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Exposomal determinants of non-genetic plasticity in tumor initiation
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The classical view of cancer as a genetically driven disease has been challenged by recent findings of oncogenic mutations in phenotypically healthy tissues, refocusing attention on non-genetic mechanisms of tumor initiation. In this context, gene–environment interactions take the stage, with recent studies showing how they unleash and redirect cellular and tissue plasticity towards protumorigenic states in response to the exposome, the ensemble of environmental factors impinging on tissue homeostasis. We conceptualize tumor-initiating plasticity as a phenotype-transforming force acting at three levels: cell-intrinsic, focusing on mutant epithelial cells’ responses to environmental variation; reprogramming of non-neoplastic cells of the host, leading to protumor micro- and macroenvironments; and microbiome ecosystem dynamics. This perspective highlights cell, tissue, and organismal plasticity mechanisms underlying tumor initiation that are shaped by the exposome, and how their functional investigation may provide new opportunities to prevent, detect, and intercept cancer-promoting plasticity.
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CARRA, Davide, et al. Exposomal determinants of non-genetic plasticity in tumor initiation. Trends in Cancer. 2025. Vol. 11, num. 4, pags. 295-308. ISSN 2405-8033. [consulted: 19 of July of 2026]. Available at: https://hdl.handle.net/2445/229406