Abstract
Squamous cell carcinomas (SCCs) are among the most prevalent human cancers. SCC comprises a wide range of tumours originated from diverse anatomical locations that share common genetic mutations and expression of squamous differentiation markers. SCCs arise from squamous and non-squamous epithelial tissues. Here, we discuss the different studies in which the cell of origin of SCCs has been uncovered by expressing oncogenes and/or deleting tumour suppressor genes in the different cell lineages that compose these epithelia. We present evidence showing that the squamous differentiation phenotype of the tumour depends on the type of mutated oncogene and the cell of origin, which dictate the competence of the cells to initiate SCC formation, as well as on the aggressiveness and invasive properties of these tumours.
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