Microplastics and Cancer: Still Searching for Causation.

Microplastics are present in human tumors across multiple organs, but causation of cancer remains unproven despite evidence of associated biological effects.

• Why it matters: Understanding whether microplastics cause cancer is crucial because their widespread presence in the human body raises concerns about potential health risks, yet current evidence is mostly associative or from animal studies.
• What they did: Researchers reviewed existing findings and emphasized the need for longitudinal studies that measure microplastic exposure prior to disease development to establish causality.
• The result: Without direct evidence linking exposure to cancer onset, the field cannot confirm causation, highlighting the importance of future research to clarify microplastics' role in carcinogenesis.