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ORAL 16 - Clinical Care of Lung Cancer and Advanced Biopsies (ID 115)
- Event: WCLC 2015
- Type: Oral Session
- Track: Treatment of Advanced Diseases - NSCLC
- Presentations: 1
ORAL16.02 - Thromboembolic and Bleeding Risk with Adjuntctive LMWHs Anticoagulation in Lung Cancer Patients. Meta-Analysis of Randomized Trials (ID 2157)
10:45 - 12:15 | Author(s): L. Zolna
Venous thromboembolism (VTE) has been demonstrated one of the leading causes of mortality in lung cancer patients. While incidence of VTE in cancer patients varies from 4-20%, at autopsy VTE accounts for as high as 50%. Various strategies of VTE prophylaxis have been proposed, among them low-molecular weight heparins (LMWHs). While different randomized controlled trials (RCTs) showed benefit with LMWHs in regard to VTE, none single RCT was adequately powered for major bleeding. In a meta-analysis of RCTs we aimed to investigate the relation between thromboembolic and bleeding risk associated with LMWHs anticoagulation in lung cancer patients.
Established methods were used in compliance with the Preferred Reporting Items for Systematic reviews and Meta-Analyses (PRISMA) statement in healthcare interventions. PubMed, EMBASE, CINAHL, Cochrane, Scopus databases as well as major congress proceedings until April 2015 were screened for RCTs comparing LMWHs with control/placebo. Outcomes assessed were VTE and major bleeding. Odds ratios (OR) and 95% confidence intervals were used as summary statistics. Data were analysed according to Intention-to-treat principle.
Four RCTs (N=3097) were included in the meta-analysis (Table 1). Average follow-up was 237 days. In a fixed effects model, LMWHs were associated with a significant 50% reduction of the odds of VTE as compared to controls: OR (95% CI): 0.50 (0.35-0.71); p<0.0001; I=0%; (Figure 1A); the number needed to treat =33. A significant, over 2-fold increase in the odds of major bleeding was observed with LMWHs: OR (95% CI): 2.16 (1.16-4.05); p=0.02; I=0%; (Figure 1B); the number needed to harm was 104.
Table 1. Characteristics of included studiesFigure 1
Study N of pts LMWH Dose NSCLC/SCLC Follow-up (d) Agnelli et al. 2009 279 Nadroparin 3800 IU qd 79.9%-20.1% 112 Altinbas et al. 1-2, 2004 84 Dalteparin 5000 IU qd 0%-100% 301 Haas et al. 2012 546 Certoparin 3000 IU qd 100%-0% 168 Woodruff et al. 2013 2202 Dalteparin 5000 IU qd 82.2%-18.8% 365
Low-molecular weight heparins significantly reduce the risk of venous thromboembolism at a price of increased major bleeding in patients with lung cancer. One episode of major bleeding occurred at every 3 VTEs prevented with LMWHs. Dose-escalation studies are certainly warranted to identify patients who would benefit most from LMWHs.
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