Molecular Pathology — MCQs

Molecular Pathology Indian Medical PG Practice Questions and MCQs

Question 101: Chromosomal instability syndrome is

A. Fanconi syndrome
B. Ataxia Telangectasia
C. Bloom syndrome
D. All of the above (Correct Answer)

Explanation: **Explanation:** **Chromosomal Instability Syndromes** are a group of inherited disorders characterized by defects in **DNA repair mechanisms** [1]. These defects lead to a high frequency of chromosomal breakage, rearrangements, and mutations, which significantly increase the individual's predisposition to various malignancies. 1. **Fanconi Anemia (Option A):** This is an autosomal recessive disorder caused by a defect in the repair of **DNA interstrand cross-links**. It presents with bone marrow failure (aplastic anemia), thumb/radius anomalies, and a high risk of AML and squamous cell carcinomas [2]. (Note: Do not confuse this with *Fanconi Syndrome*, which is a renal proximal tubule defect). 2. **Ataxia-Telangiectasia (Option B):** Caused by a mutation in the **ATM gene** (on chromosome 11), which is responsible for sensing double-stranded DNA breaks. Clinical features include cerebellar ataxia, oculocutaneous telangiectasia, and immunodeficiency [2]. 3. **Bloom Syndrome (Option C):** Caused by a mutation in the **BLM gene**, which encodes **DNA Helicase**. It is characterized by "sister chromatid exchanges," short stature, and a butterfly-shaped photosensitive rash [2]. Since all three conditions are classic examples of defects in DNA maintenance and repair leading to chromosomal fragility, **Option D (All of the above)** is the correct answer. **High-Yield Clinical Pearls for NEET-PG:** * **Xeroderma Pigmentosum:** Another key instability syndrome caused by a defect in **Nucleotide Excision Repair (NER)**, leading to extreme sensitivity to UV light [2]. * **HNPCC (Lynch Syndrome):** Caused by a defect in **Mismatch Repair (MMR)** genes (*MSH2, MLH1*), leading to microsatellite instability. * **BRCA 1/2 Mutations:** Lead to defects in **Homologous Recombination** repair, increasing the risk of breast and ovarian cancers. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. (Basic Pathology) introduces the student to key general principles of pathology, both as a medical science and as a clinical activity with a vital role in patient care. Part 2 (Disease Mechanisms) provides fundamental knowledge about the cellular and molecular processes involved in diseases, providing the rationale for their treatment. Part 3 (Systematic Pathology) deals in detail with specific diseases, with emphasis on the clinically important aspects., pp. 226-227. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, pp. 322-323.

Question 102: Stellate granuloma is found in which condition?

A. Cat scratch disease (Correct Answer)
B. Leprosy
C. Coccidomycosis
D. Histoplasmosis

Explanation: **Explanation:** **Cat scratch disease (CSD)**, caused by the Gram-negative bacterium *Bartonella henselae*, is the classic condition associated with **stellate granulomas**. Pathologically, these are characterized by central irregular (star-shaped) areas of **suppurative necrosis** (containing neutrophils) surrounded by a rim of palisading epithelioid histiocytes and lymphocytes. This unique combination of granulomatous and suppurative inflammation is a hallmark of CSD, typically seen in the regional lymph nodes draining the site of a cat scratch or bite. **Analysis of Incorrect Options:** * **Leprosy:** Characterized by non-caseating granulomas (Tuberculoid) or diffuse histiocytic infiltration without well-formed granulomas (Lepromatous). Stellate morphology is not seen. * **Coccidioidomycosis:** Typically presents with granulomas containing thick-walled **spherules** filled with endospores. While it can cause suppuration, it does not form the characteristic stellate pattern. * **Histoplasmosis:** Features granulomas containing small, intracellular yeast cells (2-4 µm) with a "pseudo-capsule," often found within macrophages. **High-Yield Clinical Pearls for NEET-PG:** * **Differential Diagnosis of Stellate Granulomas:** Apart from Cat scratch disease, stellate granulomas are also seen in **Lymphogranuloma Venereum (LGV)** and occasionally in **Tularemia**. * **Warthin-Starry Stain:** This silver stain is the gold standard for visualizing *Bartonella henselae* in tissue sections. * **Clinical Presentation:** CSD usually presents as painful regional lymphadenopathy (most commonly axillary or cervical) in a child or young adult following contact with a kitten.

