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Validation of the diagnosis of mesothelioma and BAP1 protein expression in a cohort of asbestos textile workers from Northern Italy

December 5, 2017 By Thomas Lamb

Background  Diagnosis of mesothelioma based on death certificate is subject to misclassification, which may bias the results of epidemiology studies. A high proportion of mesothelioma harbor mutations in the BRCA1-associated protein 1 (BAP1) gene.

Methods  We searched medical and pathology records and specimens for 127 workers from a textile- asbestos factory in Italy who died during 1963-2013 with a diagnosis of pleural or peritoneal neoplasm or mesothelioma on death certificate, to confirm the diagnosis with immunohistochemistry (IHC) markers. We calculated the odds ratio (OR) of confirmation by selected characteristics and asbestos exposure variables. When sufficient pathology material was available, we analyzed BAP1 protein expression.

Conclusions  We were able to confirm by IHC a small proportion of mesothelioma diagnoses on certificates of deceased asbestos workers, and confirmation correlated with latency of asbestos exposure but not other characteristics. BAP1 protein loss is a frequent event in mesothelioma of asbestos-exposed workers, but does not correlate with exposure.

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Source: Validation of the diagnosis of mesothelioma and BAP1 protein expression in a cohort of asbestos textile workers from Northern Italy


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