Originally published as JCO Early Release 10.1200/JCO.2005.03.133 on February 7 2005
Journal of Clinical Oncology, Vol 23, No 10 (April 1), 2005: pp. 2123-2129
© 2005 American Society of Clinical Oncology.
Randomized Comparison of Low Molecular Weight Heparin and Coumarin Derivatives on the Survival of Patients With Cancer and Venous Thromboembolism
Agnes Y.Y. Lee,
Frederick R. Rickles,
Jim A. Julian,
Michael Gent,
Ross I. Baker,
Chris Bowden,
Ajay K. Kakkar,
Martin Prins,
Mark N. Levine
From the McMaster University; The Henderson Research Centre, Hamilton, ON, Canada; The George Washington University and the Children's National Medical Center, Washington, DC; University of Western Australia, Perth, Australia; Pfizer Inc, New York, NY; Imperial College, London, United Kingdom; and Academic Hospital of Maastricht, Maastricht, the Netherlands
Address reprint requests to Mark N. Levine, MD, Hamilton Health Science, Henderson Hospital, Room 9, 90 Wing, 711 Concession St, Hamilton, ON L8V 1C3, Canada; e-mail: mlevine{at}mcmaster.ca
PURPOSE: Experimental studies and indirect clinical evidence suggest that low molecular weight heparins may have antineoplastic effects. We investigated the influence of a low molecular weight heparin dalteparin on the survival of patients with active cancer and acute venous thromboembolism.
PATIENTS AND METHODS: Survival data were examined in a posthoc analysis in patients with solid tumors and venous thromboembolism who were randomly assigned to dalteparin or a coumarin derivative for 6 months in a multicenter, open-label, randomized, controlled trial. All-cause mortality at 12 months was compared between treatment groups in patients with and without metastatic malignancy. The effect of dalteparin on survival was compared between the two patient subgroups.
RESULTS: During the 12-month follow-up period, 356 of 602 patients with solid tumors and acute venous thromboembolism died. Among patients without metastatic disease, the probability of death at 12 months was 20% in the dalteparin group, as compared with 36% in the oral anticoagulant group (hazard ratio, 0.50; 95% CI, 0.27 to 0.95; P = .03). In patients with metastatic cancer, no difference in mortality between the treatment groups was observed (72% and 69%, respectively; hazard ratio, 1.1; 95% CI, 0.87 to 1.4; P = .46). The observed effects of dalteparin on survival were statistically significantly different between patients with and without metastatic disease (P = .02).
CONCLUSION: The use of dalteparin relative to coumarin derivatives was associated with improved survival in patients with solid tumors who did not have metastatic disease at the time of an acute venous thromboembolic event. Additional studies are warranted to investigate these findings.
Supported by a New Investigator Award from the Canadian Institutes of Health Research/Rx&D Research Program (A.Y.Y.L). M.N.L. is the Buffett Taylor Chair in Breast Cancer Research, McMaster University, Hamilton, Ontario, Canada.
Presented in part as a poster at the 39th Annual Meeting of the American Society of Clinical Oncology, May 31-June 3, 2003, Chicago, IL.
Authors' disclosures of potential conflicts of interest are found at the end of this article.

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