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Global prostate cancer risk associated with microplastic exposure: a statistical and machine learning analysis
Summary
Researchers looked at microplastic exposure and prostate cancer rates across 22 countries and found that the amount of microplastic actually found in people's stool (along with heavy metal exposure) was more closely linked to cancer rates than how much plastic pollution existed in a country's air, water, or food. This suggests what matters most may be how much plastic actually builds up inside the body, not just how much we're exposed to — but this is early, exploratory research based on country-level data, not proof that microplastics cause cancer, so more direct studies in individuals are needed.
Introduction: Prostate cancer is one of the most commonly diagnosed malignancies among men worldwide, with higher reported incidence in many high-income countries. Environmental factors are receiving increasing attention as potential contributors to cancer development. Microplastics, which are found in air, water, food, and personal care items, are one possible risk factor. Methodology: Data from 22 nations were investigated to examine whether an association exists between exposure to microplastics and the rate of prostate cancer. Data on exposure were combined from several sources, such as stool particles, breathed air, drinking water, seafood intake, and personal care products. Statistical and machine learning methods, such as K-means clustering, principal component analysis, and random forest modeling, were applied to find the most important exposure variables linked to cancer risk. Results: Stool microplastic concentrations and heavy metal burden showed the strongest model-based associations with prostate cancer incidence. Countries with higher external exposure indicators did not consistently show higher reported prostate cancer incidence. This pattern suggests that external exposure metrics alone may be insufficient to explain country-level variation. Internal retention and tissue-response pathways remain plausible hypotheses, but they require direct validation using individual-level and tissue-based data. Discussion: The findings support the need to integrate exposure pathways, biomonitoring indicators, and biological-response markers when studying microplastic-related cancer risk. However, this study was limited by its ecological design, cross-sectional structure, and small sample size of 22 countries. Therefore, the results should be interpreted as exploratory and hypothesis-generating rather than causal. Further longitudinal and individual-level studies are required to validate these associations.