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Angiogenesis

Tumorigenesis and the angiogenic switch

Key Points

  • Tumour heterogeneity leads to heterogeneity in the tumour vasculature. Just as there are multiple phenotypes for any given tumour type, so can there be multiple phenotypes of the tumour angiogenic process.

  • The onset of angiogenesis, or the 'angiogenic switch', is a discrete step that can occur at any stage of tumour progression. It depends on the type of tumour and its microenvironment.

  • Tumour angiogenesis differs significantly from physiological angiogenesis. Differences include aberrant vascular structure, altered endothelial-cell–pericyte interactions, abnormal blood flow, increased permeability and delayed maturation.

  • The abnormal features of the tumour vasculature are believed to result from the disproportionate expression of angiogenic cytokines and inhibitors. Expression of these varies from tumour to tumour.

  • Tumour hypoxia complicates the angiogenic response, depending on the status of p53, which can regulate key angiogenic cytokines and inhibitors.

  • The angiogenic activity of a tumour does not necessarily correlate with tumour aggressiveness. Nonetheless, it can be a prognostic factor for certain tumour types.

  • Anti-angiogenic agents can be used not only for the treatment of cancer, but also for the prevention of cancer recurrence or metastasis. Given the heterogeneity of tumour and blood-vessel growth, a multidrug approach that targets various factors might be more successful than monotherapy in restraining cancer growth.

Abstract

It has become evident that we cannot understand tumour growth without considering components of the stromal microenvironment, such as the vasculature. At the same time, the tumour phenotype determines the nature of the tumour vasculature. Much research is now devoted to determining the impact of angiogenesis on tumour development and progression, and the reciprocal influences of tumour products on the microvasculature. A more detailed understanding of the complex parameters that govern the interactions between the tumour and vascular compartments will help to improve anti-angiogenic strategies — not only for cancer treatment, but also for preventing recurrence.

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Figure 1: The angiogenic balance.
Figure 2: The classical angiogenic switch.
Figure 3: New blood-vessel formation.
Figure 4: Blood vessel co-option precedes angiogenesis in astrocytoma progression.

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Acknowledgements

We thank T. Tihan (University of California San Francisco) for advising us on brain-tumour pathology.

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Correspondence to Gabriele Bergers.

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DATABASES

Cancer.gov

astrocytoma

breast cancer

cervical cancer

colon cancer

glioblastoma

lung cancer

melanoma

prostate cancer

renal-cell carcinoma

GenBank

E1A

E6

E7

LocusLink

ANG1

ANG2

BCL2

BCL-XL

endostatin

FGF

HIF-1α

MDM2

MMP9

MYC

p53

PDGF

PDGFR

PlGF

RAS

RB

TERT

TIE2

TNF-α

TSP1

VEGFA

VEGFC

VEGFD

VEGFR1

VEGFR2

OMIM

familial adenomatous polyposis

FURTHER INFORMATION

National Cancer Institute — Understanding angiogenesis

Glossary

PERIVASCULAR CELLS

Mural cells that surround the endothelium. These cells are related to the vascular smooth-muscle lineage and share many markers with these cells.

ENDOTHELIAL PRECURSOR CELLS

Undifferentiated cells in the adult bone marrow that can travel through the blood to sites of ongoing angiogenesis, and differentiate into mature endothelial cells. They have recently been implicated in tumour angiogenesis. These cells are identified by co-expression of haematopoietic stem-cell markers (CD34 and AC133), and vascular endothelial-cell markers (VEGFR2 and TIE2).

PERICYTES

Cells that are related to vascular smooth muscle. These cells are adjacent to and surrounding the endothelium, share a common basement membrane with the endothelium, and have gap-junction connections with the endothelial cells. Whether these cells are multipotent, with the ability to differentiate into either vascular smooth muscle or even endothelium, is still unclear.

MURAL CELLS

Cells of the blood-vessel wall.

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Bergers, G., Benjamin, L. Tumorigenesis and the angiogenic switch. Nat Rev Cancer 3, 401–410 (2003). https://doi.org/10.1038/nrc1093

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