Gastrointestinal Pathology Indian Medical PG Practice Questions and MCQs
Practice Indian Medical PG questions for Gastrointestinal Pathology. These multiple choice questions (MCQs) cover important concepts and help you prepare for your exams.
Gastrointestinal Pathology Indian Medical PG Question 1: Gastric carcinoma is associated with all of the following EXCEPT:
- A. Over expression of C-met
- B. Inactivation of p53
- C. Over expression of C-erb
- D. Activation of RAS (Correct Answer)
Gastrointestinal Pathology Explanation: ***Activation of RAS***
- **RAS mutations** are relatively uncommon in gastric carcinoma compared to other gastrointestinal malignancies. While KRAS mutations can occur in approximately 10-15% of gastric cancers (particularly intestinal type), they are **far less frequent** than in **pancreatic adenocarcinoma** (~90%) or **colorectal carcinoma** (~40%).
- In the context of gastric carcinoma, RAS pathway alterations are **not considered a major oncogenic driver** compared to the other molecular changes listed, making this the **LEAST characteristically associated** alteration.
*Inactivation of p53*
- **Inactivation of the p53 tumor suppressor gene** is one of the most frequent molecular events in gastric carcinoma, occurring in approximately **50-60% of cases**.
- Loss of p53 function leads to genomic instability, uncontrolled cell proliferation, and resistance to apoptosis, contributing significantly to **tumorigenesis** and **poor prognosis**.
*Over expression of C-met*
- **Overexpression of C-MET**, a receptor tyrosine kinase for hepatocyte growth factor (HGF), is commonly observed in gastric carcinoma (30-40% of cases) and is strongly linked to **tumor growth**, **invasion**, and **metastasis**.
- C-MET amplification and overexpression promote cell proliferation, survival, migration, and angiogenesis, making it an important **therapeutic target** in advanced gastric cancer.
*Over expression of C-erb*
- **Overexpression of C-erbB-2 (HER2/neu)** is found in approximately **10-20% of gastric adenocarcinomas**, particularly the intestinal type.
- HER2 amplification or overexpression is a significant **prognostic and predictive biomarker**, and is specifically targeted by **trastuzumab** (Herceptin) therapy in HER2-positive advanced gastric cancer, improving survival outcomes.
Gastrointestinal Pathology Indian Medical PG Question 2: Which of the following statements regarding peptic ulcers are correct?
1. Duodenal ulcers are more common as compared to gastric ulcers.
2. Helicobacter pylori and NSAIDs are most common causative agents.
3. Bleeding is the most common complication associated with posterior duodenal ulcer.
- A. 2 and 3 only
- B. 1, 2 and 3
- C. 1 and 2 only (Correct Answer)
- D. 1 and 3 only
Gastrointestinal Pathology Explanation: ***1 and 2 only***
- **Duodenal ulcers** are significantly more common than gastric ulcers, with a ratio of about 4:1 [1].
- The two primary causes of peptic ulcers are infection with **_Helicobacter pylori_** and the use of **non-steroidal anti-inflammatory drugs (NSAIDs)** [1].
*2 and 3 only*
- While _**H. pylori**_ and **NSAIDs** are indeed the most common causes, the statement incorrectly assumes that bleeding is the most common complication associated with **posterior duodenal ulcers**, when the most common complication of all peptic ulcers is **hemorrhage** but it is more specifically associated with posterior duodenal ulcers due to proximity to the **gastroduodenal artery**.
- Hence, the second and third statements are individually correct, but the first statement which says duodenal ulcers are more common then gastric ulcers is also correct.
*1, 2 and 3*
- While statements 1 and 2 are correct individually, statement 3, which attributes bleeding as the most common complication specifically to posterior duodenal ulcers, is correct because posterior duodenal ulcers are particularly prone to bleeding due to the proximity of the **gastroduodenal artery** [1].
- Thus, all three statements are individually correct, but the combination chosen is redundant.
*1 and 3 only*
- This option is flawed because it omits statement 2, which correctly identifies **_H. pylori_** and **NSAIDs** as the primary causes of peptic ulcers [1].
- Although posterior duodenal ulcers are associated with bleeding, statement 3 is not complete enough without the inclusion of statement 2.
