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From complexity to clarity: unravelling tumor heterogeneity through the lens of tumor microenvironment for innovative cancer therapy

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Abstract

Despite the tremendous clinical successes recorded in the landscape of cancer therapy, tumor heterogeneity remains a formidable challenge to successful cancer treatment. In recent years, the emergence of high-throughput technologies has advanced our understanding of the variables influencing tumor heterogeneity beyond intrinsic tumor characteristics. Emerging knowledge shows that drivers of tumor heterogeneity are not only intrinsic to cancer cells but can also emanate from their microenvironment, which significantly favors tumor progression and impairs therapeutic response. Although much has been explored to understand the fundamentals of the influence of innate tumor factors on cancer diversity, the roles of the tumor microenvironment (TME) are often undervalued. It is therefore imperative that a clear understanding of the interactions between the TME and other tumor intrinsic factors underlying the plastic molecular behaviors of cancers be identified to develop patient-specific treatment strategies. This review highlights the roles of the TME as an emerging factor in tumor heterogeneity. More particularly, we discuss the role of the TME in the context of tumor heterogeneity and explore the cutting-edge diagnostic and therapeutic approaches that could be used to resolve this recurring clinical conundrum. We conclude by speculating on exciting research questions that can advance our understanding of tumor heterogeneity with the goal of developing customized therapeutic solutions.

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Abbreviations

TME:

Tumor microenvironment

TAM:

Tumor-associated macrophages

CAF:

Cancer-associated macrophages.

ITH:

Intratumor heterogeneity

ECM:

Extracellular matrix

CSCs:

Cancer stem cells

Hh:

Hedgehog

HIF:

Hypoxia-inducible factor

P4HA:

Prolyl 4-hydroxylase

LOX:

Lysyl oxidase

LOXL:

Lysyl oxidase-like proteins

PLOD:

Procollagen-lysine, 2-oxoglutarate 5-dioxygenase

ITGA:

Integrin subunit alpha

FN:

Fibronectin

MDR:

Multidrug resistance

CIN:

Chromosomal instability

MSI:

Microsatellite instability

EMT:

Epithelial–mesenchymal transition

MMP:

Matrix metalloproteinase

PDGF:

Platelet-derived growth factor

PI3K:

Phosphatidylinositol 3-kinase

MDSC:

Myeloid-derived suppressor cells

TNF-α:

Tumor necrosis factor α

VEGF:

Vascular endothelial growth factors

CCL2:

Chemokine C–C motif ligand 2

TEC:

Tumor endothelial cells

CTCs:

Circulating tumor cells

ADC:

Antibody‒drug conjugates

ICI:

Immune checkpoint inhibitors

ACT:

Adoptive cell therapy

TIL:

Tumor-infiltrating lymphocytes

tgTCR:

Transgenic T-cell receptor

CAR T:

Chimeric antigen receptor-modified T cells

Flt3L:

Fms-like tyrosine kinase 3 ligands

PSCA:

Prostate stem cell antigen

COL4A1:

Collagen type IV alpha 1

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Acknowledgements

All figures were created with Biorender.com.

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IOB conceived the project; SOI and KAA wrote the manuscript and designed the figures. All authors revised the manuscript, read and approved the final draft.

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Correspondence to Sikiru O. Imodoye or Ibrahim O. Bello.

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Imodoye, S.O., Adedokun, K.A. & Bello, I.O. From complexity to clarity: unravelling tumor heterogeneity through the lens of tumor microenvironment for innovative cancer therapy. Histochem Cell Biol 161, 299–323 (2024). https://doi.org/10.1007/s00418-023-02258-6

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  • DOI: https://doi.org/10.1007/s00418-023-02258-6

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