CD44 and cancer: In fact, most studies concerning CRC have been exclusively conducted on cancer cell lines, leading so far to the identification of a limited number of glycoproteins such as CD44 [37], carcinoembryonic antigen [38], podocalyxin‐like protein [39], lysosomal membrane glycoprotein‐1 and 2 [32], and several types of integrins [26].