Neoplasia — MCQs

Neoplasia Indian Medical PG Practice Questions and MCQs

Question 451: The MEN1 tumor suppressor gene is associated with all of the following, except:

A. Menin
B. JunD
C. KMT2A (MLL)
D. GDNF (glial-derived neurotrophic factor) (Correct Answer)

Explanation: ### Explanation The **MEN1 gene**, located on chromosome **11q13**, is a tumor suppressor gene that encodes the protein **Menin**. This question tests your knowledge of the molecular interactions of Menin versus the genetic basis of other Multiple Endocrine Neoplasia (MEN) syndromes. **Why Option D is Correct:** **GDNF (Glial-derived neurotrophic factor)** is the ligand that binds to the **RET receptor tyrosine kinase**. Mutations in the *RET* proto-oncogene are responsible for **MEN2A and MEN2B**, not MEN1 [1]. Therefore, GDNF is associated with the RET signaling pathway, making it the correct "except" choice. **Why the Other Options are Incorrect:** * **A. Menin:** This is the direct protein product of the *MEN1* gene. It is a nuclear protein that plays a critical role in transcriptional regulation and genome stability. * **B. JunD:** Menin directly binds to the transcription factor **JunD** [1]. Under normal conditions, Menin suppresses JunD-mediated transcriptional activation; loss of this tumor suppressor interaction is believed to contribute to the endocrine neoplasia observed in MEN1 [1]. * **C. KMT2A (MLL):** Menin acts as a scaffold protein that interacts with **KMT2A (Mixed Lineage Leukemia protein)**, a histone methyltransferase [1]. This complex regulates the expression of *HOX* genes and *CDKN1B* (p27), which are vital for cell cycle control. --- ### High-Yield Clinical Pearls for NEET-PG: * **MEN1 Syndrome (Wermer Syndrome):** Characterized by the "3 Ps": **P**arathyroid (Hyperplasia/Adenoma), **P**ancreas (Gastrinoma/Insulinoma), and **P**ituitary (Prolactinoma) [1]. * **Inheritance:** Autosomal Dominant; follows Knudson’s "Two-Hit Hypothesis." * **MEN2A/2B:** Associated with **RET proto-oncogene** (Chr 10) [1]. Prophylactic thyroidectomy is often indicated in these patients due to the high risk of Medullary Thyroid Carcinoma. * **Key Interaction:** Remember that Menin is a **tumor suppressor**, while RET is a **proto-oncogene**. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Endocrine System, pp. 1139-1140.

Question 452: Human papillomavirus 16 increases the risk of all the following conditions EXCEPT?

A. Cervical squamous cell cancer
B. Anal cancer
C. Endometroid adenocarcinoma (Correct Answer)
D. Oropharyngeal cancer

Explanation: **Explanation:** The correct answer is **Endometroid adenocarcinoma** because its pathogenesis is primarily linked to hormonal imbalances (excess estrogen) and mutations in genes like *PTEN*, rather than viral infection. **1. Why Endometroid Adenocarcinoma is the correct answer:** Endometroid adenocarcinoma is the most common type of endometrial cancer. It arises from endometrial hyperplasia due to **unopposed estrogen stimulation** [1]. Risk factors include obesity, nulliparity, and early menarche [2]. Unlike cervical or oropharyngeal cancers, there is no established causal link between Human Papillomavirus (HPV) and the development of endometrial carcinoma. **2. Why the other options are incorrect:** High-risk HPV types (specifically **16 and 18**) are strongly oncogenic due to the proteins **E6** (which degrades p53) and **E7** (which inhibits RB) [4]. * **Cervical Squamous Cell Cancer:** HPV 16 is the most common cause, found in approximately 50-60% of cases [3]. * **Anal Cancer:** Strongly associated with HPV 16, particularly in MSM (men who have sex with men) and immunocompromised individuals. * **Oropharyngeal Cancer:** There is a rising incidence of squamous cell carcinomas of the tonsils and base of tongue linked specifically to HPV 16. **NEET-PG High-Yield Pearls:** * **HPV 16:** Most common type in Squamous Cell Carcinoma (Cervix, Anus, Oropharynx, Vulva, Penis) [3]. * **HPV 18:** Higher association with **Adenocarcinoma of the cervix**. * **Mechanism:** E6 inhibits **p53**; E7 inhibits **RB** (p21) [4]. * **Vaccination:** The Quadrivalent vaccine (Gardasil) targets types 6, 11, 16, and 18. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Female Genital Tract, pp. 1016-1017. [2] 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. 222-223. [3] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Female Genital Tract Disease, pp. 466-467. [4] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Female Genital Tract, pp. 1007-1008.

