## Histological Classification of Gastric Carcinoma **Key Point:** The intestinal type (adenocarcinoma) accounts for approximately 50–70% of all gastric cancers globally, making it the most common histological variant. ### Lauren Classification The Lauren classification divides gastric adenocarcinomas into two main types: | Feature | Intestinal Type | Diffuse Type | | --- | --- | --- | | **Frequency** | 50–70% | 20–30% | | **Histology** | Well-differentiated glandular structures; resembles colonic adenocarcinoma | Poorly cohesive cells; signet ring cells; no gland formation | | **Growth pattern** | Cohesive, mass-forming | Infiltrative, diffuse | | **Associated factors** | H. pylori, chronic gastritis, intestinal metaplasia, older age | Hereditary diffuse gastric cancer (CDH1 mutation), younger age | | **Prognosis** | Relatively better | Worse; often advanced at diagnosis | | **Geographic variation** | More common in high-incidence areas (East Asia, Latin America) | More common in low-incidence areas (Western countries) | **High-Yield:** Intestinal-type gastric cancer arises through the Correa cascade: chronic H. pylori infection → chronic atrophic gastritis → intestinal metaplasia → dysplasia → adenocarcinoma. This sequence is well-established and accounts for the predominance of intestinal-type tumors in endemic regions. **Clinical Pearl:** Diffuse-type gastric cancer (signet ring cell) is associated with worse prognosis because it is often diagnosed at an advanced stage (linitis plastica) and lacks a discrete mass that would prompt earlier detection. **Mnemonic:** **INTESTINAL = Incidence (most common), Intestinal metaplasia (precursor), H. pylori (main driver)** ### Epidemiological Context In India and other high-incidence countries, intestinal-type adenocarcinoma remains the predominant form due to high prevalence of H. pylori infection and chronic gastritis. The diffuse type, though less common globally, carries a poorer prognosis and is often associated with hereditary syndromes (hereditary diffuse gastric cancer).
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