CGA and irritable bowel syndrome: Our result revealed a non-significant difference in gastric CgA cell density between IBS and control groups, both in the antrum (SMD = 0.82, 95% CI: -2.76, 4.40, P = 0.65) and corpus parts (SMD = 1.03, 95% CI: -4.32, 6.38, P = 0.71).