Journal
VIRCHOWS ARCHIV
Volume 468, Issue 4, Pages 397-408Publisher
SPRINGER
DOI: 10.1007/s00428-015-1886-5
Keywords
Colorectal cancer; Budding; Epithelial-mesenchymal transition; Metastasis
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Budding is a process during which individual or small clusters of up to five tumour cells detach from the main tumour mass and invade into the surrounding stroma. In colorectal cancer, this feature is observed in 20-40 % of cases and is associated with lymphovascular invasion, lymph node and distant metastases, and poor prognosis. A variety of scoring systems for budding have been proposed but so far a gold standard is lacking, hampering implementation of a budding score in guidelines for pathological examination of colorectal cancer. Furthermore, little is known about the mechanisms which cause tumour cells to detach from the main tumour mass and obtain increased invasive potential. In this review, we present an overview of tumour budding including its definition, scoring systems, prognostic relevance and biological mechanisms involved.
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