Neoplasia — MCQs

Neoplasia Indian Medical PG Practice Questions and MCQs

Question 291: Kaposi's sarcoma is typically associated with which of the following viruses?

A. Hepatitis C virus (HCV)
B. Human Papillomavirus (HPV)
C. Herpes Simplex virus (HSV)
D. Human Herpesvirus 8 (HHV-8) (Correct Answer)

Explanation: **Explanation:** **Correct Answer: D. Human Herpesvirus 8 (HHV-8)** Kaposi’s Sarcoma (KS) is a low-grade vascular neoplasm derived from endothelial cells. The definitive etiological agent is **Human Herpesvirus 8 (HHV-8)**, also known as Kaposi Sarcoma-associated Herpesvirus (KSHV) [1]. HHV-8 encodes viral proteins (like v-cyclin and LANA) that interfere with host cell cycle checkpoints (p53 and Rb pathways), leading to uncontrolled endothelial proliferation. It is most commonly seen in the context of HIV/AIDS (Epidemic KS), but also occurs in elderly Mediterranean men (Classic KS), organ transplant recipients (Iatrogenic KS), and children in equatorial Africa (Endemic KS) [1]. **Incorrect Options:** * **A. Hepatitis C virus (HCV):** Primarily associated with Hepatocellular Carcinoma and Mixed Cryoglobulinemia; it does not cause vascular tumors. * **B. Human Papillomavirus (HPV):** High-risk strains (16, 18) are linked to squamous cell carcinomas of the cervix, anogenital region, and oropharynx via E6 and E7 oncoproteins [1]. * **C. Herpes Simplex virus (HSV):** HSV-1 and HSV-2 cause vesicular mucocutaneous lesions (cold sores and genital herpes) but are not oncogenic. **High-Yield Clinical Pearls for NEET-PG:** * **Histology:** Characterized by **spindle-shaped cells**, slit-like vascular spaces containing extravasated RBCs, and hyaline droplets. * **Marker:** **LANA-1** (Latent Nuclear Antigen) is the most specific immunohistochemical marker for HHV-8 in tissue sections. * **Clinical Presentation:** Presents as purple, red, or brown macules, plaques, or nodules, often on the skin but can involve the GI tract and lungs [1]. * **Association:** HHV-8 is also the causative agent for **Primary Effusion Lymphoma (PEL)** and a variant of **Multicentric Castleman Disease**. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of the Immune System, pp. 261-262.

Question 292: Kaposi's sarcoma is associated with which of the following?

A. HIV infection (Correct Answer)
B. Adenovirus
C. Picornavirus
D. All of the above

Explanation: **Explanation:** **Kaposi’s Sarcoma (KS)** is a vascular neoplasm caused by **Human Herpesvirus 8 (HHV-8)**, also known as Kaposi Sarcoma-associated Herpesvirus (KSHV) [1]. While HHV-8 is the definitive oncogenic driver, the clinical manifestation of KS is strongly associated with **HIV infection**, particularly in the "Epidemic" or AIDS-associated form [1]. In HIV patients, profound immunosuppression and the presence of the HIV-Tat protein act as co-factors that promote HHV-8 replication and spindle cell proliferation. **Analysis of Options:** * **Option A (HIV infection):** Correct. AIDS-associated KS is the most common and aggressive clinical variant [1]. It is an AIDS-defining illness. * **Option B (Adenovirus):** Incorrect. Adenoviruses typically cause respiratory infections, conjunctivitis, or gastroenteritis; they are not associated with vascular malignancies. * **Option C (Picornavirus):** Incorrect. This family includes viruses like Poliovirus and Hepatitis A, which do not have oncogenic potential for KS. **High-Yield Clinical Pearls for NEET-PG:** * **Histology:** Characterized by **slit-like vascular spaces** containing extravasated RBCs and spindle-shaped cells [2]. * **Four Clinical Variants:** 1. **Classic (European):** Older Mediterranean men; indolent [2]. 2. **Endemic (African):** Pre-AIDS era; can be aggressive in children (lymphadenopathic). 3. **Iatrogenic:** Post-transplant/immunosuppression. 4. **AIDS-associated:** Most common HIV-related malignancy [1]. * **Markers:** HHV-8 Latency-Associated Nuclear Antigen (**LANA-1**) is the most specific immunohistochemical marker. * **Cell of Origin:** Vascular endothelial cells or primitive mesenchymal cells. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of the Immune System, pp. 261-262. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of Infancy and Childhood, pp. 526-527.

Question 293: Melanoma staging according to which classification?

