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Aantal asbestvezels in longen voorspelt overleving mesothelioom

24-06-2008 15:45

Er is een relatie tussen het aantal asbestvezels dat in de longen aangetroffen wordt en de levensverwachting van een mesothelioompatiënt.

Dat concluderen Amerikaanse onderzoekers na onderzoek bij 80 mesothelioompatiënten. Deze relatie wordt waarschijnlijk wel beïnvloed door de aanleg/gevoeligheid van de patiënt. Andere factoren die de levensverwachting beïnvloeden zijn het geslacht en het type tumor.

Bron: Christensen, B.C. et. al. (2008). Asbestos burden predicts survival in pleural mesothelioma. Environmental  Health Perspectives, Jun;116(6):723-6.

Abstract

Background: Malignant pleural mesothelioma (MPM) is a rapidly fatal asbestos-associated malignancy with a median survival time of <1 year following diagnosis. Treatment strategy is determined in part using known prognostic factors. OBJECTIVE: The aim of this study was to examine the relationship between asbestos exposure and survival outcome in MPM in an effort to advance the understanding of the contribution of asbestos exposure to MPM prognosis. Methods: We studied incident cases of MPM patients enrolled through the International Mesothelioma Program at Brigham and Women's Hospital in Boston, Massachusetts, using survival follow-up, self-reported asbestos exposure (n=128), and a subset of cases (n=80) with quantitative asbestos fiber burden measures. Results: Consistent with the established literature, we found independent, significant associations between male sex and reduced survival (p<0.04), as well as between nonepithelioid tumor histology and reduced survival (p<0.02). Although self-reported exposure to asbestos was not predictive of survival among our cases, stratifying quantitative asbestos fiber burden [number of asbestos bodies per gram of lung (wet weight)] into groups of low (0-99 asbestos bodies), moderate (100-1,099), and high fiber burden (>1,099), suggested a survival duration association among these groups (p=0.06). After adjusting for covariates in a Cox model, we found that patients with a low asbestos burden had a 3-fold elevated risk of death compared to patients with a moderate fiber burden [95% confidence interval (CI), 0.95-9.5; p=0.06], and patients with a high asbestos burden had a 4.8-fold elevated risk of death (95% CI, 1.5-15.0; p<0.01) versus those with moderate exposure. Conclusion: Our data suggest that patient survival is associated with asbestos fiber burden in MPM and is perhaps modified by susceptibility.