Question 453: Lymphoma is caused by all of the following viruses except?

A. HIV
B. EBV
C. HSV (Correct Answer)
D. HHV8

Explanation: **Explanation:** The correct answer is **HSV (Herpes Simplex Virus)**. While many viruses are known to be oncogenic (capable of inducing tumors), HSV-1 and HSV-2 are primarily associated with mucocutaneous infections (cold sores and genital herpes) and have no proven causal link to the development of lymphomas or other malignancies. **Analysis of Options:** * **HIV (Human Immunodeficiency Virus):** HIV is strongly associated with various lymphomas, particularly **Diffuse Large B-Cell Lymphoma (DLBCL)** and **Burkitt Lymphoma** [1]. The mechanism is indirect; by causing profound immunosuppression and B-cell activation, it allows oncogenic viruses like EBV to thrive [2]. * **EBV (Epstein-Barr Virus):** This is a classic oncogenic virus linked to multiple lymphomas, including **Burkitt Lymphoma** (starry-sky appearance), **Hodgkin Lymphoma** (mixed cellularity subtype), and **NK/T-cell lymphoma** [3]. It infects B-cells via the CD21 receptor. * **HHV-8 (Human Herpesvirus 8):** Also known as KSHV, it is the causative agent of **Primary Effusion Lymphoma (PEL)**, a rare B-cell lymphoma occurring in serous cavities, typically in HIV-positive patients [3]. It is also the primary cause of Kaposi Sarcoma [2]. **High-Yield NEET-PG Pearls:** * **HTLV-1:** The only RNA virus directly linked to a lymphoma (**Adult T-cell Leukemia/Lymphoma**) [3]. * **H. pylori:** A bacterium (not a virus) associated with **MALToma** (Marginal Zone Lymphoma). * **Hepatitis C Virus (HCV):** Associated with **Splenic Marginal Zone Lymphoma** and Lymphoplasmacytic Lymphoma [3]. * **MCQ Tip:** If a question asks for a virus *not* associated with cancer, look for HSV or HPV types 6/11 (which cause warts, not cancer) [3]. **References:** [1] 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. 595-596. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of the Immune System, pp. 261-262. [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. 219-220.

Question 454: C-MYC translocation is seen in which of the following tumors?

A. Burkitt lymphoma (Correct Answer)
B. Neuroblastoma
C. Malignant melanoma
D. Breast cancer

Explanation: **Explanation:** **C-MYC** is a proto-oncogene located on chromosome 8 that encodes a transcription factor involved in cell cycle progression and apoptosis. 1. **Why Burkitt Lymphoma is correct:** Burkitt lymphoma is the classic example of a tumor driven by **C-MYC translocation** [1]. The most common translocation is **t(8;14)**, where the *MYC* gene on chromosome 8 is moved adjacent to the **Immunoglobulin Heavy Chain (IgH)** locus on chromosome 14 [1]. This leads to the constitutive over-expression of the MYC protein, resulting in rapid cellular proliferation and the characteristic "starry-sky" histological appearance. 2. **Why other options are incorrect:** * **Neuroblastoma:** This tumor is typically associated with **N-MYC amplification** (double minute chromosomes or HSRs), not C-MYC translocation. N-MYC amplification is a key prognostic marker in Neuroblastoma. * **Malignant Melanoma:** Often associated with mutations in **BRAF (V600E)** or **NRAS**, rather than MYC translocations. * **Breast Cancer:** Frequently involves the amplification of **HER2/neu (ERBB2)** or mutations in **BRCA1/2**, but C-MYC translocation is not a defining genetic feature. **High-Yield Clinical Pearls for NEET-PG:** * **Translocations in Burkitt Lymphoma:** While t(8;14) is most common (80%), variant translocations include **t(2;8)** [kappa light chain] and **t(8;22)** [lambda light chain] [1]. * **L-MYC:** Associated with Small Cell Carcinoma of the Lung. * **MYC Function:** It activates cyclins and downregulates p21 (a CDK inhibitor). * **Burkitt Lymphoma Triad:** EBV association, "Starry-sky" morphology, and t(8;14). **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, pp. 324-325.