Question 103: Which of the following statements regarding fluorescence in situ hybridization (FISH) is false?

A. FISH uses DNA probes that recognize sequences specific to particular chromosomal regions.
B. In the process, clones are labeled with fluorescent dyes and applied to the metaphase of the cell cycle. (Correct Answer)
C. Multiple chromosomes can be detected simultaneously by introducing spectral karyotyping.
D. FISH can also be performed on prenatal samples.

Explanation: ### Explanation **Why Option B is the correct (False) statement:** The statement is false because FISH is **not restricted** to the metaphase of the cell cycle. While FISH can be performed on metaphase chromosomes (which provides high resolution for structural abnormalities) [1], one of its greatest clinical advantages is that it can be performed on **interphase nuclei**. This allows for rapid diagnosis because it bypasses the need for time-consuming cell cultures required to arrest cells in metaphase. **Analysis of other options:** * **Option A:** This is true. FISH utilizes fluorescently labeled DNA probes (e.g., centromeric, telomeric, or locus-specific) that hybridize to complementary sequences on the target chromosome [3]. * **Option C:** This is true. **Spectral Karyotyping (SKY)** or Multiplex-FISH (M-FISH) uses a combination of five different fluorochromes to "paint" all 24 human chromosomes in different colors simultaneously, making it ideal for identifying complex translocations. * **Option D:** This is true. FISH is routinely used on prenatal samples (amniotic fluid or chorionic villus sampling) for the rapid detection of common aneuploidies like Trisomy 21, 18, and 13. **Clinical Pearls for NEET-PG:** * **Resolution:** FISH has a much higher resolution (approx. 100kb–1Mb) than traditional G-banding karyotyping (approx. 5Mb) [1]. * **Common Applications:** * **HER2/neu** amplification in breast cancer (Gold standard) [3]. * **BCR-ABL** translocation in CML [2]. * Microdeletion syndromes (e.g., **DiGeorge Syndrome** - 22q11.2). * **Limitation:** FISH cannot detect small point mutations or very small insertions/deletions; for those, DNA sequencing or PCR is required [2]. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. (Basic Pathology) introduces the student to key general principles of pathology, both as a medical science and as a clinical activity with a vital role in patient care. Part 2 (Disease Mechanisms) provides fundamental knowledge about the cellular and molecular processes involved in diseases, providing the rationale for their treatment. Part 3 (Systematic Pathology) deals in detail with specific diseases, with emphasis on the clinically important aspects., pp. 54-55. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Genetic Disorders, pp. 185-186. [3] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. (Basic Pathology) introduces the student to key general principles of pathology, both as a medical science and as a clinical activity with a vital role in patient care. Part 2 (Disease Mechanisms) provides fundamental knowledge about the cellular and molecular processes involved in diseases, providing the rationale for their treatment. Part 3 (Systematic Pathology) deals in detail with specific diseases, with emphasis on the clinically important aspects., pp. 256-257.

Question 104: A tumor that is negative for CK7 and CK20 is most likely which of the following?

