Peritoneal mesothelioma and asbestos exposure: a population-based case-control study in Italy, 2000-2021

Area of Science:

• Occupational Health
• Epidemiology
• Oncology

Background:

• Peritoneal mesothelioma is a rare cancer strongly linked to asbestos exposure.
• Understanding the quantitative relationship between occupational asbestos exposure and mesothelioma risk is crucial for public health.
• Previous studies have varied in their assessment of exposure levels and diagnostic criteria.

Purpose of the Study:

• To investigate the association between occupational asbestos exposure and the risk of developing peritoneal mesothelioma in Italy.
• To quantify the risk using different exposure assessment methods, including a job-exposure matrix and expert evaluation.
• To analyze data from a large case-control study encompassing a significant period.

Main Methods:

• A case-control study design was employed, utilizing data from the National Mesothelioma Registry (2000-2021).
• Cases were matched with controls based on region, sex, and age, with exposure assessed using the SYN-JEM quantitative job-exposure matrix.
• Logistic regression models were used to estimate odds ratios (ORs) and 90% confidence intervals (CIs), adjusting for relevant covariates.

Main Results:

• A significant association was found between any occupational asbestos exposure and peritoneal mesothelioma (OR=3.66).
• Increased cumulative asbestos exposure was also strongly associated with higher risk (OR=1.55 per log10-transformed unit).
• Expert-based evaluations yielded even higher ORs, indicating a pronounced risk, though with potential for bias.

Conclusions:

• Peritoneal mesothelioma demonstrates a clear and significant association with occupational asbestos exposure.
• The findings are consistent across different exposure assessment methodologies, reinforcing the causal link.
• This study underscores the persistent risk posed by asbestos in occupational settings and its contribution to mesothelioma incidence.