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Results suggest cancer stem cells with high self-renewal and replication may be prerequisites for reaching larger lethal tumor sizes, while homogeneous tumors reach lethal thresholds faster when small size 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is the central focus of the study on tumor hierarchy?","Question",{"text":63,"@type":64},"The study examines how the depth and structure of tumor hierarchy influence hypertumor progression and related outcomes.","Answer",{"name":66,"@type":61,"acceptedAnswer":67},"How do the authors investigate hypertumor dynamics?",{"text":68,"@type":64},"They develop biologically relevant models that reflect hierarchical structures and align with previously observed state transitions in human breast cancer subpopulations.",{"name":70,"@type":61,"acceptedAnswer":71},"What does the computational analysis suggest about lethal tumor size?",{"text":72,"@type":64},"The results indicate that cancer stem cells with high self-renewal and replication may be necessary to achieve larger lethal tumor sizes, whereas homogeneous cell compositions can reach lethal thresholds more quickly when a small size triggers 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 \nOPEN  \nThe depth of tumor hierarchy and its impact on hypertumor susceptibility  \nJibeom Choi1,2􀀍, Suhyeon Kim1, Sunmi Lee1 & Junpyo Park1􀀍  \nCancer cells, despite their shared origin, could be heterogeneous with respect to their stemness, plasticity, self-renewal, and oncogenicity. Recent findings indicate that a small proportion of the cancer cells oligopolize the capacity to produce diverse cancer subtypes and metastasize to other sites. Analogous to the apical hierarchy observed in adult stem cells, such versatile cancer cells were termed cancer stem cells. Meanwhile, hypertumors that exploit the cooperation of other cancer cells may disrupt the integrity of the tumor, prompting tumor regression. The biology of cancer stem cells and hypertumors has substantial clinical potential, but no study up to date has investigated the effect of cancer hierarchy on hypertumor progression. In this study, we developed biologically relevant models that elucidate the dynamics of hypertumor progression under different hierarchical structures. Our models align with previously observed data from human breast cancer subpopulations capable of state transitions. We tested and compared the progression dynamics of cancer clusters with different characteristics. Considering the trade-off between proliferation and mutation risk, our computational results suggest that existence of the cancer stem cells with high self-renewal and replication could bethe prerequisite for attaining larger cancer size. In contrast, if a small cancer size is sufficient to induce lethality, a tumor composed of homogeneous cells would take less time to reach such a threshold size. Consequently, the hierarchical structure of cancer that reaches a lethal size may vary across species, representing a relevant mechanism of Peto’s paradox. The formulations presented in this study link the less attended aspects of cancer which would provide integrative insights for therapeutic strategies.  \nMankind still being afflicted by cancer, facets of cancer that have gained minor clinical attention could be the cornerstone for developing transformative therapeutic applications. One such facet is the existence of the cancer hierarchy. Lines of empirical evidence suggest that not all cells in a tumor have the capacity to form another cluster of tumors (tumorigenicity) . Comparable to the stem cells of normal tissue, a small subpopulation in a tumor endowed with tumorigenicity and self-renewal can generate diverse types of cancer cells, referred to as cancer stem cells (CSCs)1–4. At least in some cancers, CSCs produce identical CSCs or other cancer cells that lack tumorigenicity called bulk tumor cells or non-CSCs1. The distinction between CSCs and bulk tumor cells established the conceptualization of hierarchical organization in cancer (cancer stem cell model), rather than an aggregation of homogeneous mutated cells.  \nThe CSC has significant clinical implications as a small number of the CSCs that are not eliminated by therapy would elicit relapse with a poorer prognosis (minimal residual disease)5. Moreover, it is commonly accepted that CSCs are more resilient to conventional therapies, presumably due to their dormancy3. Though selective elimination of CSCs will confer improved prognosis, off-target effects of such therapy may have detrimental effects on normal stem cells as both types of cells have multiple traits in common2.  \nHowever, there is a wide range of disputes concerning the technical pitfalls of experiments designed to verify the existence and characteristics of CSCs2,3. The ordinary procedure to elucidate CSCs is the xenograft assay whereby cancer cells of the same type are engrafted to immunosuppressed animals. Although a specific typeof cancer cells sorted by surface markers can form a tumor or induce leukemia in immunosuppressed animals, this does not fully validate the hierarchy of cancer. Incompatibi","cbCaiabbb6WImLyl","https://ap.wps.com/l/cbCaiabbb6WImLyl","pdf",5715218,16,"English","# Introduction\n## Cancer hierarchy and cancer stem cells\n## Clinical implications and experimental controversies\n## Evidence for and against hierarchy","[{\"question\":\"What is the central focus of the study on tumor hierarchy?\",\"answer\":\"The study examines how the depth and structure of tumor hierarchy influence hypertumor progression and related outcomes.\"},{\"question\":\"How do the authors investigate hypertumor dynamics?\",\"answer\":\"They develop biologically relevant models that reflect hierarchical structures and align with previously observed state transitions in human breast cancer subpopulations.\"},{\"question\":\"What does the computational analysis suggest about lethal tumor size?\",\"answer\":\"The results indicate that cancer stem cells with high self-renewal and replication may be necessary to achieve larger lethal tumor sizes, whereas homogeneous cell compositions can reach lethal thresholds more quickly when a small size triggers lethality.\"}]","The depth of tumor hierarchy and its impact on hypertumor susceptibility | PDF",1790188467]