A. Prostate carcinoma (Correct Answer)
B. Colon carcinoma
C. Urothelial carcinoma
D. Mesothelioma

Explanation: In immunohistochemistry (IHC), the combination of **Cytokeratin 7 (CK7)** and **Cytokeratin 20 (CK20)** is a fundamental diagnostic algorithm used to determine the primary site of an unknown metastatic tumor. ### **Explanation of the Correct Answer** **A. Prostate Carcinoma:** Most prostate adenocarcinomas are characteristically **CK7 negative and CK20 negative** [1]. This "double negative" profile is a high-yield diagnostic marker. To confirm prostate origin, pathologists typically use more specific markers like **PSA (Prostate Specific Antigen)** or **PSMA** [1]. ### **Analysis of Incorrect Options** * **B. Colon Carcinoma:** Classically follows a **CK7– / CK20+** pattern. This is the "signature" profile for colorectal adenocarcinoma. * **C. Urothelial Carcinoma:** Typically shows a **CK7+ / CK20+** (double positive) pattern. This helps differentiate it from prostate cancer, which often presents with similar clinical symptoms. * **D. Mesothelioma:** Characteristically **CK7+ / CK20–**. It also expresses specific markers like Calretinin and WT-1. ### **High-Yield Clinical Pearls for NEET-PG** * **CK7+/CK20– Profile:** Seen in Lung (adenocarcinoma), Breast, Thyroid, and Endometrial cancers. * **CK7–/CK20+ Profile:** Highly suggestive of Colorectal cancer and Merkel cell carcinoma. * **CK7+/CK20+ Profile:** Seen in Urothelial (Bladder), Pancreatic, and Gastric cancers. * **CK7–/CK20– Profile:** Seen in **Prostate cancer**, Renal Cell Carcinoma (RCC), and Hepatocellular Carcinoma (HCC) [1]. * **Memory Aid:** "Prostate and Kidney (RCC) are 'double negative' (7-/20-), while the Bladder (Urothelial) is 'double positive' (7+/20+)." **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Lower Urinary Tract and Male Genital System, pp. 989-994.

Question 105: Distinction between a poorly differentiated carcinoma and a lymphoma can be made by immunoperoxidase staining of the tumour tissue with antibodies directed against which of the following?

A. Desmin
B. Myoglobin
C. Vimentin
D. Cytokeratin (Correct Answer)

Explanation: **Explanation:** In surgical pathology, Immunohistochemistry (IHC) is the gold standard for identifying the lineage of poorly differentiated tumors. The distinction between carcinoma and lymphoma relies on identifying cell-specific intermediate filaments [1]. **1. Why Cytokeratin is Correct:** * **Cytokeratin (CK)** is the characteristic intermediate filament found in **epithelial cells**. * Since **Carcinomas** are malignant tumors of epithelial origin, they express Cytokeratin [1]. * **Lymphomas**, being of lymphoid origin, express **Leukocyte Common Antigen (LCA/CD45)** but are negative for Cytokeratin. Therefore, CK positivity confirms a carcinoma and rules out lymphoma [1]. **2. Why Other Options are Incorrect:** * **Desmin (Option A):** This is an intermediate filament found in **skeletal, smooth, and cardiac muscle**. It is used to identify myogenic tumors like Rhabdomyosarcoma or Leiomyosarcoma. * **Myoglobin (Option B):** This is a cytoplasmic protein found specifically in **striated muscle** (skeletal and cardiac). It is a highly specific marker for Rhabdomyosarcoma but is not found in epithelial or lymphoid cells. * **Vimentin (Option C):** This is the intermediate filament of **mesenchymal cells**. While it is expressed in sarcomas, it is considered "non-specific" because it can be co-expressed in some carcinomas (e.g., Renal Cell Carcinoma) and lymphomas. It cannot reliably distinguish between the two. **Clinical Pearls for NEET-PG:** * **Common IHC Panel for Undifferentiated Tumors:** * **Carcinoma:** Cytokeratin (+) * **Lymphoma:** LCA / CD45 (+) * **Melanoma:** S100, HMB-45, or Melan-A (+) * **Sarcoma:** Vimentin (+) * **High-Yield Fact:** Small cell carcinoma (Neuroendocrine) often shows a "perinuclear dot-like" staining pattern with Cytokeratin 20 (CK20). **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. (Basic Pathology) introduces the student to key general principles of pathology, both as a medical science and as a clinical activity with a vital role in patient care. Part 2 (Disease Mechanisms) provides fundamental knowledge about the cellular and molecular processes involved in diseases, providing the rationale for their treatment. Part 3 (Systematic Pathology) deals in detail with specific diseases, with emphasis on the clinically important aspects., pp. 208-209.