Question 455: Which of the following conditions is NOT associated with thymoma?

A. Myasthenia gravis
B. Cushing's syndrome
C. SIADH (Correct Answer)
D. Hypogammaglobulinemia

Explanation: **Explanation:** Thymomas are epithelial neoplasms of the thymus often associated with various **paraneoplastic syndromes** due to the thymus's role in immune regulation and its potential for ectopic hormone production [1]. **Why SIADH is the Correct Answer:** **SIADH (Syndrome of Inappropriate Antidiuretic Hormone)** is most classically associated with **Small Cell Carcinoma of the Lung**, not thymoma. While thymomas can produce various hormones, ADH is not typically among them. **Analysis of Incorrect Options:** * **Myasthenia Gravis (Option A):** This is the most common association. Approximately 30–45% of patients with thymoma have Myasthenia Gravis (MG), caused by autoantibodies against acetylcholine receptors [1]. * **Cushing’s Syndrome (Option B):** Thymic neuroendocrine tumors (carcinoids) and occasionally thymomas can cause ectopic ACTH production, leading to Cushing’s syndrome [1]. * **Hypogammaglobulinemia (Option C):** Also known as **Good Syndrome**, this is a recognized paraneoplastic triad of thymoma, hypogammaglobulinemia, and increased susceptibility to infections [1]. **High-Yield Clinical Pearls for NEET-PG:** * **Pure Red Cell Aplasia (PRCA):** A very high-yield association; about 5% of thymoma patients develop PRCA. * **Morphology:** Look for "Mixed" patterns of neoplastic epithelial cells and non-neoplastic T-lymphocytes (thymocytes) [2]. * **Staging:** The **Masaoka Staging System** is used to determine the prognosis of thymomas based on capsular invasion [2]. * **Key Associations Summary:** Myasthenia Gravis > Hypogammaglobulinemia (Good Syndrome) > Pure Red Cell Aplasia > Cushing’s Syndrome. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Diseases Of The Urinary And Male Genital Tracts, pp. 571-574. [2] 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. 634-635.

Question 456: Von Hippel-Lindau disease is associated with all of the following except?

A. Endolymphatic sac tumors
B. Hemangioblastomas (Correct Answer)
C. Pheochromocytoma
D. Islet cell tumors

Explanation: **Explanation** The question asks which condition is **not** associated with Von Hippel-Lindau (VHL) disease. However, there is a technical discrepancy in the provided key: **Hemangioblastomas are actually the hallmark lesion of VHL disease.** In the context of standard NEET-PG patterns, if this were an "Except" question, all options listed (A, B, C, and D) are recognized features of VHL syndrome. **1. Why the "Correct Answer" (B) is technically a core feature:** Hemangioblastomas are the most common manifestation of VHL, occurring in the cerebellum, retina, and spinal cord [1]. If the question intended to identify a non-association, Hemangioblastoma would be the *least* likely answer as it is the diagnostic cornerstone. **2. Analysis of Options (All are VHL-associated):** * **A. Endolymphatic sac tumors (ELSTs):** These are highly specific for VHL. They are benign but locally invasive vascular tumors of the inner ear that can cause hearing loss. * **B. Hemangioblastomas:** Found in 60-80% of patients; they are the most frequent presenting symptom [1]. * **C. Pheochromocytoma:** VHL Type 2 is specifically characterized by a high risk of pheochromocytomas (often bilateral) [1]. * **D. Islet cell tumors:** Pancreatic involvement in VHL includes simple cysts, serous cystadenomas, and **neuroendocrine (islet cell) tumors** [1]. **High-Yield Clinical Pearls for NEET-PG:** * **Genetics:** Autosomal Dominant; mutation in the **VHL gene on Chromosome 3p25**. * **The "VHL Triad":** Hemangioblastoma (CNS/Retina), Renal Cell Carcinoma (Clear cell type), and Pheochromocytoma [1]. * **RCC Risk:** VHL is the most common cause of hereditary RCC; these are usually multiple and bilateral. * **Pathogenesis:** Loss of VHL protein leads to failure of **HIF-1α (Hypoxia-inducible factor)** degradation, causing overexpression of VEGF and erythropoietin (leading to polycythemia). **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Endocrine System, p. 1137.

Question 457: Cylindroma is classified as which of the following types of tumors?

