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Micro- and nanoplastic exposure and cancer: current evidence, mechanistic pathways, and translational challenges
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This review pulls together existing research on tiny plastic particles (microplastics and nanoplastics) that we're exposed to through water, food, and air, and their possible links to cancer. Scientists have found these particles may cause cell stress, inflammation, and other changes in the body that could help cancer develop or spread—but so far this evidence comes mainly from lab and animal studies, not solid proof in humans. The bottom line: microplastics probably don't cause cancer on their own, but they may make the body's environment more favorable for tumors to grow, which is worth taking seriously even though more research is needed before we can say anything definitive.
Abstract: Microplastics and nanoplastics are emerging contaminants widely detected in water, soil, air, food, and a range of human biological samples. Their potential implications for cancer biology have recently attracted growing interest at the interface of environmental health, toxicology, and oncology. Available evidence suggests that micro- and nanoplastic exposure may be associated with several solid tumors and certain hematological malignancies, and may influence tumor-related processes through oxidative stress, chronic inflammation, DNA damage and repair dysregulation, microbiota disturbance, metabolic reprogramming, and alterations in the immune microenvironment. However, the current evidence base remains limited and heterogeneous, relying predominantly on in vitro experiments, animal studies, and small-scale analyses of human tissues or biospecimens. Direct evidence supporting an independent causal role in human tumor initiation and progression is still insufficient. Interpretation is further complicated by major discrepancies between engineered particles commonly used in laboratory studies and environmentally relevant particles encountered in real-world exposure settings, which are typically aged, heterogeneous, and associated with adsorbed chemicals and co-contaminants. In this review, we summarize current knowledge on environmental occurrence and human exposure to micro- and nanoplastics, critically examine their reported associations with different tumor types, synthesize the principal mechanistic pathways implicated in cancer-related effects, and discuss the major methodological limitations and translational barriers in this field. Overall, current evidence supports a cautious model in which micro- and nanoplastics may modify, rather than independently cause, tumor biology by linking cellular stress and inflammatory-immune, microbial, and metabolic alterations to tumor initiation, progression, metastatic potential, treatment resistance, and outcome-related associations.
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Microplastics, Nanoplastics, and Cancer: A Narrative Review
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This review pulls together current research on tiny plastic particles (microplastics and nanoplastics) that have been found in our blood, lungs, placenta, and even tumors, and asks whether they might contribute to cancer. Lab studies show these particles can cause cell damage, inflammation, and other changes linked to cancer development, but scientists still can't prove that plastic exposure actually causes cancer in people—the evidence so far shows these particles are present and biologically active, not that they're definitely dangerous. Bottom line: it's a legitimate concern worth taking seriously, but we need better long-term studies before drawing firm conclus
Microplastic-induced carcinogenesis: Molecular mechanisms, cellular interactions, and toxicological implications
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Tiny plastic particles that we breathe, eat, and touch every day are now showing up in our blood, lungs, and other organs, and this review of existing research explains how they might contribute to cancer. Microplastics can trigger cell damage, inflammation, and disrupted signaling in ways linked to tumor growth, and they can also act like tiny rafts that ferry other harmful chemicals and toxins deeper into our bodies. While scientists haven't proven microplastics directly cause cancer in humans yet, the mounting evidence is a strong signal that reducing plastic exposure and pushing for more research should be a public health pri
Microplastics and human cancer risk: A comprehensive review of environmental, molecular, and nanotoxicological perspectives
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This review pulls together lab research suggesting tiny plastic particles in our environment could damage cells, cause inflammation, and disrupt processes linked to cancer growth. While these findings raise real concern, scientists still lack direct proof that microplastics cause cancer in humans, so more long-term research is needed before drawing firm conclusions.
Beyond Classic Carcinogens: Micro- and Nanoplastics (MNPs) as Pervasive Factors in Cancer Risk
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This review pulls together existing research suggesting that tiny plastic particles (microplastics), which are now found throughout our environment and even inside our bodies, may do more than just pollute — they might contribute to cancer by causing inflammation, cell damage, and harmful changes to our genes. While this doesn't prove microplastics cause cancer, it highlights a concerning new area of research worth watching, especially since these particles are so widespread in our food, water, and air that avoiding them entirely is nearly impossible.
Microplastics as emerging carcinogens: from environmental pollutants to oncogenic drivers
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This review examines growing evidence that microplastics and nanoplastics may play a role in cancer development, with these particles found in human tumor tissues from the lungs, colon, stomach, breast, and other organs. The particles appear to promote cancer through chronic inflammation, oxidative stress, DNA damage, and disruption of key cancer-related signaling pathways. While direct proof of causation in humans is still lacking, the accumulating evidence from lab studies, animal experiments, and human tissue analysis suggests microplastics deserve serious attention as potential contributors to cancer risk.
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