Intestinal Metaplasia and Gastric Cancer Risk

Definition and Progression

Intestinal metaplasia in the gastric antral region significantly increases the risk of developing gastric cancer, with a cumulative risk of approximately 1.6% at 10 years, according to the American Gastroenterological Association 1, 2
Intestinal metaplasia is the most frequently diagnosed histopathologic manifestation of atrophic gastritis, characterized by the replacement of normal gastric epithelium with intestinal-type epithelium 3

Incomplete (colonic-type) intestinal metaplasia carries a 3-fold higher risk of developing gastric cancer compared to complete (small intestinal-type) intestinal metaplasia, as reported by the American Gastroenterological Association 1, 2
Extensive intestinal metaplasia involving both antrum and gastric body has approximately 2-fold higher risk of progression compared to limited intestinal metaplasia confined to the antrum/incisura, according to the American Gastroenterological Association 1, 2
Having a first-degree relative with gastric cancer increases the risk of developing gastric cancer 4.5-fold in patients with intestinal metaplasia, as noted by the American Gastroenterological Association 1, 2

The American Gastroenterological Association recommends H. pylori testing and eradication for all patients with gastric intestinal metaplasia (strong recommendation, moderate quality evidence) 4, 5
The American Gastroenterological Association suggests that routine endoscopic surveillance is not recommended for all patients with gastric intestinal metaplasia (conditional recommendation, very low quality evidence), but may be appropriate for high-risk individuals based on shared decision-making 4, 5
Patients with incomplete intestinal metaplasia, extensive intestinal metaplasia, or family history of gastric cancer may benefit from surveillance, as recommended by the American Gastroenterological Association 4, 5

The presence of intestinal metaplasia on gastric histology almost invariably implies the diagnosis of atrophic gastritis, as noted by the American Gastroenterological Association 7
Proper specimen collection is crucial, with biopsies from antrum/incisura and corpus placed in separate labeled specimen jars to allow assessment of the anatomic extent of intestinal metaplasia, according to the American Gastroenterological Association 3