Gastrointestinal Pathology Indian Medical PG Question 3: H. pylori infection is associated with an increased risk of
- A. Proximal gastric cancer
- B. Carcinoma of body and pylorus of stomach (Correct Answer)
- C. Carcinoma of duodenum first part
- D. Carcinoma involving gastroesophageal junction
Gastrointestinal Pathology Explanation: ***Carcinoma of body and pylorus of stomach***
- *H. pylori* infection is a well-established risk factor for **gastric adenocarcinoma**, most commonly affecting the **distal stomach (body and pylorus)** [1].
- Chronic inflammation induced by *H. pylori* leads to atrophy, intestinal metaplasia, dysplasia, and ultimately, carcinoma in these regions [1].
*Proximal gastric cancer*
- **Proximal gastric cancers**, particularly those involving the **cardia**, are less strongly associated with *H. pylori* infection.
- The prevalence of *H. pylori* in cardia gastric cancer is lower compared to distal gastric cancer.
*Carcinoma of duodenum first part*
- **Duodenal carcinoma** is a rare malignancy, and its association with *H. pylori* is not significant [2].
- While *H. pylori* can cause duodenal ulcers, it does not typically lead to cancer in the duodenum [2].
*Carcinoma involving gastroesophageal junction*
- **Gastroesophageal junction (GEJ) adenocarcinoma** has been *inversely* associated with *H. pylori* infection in some studies.
- The development of GEJ cancer is more strongly linked to **gastroesophageal reflux disease (GERD)** and **Barrett's esophagus** [3].
Gastrointestinal Pathology Indian Medical PG Question 4: Which of the following statements about Helicobacter pylori is true?
- A. It is a gram-positive bacterium.
- B. It causes hypergastrinemia.
- C. It is involved in the causation of peptic ulcer disease. (Correct Answer)
- D. All of the options.
Gastrointestinal Pathology Explanation: ***It is involved in the causation of peptic ulcer disease.***
- *Helicobacter pylori* is a major cause of **peptic ulcer disease**, significantly increasing the risk of both gastric and duodenal ulcers [1].
- Its presence leads to chronic inflammation and damage to the gastric and duodenal mucosa, predisposing to ulcer formation [2].
*It is a gram-positive bacterium.*
- *Helicobacter pylori* is a **gram-negative** spiral-shaped bacterium, not gram-positive.
- Its gram staining property is a key characteristic used for its identification in microbiology.
*It causes hypergastrinemia.*
- While *H. pylori* can affect gastrin levels, it typically leads to **hypochlorhydria** and **low gastrin levels** due to inflammation of the gastric antrum, not hypergastrinemia. [Note: Text correction based on evidence] Chronic *H. pylori* infection can lead to an increase in gastrin (hypergastrinaemia) due to depletion of somatostatin from D cells, which stimulates increased acid production [1].
- Chronic *H. pylori* infection can sometimes lead to an increase in gastrin, but this is usually due to reduced somatostatin inhibition rather than direct gastrin stimulation [1].
*All of the options.*
- This option is incorrect because the statement that it is a gram-positive bacterium is false.
- Therefore, not all the listed options are true.
Gastrointestinal Pathology Indian Medical PG Question 5: Which of the following statements accurately describes the morphological features of a peptic ulcer?
- A. Usually multiple
- B. More common in the stomach
- C. Round to oval, sharply punched out defect (Correct Answer)
- D. Size and location are not definitive features to differentiate between benign and malignant ulcers
Gastrointestinal Pathology Explanation: ***Round to oval, sharply punched out defect***
- Peptic ulcers typically present as **round to oval lesions** that have a **sharply defined margin**, which is a characteristic feature.
- They appear as **defects in the gastric or duodenal mucosa**, reflecting the localized destruction of the tissue.
*Usually multiple*
- Peptic ulcers are generally **single** lesions, often found in isolation rather than **multiple** ulcers.
- The presence of multiple ulcers is more typical of **conditions like Zollinger-Ellison syndrome** rather than standard peptic ulcers [1].
*Size and location helps to differentiate between benign and malignant ulcer*
- While size and location can play a role in diagnosis, **endoscopy** and biopsy are more definitive methods for distinguishing between benign and malignant ulcers.
- Peptic ulcers primarily have a **characteristic morphology** that is more relevant than the size and location when initially assessing them.
*More common in the stomach*
- Peptic ulcers are predominantly found in the **duodenum**, making them **more common** than gastric ulcers [2].
- Gastric ulcers do occur, but the overall incidence of **duodenal ulcers** is higher in the context of peptic ulcer disease [1][2].
**References:**
[1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Alimentary System Disease, pp. 353-354.
[2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, pp. 773-774.
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