Clonality assessment and clonal ordering of individual neoplastic crypts shows polyclonality of colorectal adenomas.
BACKGROUND and AIMS: According to the somatic mutation theory, monoclonal colorectal lesions arise from sequential mutations in the progeny of a single stem cell. However, studies in a sex chromosome mixoploid mosaic (XO/XY) patient indicated that colorectal adenomas were polyclonal. We assessed adenoma clonality on an individual crypt basis and completed a genetic dependency analysis in carcinomas-in-adenomas to assess mutation order and timing. METHODS: Polyp samples were analyzed from the ...Expand abstract
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