Sialyl Lewis x (sLex) and sialyl Lewis a (sLea) glycans are expressed on highly metastatic colon cancer cells. They promote extravasation of cancer cells and tumor angiogenesis via interacting with E-selectin on endothelial cells. Recently, epithelial–mesenchymal transition (EMT) has been noted as a critical phenotypic alteration in metastatic cancer cells.
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