CD44 and breast cancer: Glycosylation changes on glycoprotein CD44 were studied with 75 FFPE patients’ bladder tumor tissues (34 NMIBC, 41 MIBC), 11 control tissues, and 3 cell lines of BC by a combination of various approaches, glycomics including several types of immunoassays and double staining immunofluorescence, glycoproteomics and transcriptomic, for better and more complex characterization of samples.