In colorectal cancer group, 218 and 235 patients were positive in Ig G (+) and Cag A (+), the rate was 50.9% and 54.9%, and in the control group, 93 and 109 patients were positive in Ig G (+) and Cag A (+), and the rate was 44.9% and 52.7%, respectively. Here, GAN is linked to colorectal cancer.