Molecular analysis reveals a genetic basis for the phenotypic diversity of metaplastic breast carcinomas.

The Journal of Pathology
Felipe C GeyerJorge S Reis-Filho

Abstract

Cancers may be composed of multiple populations of submodal clones sharing the same initiating genetic lesions, followed by the acquisition of divergent genetic hits. Intra-tumour genetic heterogeneity has profound implications for cancer clinical management. To determine the extent of intra-tumour genetic heterogeneity in breast cancers, and whether the morphological diversity of breast cancers is underpinned by divergent genetic aberrations, we analysed the genomic profiles of microdissected, morphologically distinct components of six metaplastic breast carcinomas, tumours characterized by the presence of morphological areas with divergent differentiation. Each morphologically distinct component was separately microdissected and subjected to high-resolution microarray-based comparative genomic hybridization. Each component was also analysed by immunohistochemistry and in situ hybridization. Clonal relationship between the distinct components was tested by TP53 sequencing and human androgen receptor (HUMARA) X-chromosome inactivation assay. In the majority of cases, all morphologically distinct components from each case were clonal and displayed remarkably similar genetic profiles. In two cases, however, morphologically distin...Continue Reading

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