A. Breslow
B. Clark
C. Both Breslow and Clark (Correct Answer)
D. Bethesda

Explanation: **Explanation:** The staging and prognosis of malignant melanoma are primarily determined by the depth of invasion, which is assessed using two classic systems: the **Breslow Depth** and the **Clark Level** [1]. 1. **Breslow Depth (Quantitative):** This measures the actual vertical thickness of the tumor in millimeters (mm) from the granular layer of the epidermis to the deepest part of the tumor. It is the **most important prognostic factor** and is currently used in the AJCC (American Joint Committee on Cancer) TNM staging [1], [2]. 2. **Clark Level (Qualitative):** This assesses the anatomical level of invasion through the skin layers (Level I: Epidermis; Level II: Papillary dermis; Level III: Papillary-reticular interface; Level IV: Reticular dermis; Level V: Subcutaneous fat). While less predictive than Breslow, it is still used as a secondary staging tool, especially in thin melanomas. **Analysis of Options:** * **A & B:** Both are correct individually, but incomplete as they both contribute to the staging process. * **D. Bethesda:** This is a system used for reporting **Cervical Cytology** (Pap smears) or **Thyroid Cytopathology**, and is unrelated to melanoma. **High-Yield Clinical Pearls for NEET-PG:** * **Most important prognostic factor:** Breslow Depth. * **Most common site (Overall):** Skin (Back in men, legs in women). * **Most common subtype:** Superficial spreading melanoma. * **Worst prognosis subtype:** Nodular melanoma (due to early vertical growth). * **ABCDE Criteria:** Asymmetry, Border irregularity, Color variation, Diameter (>6mm), and Evolving. * **S-100 & HMB-45:** Key immunohistochemical (IHC) markers for diagnosis. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Disorders Involving Inflammatory And Haemopoietic Cells, pp. 650-651. [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. 236-237.

Question 294: Which of the following is NOT a genetic syndrome associated with an increased incidence of neuroendocrine tumors?

A. Multiple endocrine neoplasia 1
B. Von Hippel-Lindau disease
C. Von Recklinghausen's disease
D. Cri du chat syndrome (Correct Answer)

Explanation: **Explanation:** The correct answer is **Cri du chat syndrome**. This condition is a chromosomal deletion syndrome caused by a partial deletion of the short arm of **chromosome 5 (5p-)**. It is characterized by a high-pitched "cat-like" cry, microcephaly, and intellectual disability, but it is **not** associated with a predisposition to neuroendocrine tumors (NETs). **Analysis of other options:** * **Multiple Endocrine Neoplasia 1 (MEN1):** Caused by mutations in the *MEN1* gene (Menin). It classically involves the "3 Ps": Parathyroid hyperplasia, **Pancreatic islet cell tumors** (e.g., gastrinomas, insulinomas), and Pituitary adenomas [1]. * **Von Hippel-Lindau (VHL) disease:** Caused by mutations in the *VHL* gene (Chr 3p). While famous for hemangioblastomas and Renal Cell Carcinoma, it is strongly associated with **Pancreatic Neuroendocrine Tumors (PanNETs)** and Pheochromocytomas [2]. * **Von Recklinghausen’s disease (Neurofibromatosis Type 1):** Caused by *NF1* gene mutations. It is associated with various neuroendocrine manifestations, most notably **Pheochromocytomas** [2] and **Somatostatinomas** (specifically in the duodenum). **Clinical Pearls for NEET-PG:** * **Zollinger-Ellison Syndrome** is the most common functional NET associated with MEN1 [1]. * **Carcinoid tumors** are the most common neuroendocrine tumors of the GI tract (most common site: Appendix/Ileum). * **High-yield marker:** **Chromogranin A** is the most specific serum biomarker for monitoring neuroendocrine tumors, while **Synaptophysin** is a highly reliable immunohistochemical marker. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Endocrine System, pp. 1139-1140. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Endocrine System, p. 1137.

Question 295: Which gene suppresses apoptosis?

