A new review in Cellular & Molecular Biology Letters argues that the dedifferentiation of mature tumor cells into cancer stem cells (CSCs) should be regarded as a major, non-genetic engine of tumor evolution. Author Amancio Carnero synthesizes recent cancer research to propose that tumors are shaped not only by accumulating mutations but also by reversible shifts in cell state that let differentiated cancer cells regain stem-like properties.
The review’s central claim is that CSCs should not be viewed as a fixed population descended exclusively from normal stem cells. Instead, the evidence it surveys points to CSCs as a dynamic cellular state that individual tumor cells can acquire or lose through reversible phenotypic transitions. When differentiated tumor cells dedifferentiate, they can replenish the CSC pool, increasing heterogeneity and helping tumors adapt to pressures such as treatment.
According to the review, these transitions are governed by complex regulatory networks rather than a single switch. Transcriptional reprogramming, epigenetic modifications, developmental signaling pathways, and signals from the tumor microenvironment all contribute to driving mature tumor cells back toward a stem-like state. Epithelial–mesenchymal transition and epigenetic reprogramming are highlighted as particularly important mechanisms linking cell plasticity to tumor progression.
Supporting evidence comes from modern observational technologies. The review examines findings from single-cell transcriptomics and lineage-tracing studies that demonstrate dynamic cell state transitions occurring within tumors, providing a empirical basis for treating plasticity as a real feature of cancer biology rather than a purely theoretical model.
Conceptually, the author integrates the classical clonal evolution model with the cancer stem cell framework. In the traditional view, tumor diversity arises mainly from genetic alterations selected over time; in the stem cell view, a subset of cells drives regrowth. The proposed synthesis holds that dedifferentiation connects the two, supplying a non-genetic route by which tumors generate diversity and evolve alongside genetic change.
The review also draws out clinical implications. Because CSC plasticity is linked to metastasis and therapy resistance, the author argues that targeting the mechanisms of dedifferentiation could inform future therapeutic strategies aimed at intervening in tumor evolution itself, rather than only at genetically defined tumor subclones.
As a review article, the piece synthesizes and interprets existing literature rather than presenting new experimental data, and its conclusions about therapeutic strategies are framed as future directions for the field. Even so, its core message is a significant reframing: tumor evolution may be driven as much by the flexible identities of cancer cells as by the mutations they carry.
Subject of Research: Cancer stem cell plasticity and tumor evolution
Article Title: Dedifferentiation of mature tumor cells into cancer stem cells as a driver of tumor evolution
Article References: Carnero, A. (2026). Dedifferentiation of mature tumor cells into cancer stem cells as a driver of tumor evolution. Cellular & Molecular Biology Letters. https://doi.org/10.1186/s11658-026-01014-7
Image Credits: AI Generated
DOI: 10.1186/s11658-026-01014-7
Keywords: cancer stem cells, dedifferentiation, tumor evolution, cell plasticity, epigenetic reprogramming, epithelial-mesenchymal transition, tumor microenvironment, single-cell transcriptomics, lineage tracing, therapy resistance, metastasis, mature
News Source: Nathaniel Bowman. (October 30, 2026). Tumor cells may revert to stem-like states, review argues. Scienmag.
