There is NO evidence? I found these 10 papers that seems to indicate there is some emerging evidence.
1. “The micro(nano)plastics perspective” (Molecular Cancer, 2025) — overview of micro(nano)plastics and potential links to cancer 
Link: https://molecular-cancer.biomedcentral.com/articles/10.1186/s12943-025-02230-z 2. “Insights into the potential carcinogenicity of micro (nano)plastics” (Domenech et al., 2023) — review of evidence of MNPLs’ carcinogenic potential  Link: https://pubmed.ncbi.nlm.nih.gov/36739075/ 3. “Microplastics: a cancer-causing agent for humans and …” (Jindal et al.) — argues MPs as risk for cancer and reviews mechanisms  Link: https://pmc.ncbi.nlm.nih.gov/articles/PMC11925826/ 4. “Worker studies suggest unique liver carcinogenicity potential of polyvinyl chloride microplastics” (Zarus et al.) — occupational exposure / PVC microplastic exposure and liver cancer risk  Link: https://stacks.cdc.gov/view/cdc/147717 5. “Exploring the link between microplastics and cancer” (Joseph et al., 2025) — discussion of MPs’ persistence, accumulation, and possible roles in carcinogenesis  Link: https://pubs.rsc.org/en/content/articlehtml/2025/em/d5em00232j 6. “Microplastics and Cancer: Your Questions Answered” (Dana-Farber blog overview) — less technical, useful summary of human/animal evidence to date  Link: https://blog.dana-farber.org/insight/2025/03/microplastics-and-cancer-what-you-need-to-know/ 7. “Microplastics in the Human Body: Exposure, Detection, and …” (Dzierżyński et al., 2024) — includes risk estimates for cancer from MP-bound contaminants  Link: https://www.mdpi.com/2072-6694/16/21/3703 8. “Microplastics: an often-overlooked issue in the transition …” (Cheng et al., 2024) — mentions MP exposure promoting proliferation of skin cancer cells, etc.  Link: https://translational-medicine.biomedcentral.com/articles/10.1186/s12967-024-05731-5 9. “Identification and analysis of microplastics in peritumoral and tumor tissues of colorectal cancer” (Pan et al., 2025) — directly detects MPs in human colorectal tumor and peritumoral tissues  Link: https://www.nature.com/articles/s41598-025-98268-6 10. “Investigating the Carcinogenic Potential of Plastic Additives” (Vincoff et al., 2024) — focuses on additives (in plastics) which may mediate carcinogenic risk in plastics including microplastics  Link: https://pubs.acs.org/doi/10.1021/acs.est.3c06840
The tech exists and has for decades and is battle hardened. It is called zero proof knowledge but Centralized power wants nothing to do with it as it is a decentralized technology. It is ok, as we will be forced to move towards decentralized services the more we wade into the new AI/Quantum Age as anything Centralized is a sitting duck for being hacked and hacked often to the point that they become useless.