A. Appendage tumor (Correct Answer)
B. Acinic cell carcinoma
C. Pleomorphic adenoma
D. Warthin's tumor

Explanation: **Explanation:** **Cylindroma** is a benign adnexal neoplasm, specifically classified as an **appendage tumor** of the skin [1]. It most commonly arises from the sweat glands (eccrine or apocrine differentiation). These tumors typically present as smooth, firm, dome-shaped nodules, most frequently on the scalp and forehead. When multiple cylindromas cover the scalp, they are clinically referred to as a **"Turban Tumor."** **Analysis of Options:** * **A. Appendage tumor (Correct):** Cylindromas are classic examples of skin appendage tumors [1]. Histologically, they show a characteristic **"jigsaw puzzle" appearance**, consisting of nests of epithelial cells surrounded by thick, eosinophilic, PAS-positive basement membrane material [1]. * **B. Acinic cell carcinoma:** This is a malignant salivary gland tumor, most commonly found in the parotid gland. While it may show a microcystic pattern, it is not an appendage tumor. * **C. Pleomorphic adenoma:** Also known as a "Mixed Tumor," this is the most common benign salivary gland tumor. It is characterized by a mix of epithelial and mesenchymal (mucoid, chondroid) elements. * **D. Warthin's tumor:** Also known as Papillary Cystadenoma Lymphomatosum, this is a benign salivary gland tumor almost exclusively found in the parotid gland, characterized by a double layer of oncocytic epithelium and a dense lymphoid stroma. **High-Yield Clinical Pearls for NEET-PG:** * **Genetics:** Multiple cylindromas are associated with **Brooke-Spiegler Syndrome**, caused by a mutation in the **CYLD gene** (a tumor suppressor gene on chromosome 16q). * **Histology Keyword:** Look for the **"Jigsaw puzzle"** pattern or "islands of cells fitted together" [1]. * **Clinical Keyword:** **"Turban tumor"** is a classic buzzword for extensive scalp involvement. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Skin, pp. 1154-1156.

Question 458: Which of the following tumors is typically not seen in the first decade of life?

A. Retinoblastoma
B. Rhabdomyosarcoma
C. Neuroblastoma
D. Ameloblastoma (Correct Answer)

Explanation: **Explanation:** The correct answer is **D. Ameloblastoma**. **1. Why Ameloblastoma is the correct answer:** Ameloblastoma is a slow-growing, odontogenic (tooth-origin) epithelial tumor. While it can occur at any age, it is typically diagnosed in the **3rd to 5th decades of life** (peak incidence around 30–40 years). It is extremely rare in the first decade of life. It most commonly involves the mandible (molar-ramus area) and presents as a "soap-bubble" appearance on X-ray. **2. Why the other options are incorrect:** Options A, B, and C are classic **"Small Round Blue Cell Tumors"** of childhood, which characteristically present in the first decade [1]: * **Retinoblastoma:** The most common intraocular tumor of childhood; most cases are diagnosed before age 3 [1], [2]. * **Neuroblastoma:** The most common extracranial solid tumor of childhood, often arising from the adrenal medulla; 90% of cases are diagnosed before age 5 [1]. * **Rhabdomyosarcoma:** The most common soft tissue sarcoma in children [3]. The **Embryonal variant** specifically peaks between ages 0–5 years (often involving the head, neck, or genitourinary tract). **3. NEET-PG High-Yield Pearls:** * **Commonest Childhood Malignancy:** Leukemia (specifically ALL). * **Commonest Solid Childhood Tumor:** CNS Tumors. * **Ameloblastoma Radiology:** Classic "Soap-bubble" or "Honey-combed" multilocular radiolucency. * **Histopathology of Ameloblastoma:** Features "Stellate reticulum-like cells" and peripheral palisading of columnar cells with **reverse polarity** (Vickers-Gorlin criteria). * **Wilms Tumor (Nephroblastoma):** Another major tumor of the first decade (peak age 2–5 years) [1]. **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. 211-212. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Manifestations Of Central And Peripheral Nervous System Disease, pp. 737-738. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of Infancy and Childhood, pp. 481-482.

Question 459: Migratory thrombophlebitis is most commonly associated with which condition?

