Variability in the Solid Cancer Cell Population and Its Consequences for Cancer Diagnostics and Treatment

Česká verzia

Authors: Brychtová Veronika; Valík Dalibor; Vojtěšek Bořivoj
Authors place of work: Regionální centrum aplikované molekulární onkologie, Masarykův onkologický ústav, Brno
Published in the journal: Klin Onkol 2018; 31(Supplementum 2): 5-13
Category: Review
doi: https://doi.org/10.14735/amko20182S5

Summary

Background:

Cancer develops as a result of somatic mutations and evolutionary processes with a Darwinian character. Tumors evolve by dynamic clonal expansion and selection to form genetically diverse cell subpopulations adapted to different tumor microenvironmental conditions. Within cancer cells, the genome is shaped by various selective pressures. Cancer evolution often follows a branched trajectory with divergent subclones evolving simultaneously. Clonal diversity within the same tumor results in genetic, epigenetic and phenotypic variability in tumor mass, which represents a major obstacle for the development of efficient diagnostics and personalized treatment. Advances in sequencing techniques have enabled a better understanding of the growth, progression and response to cancer treatment in heterogeneous cancers. Concurrently, understanding the mechanisms involved and monitoring changes in cancer clones during disease progression may improve the efficiency of cancer therapy.

Aim:

In this review, we summarize available data on intratumor heterogeneity. We show how intratumor heterogeneity, arising from clonal diversity, manifests itself at various levels, including at the genetic, epigenetic, and protein levels. We describe how phylogenetics, a powerful systems biology approach, can help trace clonal evolution during cancer progression and metastasis formation. We also highlight the main problems caused by intratumor heterogeneity, which hinders the development of novel diagnostics and therapies.

Key words:

cancer evolution – intratumor heterogeneity – cancer phylogenetics – clonal evolution

The work was supported by the project MEYS – NPS I – LO1413

The authors declare they have no potential conflicts of interest concerning drugs, products, or services used in the study.

The Editorial Board declares that the manuscript met the ICMJE recommendation for biomedical papers.

Accepted: 8. 8. 2018

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