Question 106: What is the principle of the Prussian blue stain?

A. Oxidation of ferrous iron to ferricyanide
B. Oxidation of ferrocyanide to ferric ferrocyanide (Correct Answer)
C. Oxidation of ferroferricyanide to ferrocyanide
D. Oxidation of ferrocyanide to ferricferrocyanide

Explanation: **Explanation:** The **Prussian blue reaction** (Perls' stain) is the gold standard for detecting non-heme ferric iron ($Fe^{3+}$) in tissues, such as hemosiderin [1][2]. **1. Why the correct answer is right:** The principle involves treating tissue sections with a mixture of **potassium ferrocyanide** and dilute hydrochloric acid (HCl). The HCl releases ferric ions ($Fe^{3+}$) from binding proteins like ferritin and hemosiderin [2]. These free ferric ions then react with the potassium ferrocyanide. The chemical reaction results in the **oxidation of ferrocyanide to ferric ferrocyanide**, an insoluble bright blue pigment known as Prussian blue. * **Chemical Equation:** $4Fe^{3+} + 3K_4[Fe(CN)_6] \rightarrow Fe_4[Fe(CN)_6]_3$ (Prussian Blue) + $12K^+$ **2. Why the incorrect options are wrong:** * **Option A & C:** These involve "ferricyanide." Ferricyanide is used in the **Turnbull Blue** reaction, which detects *ferrous* ($Fe^{2+}$) iron, not the ferric iron typically found in hemosiderin. * **Option D:** While it mentions the correct reactants, the specific chemical transformation in the Perls' reaction is the formation of the complex salt **ferric ferrocyanide**. **3. Clinical Pearls for NEET-PG:** * **Primary Use:** Diagnosis of **Hemochromatosis** and **Hemosiderosis** [1]. * **Hematology:** Used on bone marrow aspirates to assess iron stores and identify **Sideroblastic anemia** (Ringed sideroblasts) [2]. * **Differential:** It does *not* stain iron bound to hemoglobin or myoglobin [2]. * **Asbestos:** It is used to visualize **ferruginous bodies** (asbestos bodies coated with iron). **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Liver and Gallbladder, pp. 854-855. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Cellular Responses to Stress and Toxic Insults: Adaptation, Injury, and Death, pp. 75-76.

Question 107: Which of the following statements about BCR-ABL 'traits' is NOT true?

A. P190 BCR-ABL fusion protein is associated with an indolent clinical course. (Correct Answer)
B. P190 BCR-ABL fusion protein is considered a bad prognostic factor.
C. P230 BCR-ABL fusion protein is positive in chronic neutrophilic leukemia.
D. P230 BCR-ABL fusion protein is associated with an indolent clinical course.

