Objective To investigate the expression levels of serum exosomes integrin α5, β5 and β6 and their clinical significance in patients with different stages of colorectal cancer (CRC). Methods The serum samples were collected from 50 patients with CRC admitted in the Affiliated Hospital of Hunan Academy of Traditional Chinese Medicine and Hunan Cancer Hospital from January 2016 to October 2020, and were divided into CRC stage Ⅰ group (n=5), CRC stage Ⅱ group (n=19), CRC stage Ⅲ group (n=14), and CRC stage Ⅳ group (only liver metastasis, n=1...