TY - JOUR T1 - Fiber burden and asbestos-related diseases: an umbrella review JO - Gaceta Sanitaria T2 - AU - Ramada Rodilla,José María AU - Calvo Cerrada,Beatriz AU - Serra Pujadas,Consol AU - Delclos,George L. AU - Benavides,Fernando G. SN - 02139111 M3 - 10.1016/j.gaceta.2021.04.001 DO - 10.1016/j.gaceta.2021.04.001 UR - https://gacetasanitaria.org/es-fiber-burden-asbestos-related-diseases-an-articulo-S0213911121000820 AB - ObjectiveWhat are the levels of asbestos exposure that cause each type of health effect? The objective of this study was to review the available scientific evidence on exposure levels for asbestos and their relationship to health effects. MethodAn umbrella review of English-language reviews and meta-analyses, from 1980 to March 2021 was conducted. We included reviews involving quantified asbestos exposures and health outcomes. The review has been adapted to the indications of the PRISMA declaration. Methodological quality of the selected studies was assessed using the AMSTAR instrument. ResultsWe retrieved 196 references. After applying the search strategy and quality analysis, 10 reviews were selected for in-depth analysis. For lung cancer, the highest risk was observed with exposure to amphiboles. Longer, thinner fibers had the greatest capacity to cause lung cancer, especially those > 10 μm in length. For mesothelioma, longer and thinner fibers were also more pathogenic; amphiboles ≥ 5 μm are especially associated with increased mesothelioma risk. No studies observed an increased risk for lung cancer or mesothelioma at asbestos exposure levels <0.1 f/ml. No reviews provided information on exposure concentrations for pulmonary fibrosis. Currently, there is limited evidence in humans to establish the causal relationship between gastrointestinal cancer and asbestos exposure. ConclusionsBanning all asbestos exposure remains the best measure to preventing its negative health effects. The highest quality reviews and meta-analyses support that there is little risk of lung cancer or mesothelioma at daily exposure levels below 0.1 f/ml. ER -