Explanation: The **BCR-ABL1** fusion gene, resulting from the **t(9;22)** translocation (Philadelphia chromosome), produces different protein isoforms depending on the breakpoint in the *BCR* gene [1], [2]. The clinical behavior of the associated leukemia is directly linked to the size of the protein produced. ### Why Option A is the Correct Answer (The "NOT True" Statement) **P190 BCR-ABL** is formed by a breakpoint in the minor breakpoint cluster region (**m-bcr**). Unlike the classic P210 found in CML, P190 has higher tyrosine kinase activity [2]. It is primarily associated with **B-cell Acute Lymphoblastic Leukemia (B-ALL)** and occasionally "Ph+ AML." Because it typically manifests as an acute leukemia, it follows an **aggressive**, not indolent, clinical course [3]. ### Explanation of Other Options * **Option B:** In the context of B-ALL, the presence of the P190 fusion protein is a **poor prognostic factor** compared to other genetic subtypes, requiring intensive therapy or tyrosine kinase inhibitors (TKIs) [3]. * **Option C & D:** The **P230** isoform (micro-bcr or **μ-bcr**) involves a larger portion of the BCR gene. It is the hallmark of **Chronic Neutrophilic Leukemia (CNL)** and a rare variant of CML. Clinically, P230 is associated with a more **indolent** (slow-growing) course, often presenting with prominent neutrophilia and minimal blast counts. ### NEET-PG High-Yield Pearls * **P190 (m-bcr):** Associated with **ALL** (found in 25% of adults and 3% of children). * **P210 (M-bcr):** The classic isoform associated with **Chronic Myeloid Leukemia (CML)** [1], [2]. * **P230 (μ-bcr):** Associated with **CNL** and "neutrophilic-CML"; has the most indolent course. * **Mechanism:** The ABL portion provides constitutive **tyrosine kinase activity**, which activates downstream signaling pathways (JAK/STAT, PI3K/AKT) leading to uncontrolled cell proliferation [2]. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. (Basic Pathology) introduces the student to key general principles of pathology, both as a medical science and as a clinical activity with a vital role in patient care. Part 2 (Disease Mechanisms) provides fundamental knowledge about the cellular and molecular processes involved in diseases, providing the rationale for their treatment. Part 3 (Systematic Pathology) deals in detail with specific diseases, with emphasis on the clinically important aspects., pp. 225-226. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 605-607. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of White Blood Cells, Lymph Nodes, Spleen, and Thymus, pp. 600-602.

Question 108: Which organ is most commonly associated with a red infarct?

A. Small intestine (Correct Answer)
B. Kidney
C. Spleen
D. Heart

Explanation: Enriched Explanation: Infarcts are classified as **Red (Hemorrhagic)** or **White (Anemic)** based on the amount of hemorrhage into the necrotic tissue [1]. **Why Small Intestine is Correct:** Red infarcts typically occur in tissues with a **dual blood supply**, loose architecture, or when there is venous occlusion [1]. The **Small Intestine** is the classic example because it has extensive collateral circulation (mesenteric arcades) [2]. When an arterial occlusion occurs, blood from collateral vessels seeps into the necrotic area. Additionally, the loose nature of the bowel wall allows blood to collect, giving it a dark red, hemorrhagic appearance [2]. **Why Incorrect Options are Wrong:** * **Kidney (B) and Spleen (C):** These are solid organs with **end-arterial circulation** (no significant collaterals) [1]. When an artery is blocked, there is no secondary source of blood to fill the area, resulting in a **White (Anemic) Infarct** [1]. These are typically wedge-shaped with the apex pointing toward the occlusion. * **Heart (D):** The myocardium is a solid organ with limited collateral flow. Myocardial infarctions are typically **White Infarcts**, though they may show some peripheral redness due to inflammation [1]. **High-Yield NEET-PG Pearls:** * **Red Infarct Locations:** Think of the mnemonic **"LOBES"**: **L**ungs (dual supply: bronchial and pulmonary), **O**vary (torsion/venous occlusion), **B**owel (collaterals), **E**nd-organ with reperfusion (e.g., post-thrombolysis), and **S**uperior Sagittal Sinus thrombosis (venous) [1]. * **White Infarct Locations:** Heart, Spleen, and Kidney [1]. * **Morphology:** Most infarcts are wedge-shaped. The hallmark of all infarcts (except the brain) is **coagulative necrosis** [1]. The brain undergoes **liquefactive necrosis**. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Hemodynamic Disorders, Thromboembolic Disease, and Shock, p. 140. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, pp. 784-786.

Question 109: Which of the following is true about Nodular Regenerative Hyperplasia?

