaparinux is also highly effective for preventing recurrent myocardial infarction and stroke in patients with acute coronary syndromes, 10,11 and arterial vascular events are believed to account for about one-half of all deaths following major orthopaedic surgery (60% of the population included in this metaanalysis underwent orthopaedic surgery). 21 In order to address this issue, we are presently conducting, in a blinded fashion, an exploratory analysis on the effect of fondaparinux on cause-specific mortality, including cardiovascular mortality. The OASIS-5 trial demonstrated that fondaparinux compared with enoxaparin reduced all cause mortality by 17% at 30 days in patients with NSTE-ACS. More than 90% of deaths were cardiovascular deaths (96.3% of these deaths were clearly due to a cardiovascular cause and 3.7% were due to unknown causes). 10 Fatal bleeding accounted for,10% of cardiovascular deaths (8.0% of all deaths at 9 days and 6% of all deaths at 30 days were due to bleeding), but at 180 days.90% of the excess deaths in patients treated with enoxaparin occurred in patients who also experienced bleeding. Therefore, we propose also to examine the impact of bleeding on death in venous thromboembolism prevention trials. Finally, a benefit of LMWH for preventing death has been demonstrated in cancer patients, 22 and it is possible that fondaparinux exerts an effect on mortality in venous thromboembolism prevention trials by reducing cancer deaths. The most important limitation of this study is that it represents a post hoc exploratory analysis that pooled data from randomized controlled trials performed in different clinical settings with different comparators. In addition, while the results are provocative, the reduction
6 Effect of fondaparinux on mortality C13 in mortality with fondaparinux was not statistically significant. For these reasons, our results should be considered hypothesis-generating rather than representing definite evidence of a mortality benefit of fondaparinux when used for the prevention of venous thromboembolism. Further analyses may clarify the mechanism of any effect of fondaparinux on mortality in venous thromboprophylaxis trials. In conclusion, the results of our meta-analysis of trials using fondaparinux 2.5 mg once daily for the prevention of venous thromboembolism are consistent with the results obtained with fondaparinux 2.5 mg once daily in patients with acute coronary syndromes which demonstrated a 14 to 17% reduction in mortality at 30 days. Acknowledgements The author gratefully acknowledges the expert statistical assistance of Timothy E. Rolfe (GlaxoSmithKline, Harlow, UK). Conflict of interest: none declared. References 1. Kearon C. 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N Engl J Med 1988;318: Mismetti P, Laporte S, Darmon JY, Buchmuller A, Decousus H. Meta-analysis of low molecular weight heparin in the prevention of venous thromboembolism in general surgery. Br J Surg 2001;88: Mismetti P, Laporte S, Zufferey P, Epinat M, Decousus H, Cucherat M. Prevention of venous thromboembolism in orthopedic surgery with vitamin K antagonists: a meta-analysis. J Thromb Haemost 2004;2: Mismetti P, Laporte-Simitsidis S, Tardy B, Cucherat M, Buchmuller A, Juillard-Delsart D, Decousus H. Prevention of venous thromboembolism in internal medicine with unfractionated or low-molecularweight heparins: a meta-analysis of randomized clinical trials. Thromb Haemost 2000;83: Dentali F, Douketis JD, Gianni M, Lim W, Crowther MA. Meta-analysis: anticoagulant prophylaxis to prevent symptomatic venous thromboembolism in hospitalised medical patients. Ann Intern Med 2007; 146: Yusuf S, Mehta SR, Chrolavicius S, Afzal R, Pogue J, Granger CB, Budaj A, Peters RJ, Bassand JP, Wallentin L, Joyner C, Fox KA, Fifth Organization to Assess Strategies in Acute Ischemic Syndromes Investigators. Comparison of fondaparinux and enoxaparin in acute coronary syndromes. N Engl J Med 2006;354: Yusuf S, Mehta SR, Chrolavicius S, Afzal R, Pogue J, Granger CB, Budaj A, Peters RJ, Bassand JP, Wallentin L, Joyner C, Fox KA, OASIS-6 Trial Group. Effects of fondaparinux on mortality and reinfarction in patients with acute ST-segment elevation myocardial infarction: the OASIS-6 randomized trial. JAMA 2006;295: Bauer KA, Eriksson BI, Lassen MR, Turpie AG, Steering Committee of the Pentasaccharide in Major Knee Surgery Study. Fondaparinux compared with enoxaparin for the prevention of venous thromboembolism after elective major knee surgery. N Engl J Med 2001;345: Eriksson BI, Bauer KA, Lassen MR, Turpie AG, Steering Committee of the Pentasaccharide in Hip-Fracture Surgery Study. Fondaparinux compared with enoxaparin for the prevention of venous thromboembolism after hip-fracture surgery. N Engl J Med 2001;345: Lassen MR, Bauer KA, Eriksson BI, Turpie AG, European Pentasaccharide Elective Surgery Study (EPHESUS) Steering Committee. Postoperative fondaparinux versus preoperative enoxaparin for prevention of venous thromboembolism in elective hip-replacement surgery: a randomised double-blind comparison. Lancet 2002;359: Turpie AG, Bauer KA, Eriksson BI, Lassen MR, PENTATHLON 2000 Study Steering Committee. Postoperative fondaparinux versus postoperative enoxaparin for prevention of venous thromboembolism after elective hip-replacement surgery: a randomised double-blind trial. Lancet 2002;359: Eriksson BI, Lassen MR, PENTasaccharide in HIp-FRActure Surgery Plus Investigators. Duration of prophylaxis against venous thromboembolism with fondaparinux after hip fracture surgery: a multicenter, randomized, placebo-controlled, double-blind study. Arch Intern Med 2003;163: Agnelli G, Bergqvist D, Cohen AT, Gallus AS, Gent M. Randomized clinical trial of postoperative fondaparinux versus perioperative dalteparin for prevention of venous thromboembolism in high-risk abdominal surgery. Br J Surg 2005;92: Turpie AGG, Bauer KA, Caprini JA, Comp PP, Gent M, Muntz JE. Fondaparinux combined with intermittent pneumatic compression versus intermittent pneumatic compression alone for prevention of venous thromboembolism after abdominal surgery: a randomized, doubleblind comparison. J Thromb Haemost 2007;5: Cohen AT, Davidson BL, Gallus AS, Lassen MR, Prins MH, Tomkowski W, Turpie AG, Egberts JF, Lensing AW, ARTEMIS Investigators. Efficacy and safety of fondaparinux for the prevention of venous thromboembolism in older acute medical patients: randomised placebo controlled trial. BMJ 2006;332: Shorr AF, Kwong LM, Sarnes M, Happe L, Farrelly E, Mody-Patel N. Venous thromboembolism after orthopedic surgery: Implications of the choice for prophylaxis. Thromb Res 2007;121: Dahl OE, Caprini JA, Colwell CW Jr, Frostick SP, Haas S, Hull RD, Laporte S, Stein PD. Fatal vascular outcomes following major orthopedic surgery. Thromb Haemost 2005;93: Lazo-Langner A, Goss GD, Spaans JN, Rodger MA. The effect of low-molecular-weight heparin on cancer survival. A systematic review and meta-analysis of randomized trials. J Thromb Haemost 2007;5: Antiplatelet Trialists Collaboration. Collaborative overview of randomised trials of antiplatelet therapy III: Reduction in venous thrombosis and pulmonary embolism by antiplatelet prophylaxis among surgical and medical patients. Antiplatelet Trialists Collaboration. 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