Regarding the pathological features and epidemiology of gastric carcinoma, all of the following are TRUE EXCEPT:

## Gastric Carcinoma: Lauren Classification & Prognosis ### Correct Answer Analysis **Diffuse type gastric carcinoma presents at a LATER stage with WORSE prognosis**, not earlier stage with better prognosis. This is a critical distinction in gastric cancer pathology. ### Lauren Classification | Feature | Intestinal Type | Diffuse Type | |---------|-----------------|---------------| | **Histology** | Well-formed glands, cohesive cells | Scattered individual cells, signet rings | | **Stage at Presentation** | Earlier (localized) | Later (advanced, infiltrative) | | **Prognosis** | Relatively better | Worse | | **Risk Factors** | H. pylori, chronic atrophic gastritis, intestinal metaplasia | Genetic predisposition, CDH1 mutations (hereditary diffuse) | | **Progression** | Correa cascade (chronic gastritis → atrophy → metaplasia → dysplasia → carcinoma) | De novo development, no clear precursor | | **Common Sites** | Antrum, lesser curve | Fundus, greater curve, diffuse involvement | ### Key Pathological Points **Key Point:** Intestinal-type adenocarcinoma follows the **Correa cascade** — a well-established multi-step progression from chronic H. pylori-induced atrophic gastritis through intestinal metaplasia and dysplasia to invasive carcinoma [cite:Robbins 10e Ch 17]. **Key Point:** Diffuse-type carcinoma, particularly signet ring cell variant, is characterized by loss of E-cadherin (CDH1 gene mutations) leading to poor cell-cell adhesion, deep infiltration, and advanced stage at diagnosis. **High-Yield:** Signet ring cell carcinoma is a **diffuse-type variant** — cells lack cohesion, infiltrate deeply into the submucosa and muscularis, and have the worst prognosis among gastric adenocarcinomas (5-year survival <10%). **Clinical Pearl:** Diffuse-type cancers are often detected late because they lack a discrete mass and present with linitis plastica ("leather bottle stomach") — diffuse wall thickening with poor distensibility. ### Why the Distractors Are Correct - **Option 0 (Intestinal type + chronic atrophic gastritis):** TRUE — the Correa cascade is the established pathogenic pathway. - **Option 2 (H. pylori + intestinal type):** TRUE — H. pylori is a Class 1 carcinogen and the strongest risk factor for intestinal-type gastric cancer. - **Option 3 (Signet ring + diffuse type + poor prognosis):** TRUE — signet ring cell carcinoma is a diffuse-type variant with the worst outcomes.