The authors sought to define the incidence of symptomatic venous thromboembolism (VTE) in patients harboring malignant gliomas.
The authors conducted a retrospective analysis of data obtained in all cases of malignant glioma diagnosed in California during a 6-year period; the occurrence of a VTE was identified using linked hospital discharge data. The Cox proportional hazard model was used to analyze the association of specific risk factors with the development of a VTE or death within 2 years of the cancer diagnosis.
Among 9489 cases, the 2-year cumulative incidence of VTE was 7.5% (715 cases), with a rate of 16.1 events per 100 person-years during the first 6 months. Three hundred ninety-one (55%) of these 715 cases were diagnosed within 61 days of major neurosurgery. Risk factors for VTE included older age (hazard ratio [HR] 2.6, confidence interval [CI] 2.0–3.4 for age range 65–74 years compared with ≤ 45 years), glioblastoma multiforme histology (HR 1.7, CI 1.4–2.1), three or more chronic comorbidities (HR 3.5, CI 2.8–4.3 [compared with no comorbidity]), and neurosurgery within 61 days (HR 1.7, CI 1.3–2.3). Patients in whom a VTE was present were at higher risk of dying within 2 years (HR 1.3, CI 1.2–1.4). In a nested case–control analysis of all VTE cases, there was no association between insertion of a vena cava filter and the risk of a recurrent VTE.
In patients harboring a glioma there was a very high incidence of symptomatic VTEs, particularly within 2 months of neurosurgery. The development of a VTE was associated with a 30% increase in the risk of death within 2 years. Further studies are needed to determine if risk stratification and the use of medical prophylaxis after neurosurgery improves outcomes.
Abbreviations used in this paper:AA = anaplastic astrocytoma; CI = confidence interval; GBM = glioblastoma multiforme; HR = hazard ratio; ICD-9-CM = International Classification of Diseases, 9th Revision, Clinical Modification; IVC = inferior vena cava; PE = pulmonary embolism; VTE = venous thromboembolism.
Address reprint requests to: Richard H. White, M.D., Division of General Internal Medicine, University of California at Davis, Suite 2400, 4150 V Street, Sacramento, California 95817. email:
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