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2015 ; 9
(4
): 265-76
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Intratumoral heterogeneity: Clonal cooperation in epithelial-to-mesenchymal
transition and metastasis
#MMPMID25482627
Neelakantan D
; Drasin DJ
; Ford HL
Cell Adh Migr
2015[]; 9
(4
): 265-76
PMID25482627
show ga
Although phenotypic intratumoral heterogeneity was first described many decades
ago, the advent of next-generation sequencing has provided conclusive evidence
that in addition to phenotypic diversity, significant genotypic diversity exists
within tumors. Tumor heterogeneity likely arises both from clonal expansions, as
well as from differentiation hierarchies existent in the tumor, such as that
established by cancer stem cells (CSCs) and non-CSCs. These differentiation
hierarchies may arise due to genetic mutations, epigenetic alterations, or
microenvironmental influences. An additional differentiation hierarchy within
epithelial tumors may arise when only a few tumor cells trans-differentiate into
mesenchymal-like cells, a process known as epithelial-to-mesenchymal transition
(EMT). Again, this process can be influenced by both genetic and non-genetic
factors. In this review we discuss the evidence for clonal interaction and
cooperation for tumor maintenance and progression, particularly with respect to
EMT, and further address the far-reaching effects that tumor heterogeneity may
have on cancer therapy.