A. Nodule size 0.1 to 1 cm
B. Fibrosis septa present
C. Portal hypertension seen in 50% of patients (Correct Answer)
D. AST and ALT are markedly elevated

Explanation: **Explanation:** **Nodular Regenerative Hyperplasia (NRH)** is a rare liver condition characterized by the transformation of normal liver parenchyma into small, regenerative nodules without significant fibrosis. 1. **Why Option C is Correct:** The primary clinical significance of NRH is its association with **non-cirrhotic portal hypertension**. Approximately 50% of patients develop clinical signs of portal hypertension, such as esophageal varices, splenomegaly, or ascites. This occurs because the nodules compress the intrahepatic portal vein branches, increasing vascular resistance despite the absence of cirrhosis. 2. **Why Other Options are Incorrect:** * **Option A:** The nodules in NRH are typically very small, usually ranging from **0.1 to 0.3 cm** (rarely exceeding 0.5 cm). A range up to 1 cm is more characteristic of macronodular cirrhosis [1]. * **Option B:** The hallmark histological feature that distinguishes NRH from cirrhosis is the **absence of fibrous septa** between the nodules. Reticulin staining is often required to visualize the collapsed framework and the "crowding" of hepatocytes. * **Option C:** Liver function tests (AST/ALT) are usually **normal or only mildly elevated** [2]. Marked elevation is suggestive of acute hepatitis or severe hepatocellular injury, not NRH. **High-Yield Clinical Pearls for NEET-PG:** * **Associations:** NRH is frequently associated with systemic conditions like **Rheumatoid Arthritis (Felty Syndrome)**, Hematologic malignancies, and the use of drugs like **Azathioprine**. * **Histology:** Look for "atrophic" hepatocytes in the periphery and "hyperplastic" hepatocytes in the center of the nodules. * **Key Distinction:** NRH = Nodules + No Fibrosis; Cirrhosis = Nodules + Fibrosis. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Liver And Biliary System Disease, pp. 395-396. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Liver And Biliary System Disease, pp. 396-398.

Question 110: ATM mutation is seen in which of the following conditions?

A. Ataxia telangiectasia (Correct Answer)
B. Fragile X syndrome
C. Joubert syndrome
D. Spinocerebellar ataxia

Explanation: **Explanation:** **1. Why Ataxia Telangiectasia is correct:** Ataxia Telangiectasia (AT) is an autosomal recessive multisystem disorder caused by mutations in the **ATM (Ataxia-Telangiectasia Mutated) gene** located on **chromosome 11q22-23**. The ATM protein is a critical serine/threonine kinase that senses **double-stranded DNA breaks** [1]. Upon detecting damage, it activates p53 and other checkpoint proteins to halt the cell cycle or initiate repair. A mutation leads to genomic instability, clinical ataxia, oculocutaneous telangiectasia, and profound radiosensitivity [1]. **2. Why the other options are incorrect:** * **Fragile X Syndrome:** Caused by a **CGG trinucleotide repeat expansion** in the **FMR1 gene** on the X chromosome, leading to hypermethylation and gene silencing. * **Joubert Syndrome:** A ciliopathy characterized by the "molar tooth sign" on MRI. It is genetically heterogeneous, involving mutations in genes like **INPP5E or TMEM67**, but not ATM. * **Spinocerebellar Ataxia (SCA):** Most common forms (SCA1, 2, 3) are caused by **CAG trinucleotide repeats** (polyglutamine diseases) in various genes (e.g., ATXN1), not ATM [1]. **3. High-Yield Clinical Pearls for NEET-PG:** * **Classic Triad:** Progressive cerebellar ataxia, oculocutaneous telangiectasias, and recurrent sinopulmonary infections (due to **IgA deficiency**). * **Laboratory Marker:** Characteristically elevated **Alpha-Fetoprotein (AFP)** levels in children. * **Malignancy Risk:** Patients have a 100-fold increased risk of developing lymphomas and leukemias. * **Diagnostic Hallmark:** Increased sensitivity to **ionizing radiation** (due to defective DNA repair). **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Central Nervous System, pp. 1300-1301.

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