A. Pancreatic carcinoma (Correct Answer)
B. Colonic carcinoma
C. Nasopharyngeal carcinoma
D. Meningioma

Explanation: **Explanation:** **Migratory thrombophlebitis**, also known as **Trousseau sign of malignancy**, is a paraneoplastic syndrome characterized by recurrent episodes of vessel inflammation and clot formation that appear in different locations over time [1]. **Why Pancreatic Carcinoma is correct:** The association is strongest with **adenocarcinomas**, particularly **pancreatic carcinoma** (especially of the body and tail) [2]. The underlying mechanism involves the release of **procoagulants** (like tissue factor) and **mucins** from the tumor cells into the circulation [3]. These substances activate the coagulation cascade and trigger platelet aggregation, leading to spontaneous venous thrombosis in superficial and deep veins [1], [2]. **Analysis of Incorrect Options:** * **B. Colonic carcinoma:** While adenocarcinomas of the colon can cause a hypercoagulable state, they are less frequently associated with the classic "migratory" presentation compared to pancreatic cancer. * **C. Nasopharyngeal carcinoma:** This is strongly associated with EBV infection and typically presents with cervical lymphadenopathy or epistaxis, not paraneoplastic venous thrombosis. * **D. Meningioma:** These are usually benign CNS tumors. While they may cause local mass effects, they do not typically secrete systemic procoagulants. **High-Yield Clinical Pearls for NEET-PG:** * **Trousseau Sign (Malignancy):** Do not confuse this with the Trousseau sign of **hypocalcemia** (carpal spasm induced by BP cuff inflation). * **Hypercoagulability in Cancer:** Often referred to as a "chronic DIC" or "hypercoagulable state of malignancy." * **NBTE:** Patients with advanced adenocarcinomas are also at risk for **Non-Bacterial Thrombotic Endocarditis (Marantic endocarditis)**, where sterile vegetations form on heart valves. * **Location:** Pancreatic cancer in the **head** usually presents with obstructive jaundice; cancer in the **body/tail** is more likely to present late with paraneoplastic syndromes like migratory thrombophlebitis [2]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of Infancy and Childhood, pp. 522-523. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Pancreas, pp. 899-900. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Pancreas, p. 899.

Question 460: Colon carcinogenesis is associated with all of the following oncogenes/genes except:

A. APC
B. kRAS
C. B-catenin
D. None of the above (Correct Answer)

Explanation: ### Explanation The development of colorectal carcinoma follows a well-defined molecular pathway known as the **Adenoma-Carcinoma Sequence** (Fearon-Vogel model). This process involves the sequential accumulation of mutations in specific tumor suppressor genes and oncogenes [3]. **Why "None of the above" is correct:** All three genes listed (APC, kRAS, and $\beta$-catenin) are integral components of colon carcinogenesis. Since the question asks which is *not* associated, and all are indeed involved, "None of the above" is the correct choice. **Analysis of Options:** * **APC (Adenomatous Polyposis Coli):** This is a tumor suppressor gene located on chromosome 5q21. It is the "gatekeeper" of colonic neoplasia [2]. Loss of APC is the earliest event in the chromosomal instability pathway, seen in both sporadic cases and Familial Adenomatous Polyposis (FAP). * **$\beta$-catenin:** APC normally facilitates the degradation of $\beta$-catenin [1]. When APC is mutated (or if $\beta$-catenin itself undergoes a gain-of-function mutation), $\beta$-catenin translocates to the nucleus, activating genes like *MYC* and *Cyclin D1* that promote cell proliferation [1]. * **kRAS:** This is a proto-oncogene. Mutations in kRAS (typically at codons 12, 13, or 61) occur after APC loss [1]. It leads to constitutive activation of intracellular signaling, promoting the growth of a small adenoma into a larger, more dysplastic one [1]. **High-Yield Clinical Pearls for NEET-PG:** * **Sequence of Mutations:** APC (First/Gatekeeper) $\rightarrow$ kRAS (Growth) $ ightarrow$ DCC/SMAD4 $\rightarrow$ TP53 (Last/Invasion). * **Microsatellite Instability (MSI) Pathway:** An alternative pathway involving DNA mismatch repair genes (*MLH1, MSH2*), associated with Lynch Syndrome [3]. * **Therapeutic Note:** Patients with **kRAS mutations** do not respond to anti-EGFR therapy (e.g., Cetuximab), making kRAS testing essential for treatment planning. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, p. 819. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, pp. 304-305. [3] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Alimentary System Disease, pp. 373-374.

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