Microplastics and Cancer: Still Searching for Causation

Micro- and nanoplastics have been found in tumors throughout the human body, from the gut and lung to the brain and prostate, and laboratory work ties them to inflammation, DNA damage, and other cancer-related changes. But nearly all that evidence is either associative or drawn from animals and cells. Researchers say a causal verdict will require studies that measure exposure before disease appears, a bar the field has not yet cleared.