Abstract

Research endeavors originally generated stem cell definitions for the purpose of describing normally sustainable developmental and tissue turnover processes in various species, including humans. The notion of investigating cells that possess a vague capacity of “stamm (phylum)” can be traced back to the late 19th century, mainly concentrating on cells that could produce the germline or the entire blood system. Lately, such undertakings have been recapitulated for oncogenesis, tumor growth, and cancer cell resistance to oncolytic therapies. However, due to the complexity and basic life-origin mechanisms comprising the genetic and epigenetic repertoire of the stemness in every developing or growing cell, presently there are ongoing debates regarding the biological essentials of the stem cell-like tumor initiation cells (ie, cancer stem cells; CSCs). This conceptual analysis focuses on the potential pitfalls of extrapolating that CSCs bear major traits of stemness. We propose a novel nomenclature of Tumor Survival Cells (TSCs) to further define tumor cells behaving like CSCs, based on the ruthless and detrimental features of Cancer Cell Survivology that appears fundamentally different from stem cell biology. Hence, precise academic separation of TSCs from all the stem cell-related labels applied to these unique tumor cells may help to improve scientific reasoning and strategies to decode the desperado-like survival behaviors of TSCs to eventually overcome cancer.

Highlights

  • Ernst Haeckel (1834–1919), a German biologist, physician, naturalist, artist, and philosopher, is considered a pioneer in developmental cell biology research

  • What emerged from our analysis is a fine but definitive line between the authentic stemness biology and the newly defined cancer cell survivology

  • We hereby recommend introducing the term of TSCs (Tumor Survival Cells)

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Summary

Cancer Stem Cells or Tumor Survival Cells?

The notion of investigating cells that possess a vague capacity of ‘‘stamm (phylum)’’ can be traced back to the late 19th century, mainly concentrating on cells that could produce the germline or the entire blood system. Due to the complexity and basic life-origin mechanisms comprising the genetic and epigenetic repertoire of the stemness in every developing or growing cell, presently there are ongoing debates regarding the biological essentials of the stem cell-like tumor initiation cells (ie, cancer stem cells; CSCs). This conceptual analysis focuses on the potential pitfalls of extrapolating that CSCs bear major traits of stemness.

Background
The Evolving Theory of Cancer Stem Cells
CSCs Do Not Possess Authentic Stemness Biology
Cell adhesive interaction and specific TSCs marker
Acquisition and maintenance of pluripotency
Present Definitions of CSCs
CSCs Are Tumor Survival Cells
Summary
Full Text
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