Fucosylation is a common glycosylation type in pancreatic cancer stem cell-like phenotypes. World journal of gastroenterology AIM:To evaluate/isolate cancer stem cells (CSCs) from tissue or cell lines according to various definitions and cell surface markers. METHODS:Lectin microarray analysis was conducted on CSC-like fractions of the human pancreatic cancer cell line Panc1 by establishing anti-cancer drug-resistant cells. Changes in glycan structure of CSC-like cells were also investigated in sphere-forming cells as well as in CSC fractions obtained from overexpression of CD24 and CD44. RESULTS:Several types of fucosylation were increased under these conditions, and the expression of fucosylation regulatory genes such as fucosyltransferases, GDP-fucose synthetic enzymes, and GDP-fucose transporters were dramatically enhanced in CSC-like cells. These changes were significant in gemcitabine-resistant cells and sphere cells of a human pancreatic cancer cell line, Panc1. However, downregulation of cellular fucosylation by knockdown of the GDP-fucose transporter did not alter gemcitabine resistance, indicating that increased cellular fucosylation is a result of CSC-like transformation. CONCLUSION:Fucosylation might be a biomarker of CSC-like cells in pancreatic cancer. 10.3748/wjg.v21.i13.3876