A. BCL-2 (Correct Answer)
B. BAK
C. BAX
D. BAD

Explanation: **Explanation:** The balance between cell survival and programmed cell death (apoptosis) is regulated by the **BCL-2 family of genes**, which act via the intrinsic (mitochondrial) pathway [1]. These genes are categorized into pro-apoptotic and anti-apoptotic groups based on their function. **Why BCL-2 is Correct:** **BCL-2** is the prototypical **anti-apoptotic (pro-survival) gene** [2]. It resides in the outer mitochondrial membrane and prevents the leakage of Cytochrome C into the cytosol by stabilizing the membrane and inhibiting the formation of "pores." By keeping Cytochrome C sequestered, BCL-2 prevents the activation of caspases, thereby **suppressing apoptosis** [2]. **Why the Other Options are Incorrect:** * **BAX and BAK (Options B & C):** These are the primary **pro-apoptotic** effectors [1]. When activated, they oligomerize to form channels (pores) in the mitochondrial membrane, leading to the release of Cytochrome C and the initiation of the caspase cascade. * **BAD (Option D):** This belongs to the **BH3-only protein** group. These act as "sensors" of cell stress. BAD promotes apoptosis by neutralizing anti-apoptotic proteins like BCL-2, thus allowing BAX and BAK to function. **NEET-PG High-Yield Pearls:** * **Translocation:** The *BCL-2* gene is famously associated with **t(14;18)** in **Follicular Lymphoma**, where its overexpression leads to immortalized B-cells [2]. * **Mnemonic:** Remember **"BAX/BAK = Back to the dust"** (Pro-apoptotic) and **"BCL-2 = Be Clean (Live)"** (Anti-apoptotic). * **The Gatekeeper:** **p53** induces apoptosis by upregulating BAX when DNA damage is irreparable [3]. **References:** [1] 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. 64-67. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, pp. 310-311. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, pp. 303-304.

Question 296: Which of the following carcinomas most frequently metastasizes to the brain?

A. Small cell carcinoma of the lung (Correct Answer)
B. Prostate cancer
C. Rectal carcinoma
D. Endometrial cancer

Explanation: **Explanation:** **Small cell carcinoma (SCLC) of the lung** is the correct answer because it is highly aggressive and characterized by early hematogenous spread [3]. Lung cancer is the most common primary source of brain metastases in adults, accounting for approximately 40-50% of cases [1]. Among lung cancers, SCLC has the highest propensity for CNS involvement; nearly 10-15% of patients have brain metastases at the time of diagnosis, and up to 50% will develop them during the course of the disease [2]. This is due to the tumor's neuroendocrine origin and its ability to easily breach the blood-brain barrier [3]. **Analysis of Incorrect Options:** * **Prostate Cancer:** Typically metastasizes via the Batson venous plexus to the axial skeleton (osteoblastic lesions). Brain metastasis is extremely rare [1]. * **Rectal Carcinoma:** Generally spreads to the liver (via the portal system) or the lungs. While it can reach the brain, it is significantly less frequent than lung primaries [1]. * **Endometrial Cancer:** Usually spreads via direct extension or to pelvic/paraaortic lymph nodes. Distant metastasis to the brain is an uncommon, late-stage event. **NEET-PG High-Yield Pearls:** * **Most common source of brain metastasis:** Lung > Breast > Melanoma > Colon > Kidney [1]. * **Melanoma** has the highest *percentage* likelihood of spreading to the brain, but **Lung cancer** is the most common *absolute* cause due to its higher incidence [1]. * **Prophylactic Cranial Irradiation (PCI):** Often given to SCLC patients who respond to initial therapy because the brain acts as a "pharmacologic sanctuary" where systemic chemotherapy cannot reach [4]. * **Brain Metastases Appearance:** Usually present as multiple, well-circumscribed lesions at the grey-white matter junction with significant perilesional edema. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Central Nervous System, pp. 1317-1318. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Lung, pp. 724-725. [3] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Respiratory Tract Disease, pp. 337-338. [4] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Respiratory Tract Disease, pp. 338-339.

Question 297: Extragonadal germ cell tumors occur in all of the following locations except?

A. Sacrococcygeal region
B. Mediastinum
C. Brain
D. Testis (Correct Answer)

Explanation: ### Explanation **Concept Overview** Extragonadal Germ Cell Tumors (EGCTs) are neoplasms that arise from primordial germ cells that failed to migrate correctly to the gonads (testes or ovaries) during embryogenesis. By definition, an **extragonadal** tumor must originate outside the gonads. **Why "Testis" is the Correct Answer** The question asks for the location that is **NOT** an extragonadal site. The **testis** is a primary gonad. Any germ cell tumor arising within the testis is classified as a primary gonadal tumor, not an extragonadal one [2]. Therefore, it is the "except" in this list. **Analysis of Incorrect Options (Common EGCT Sites)** Extragonadal germ cell tumors typically occur in **midline structures** of the body: * **Sacrococcygeal region (Option A):** This is the most common site for EGCTs in infants and children (specifically Sacrococcygeal Teratomas). * **Mediastinum (Option B):** The most common site for EGCTs in adults, usually located in the anterior mediastinum. * **Brain (Option C):** Specifically the pineal and suprasellar regions; these are often referred to as germinomas [1]. **High-Yield Clinical Pearls for NEET-PG** * **Origin:** EGCTs arise from the migration path of primordial germ cells from the yolk sac endoderm to the urogenital ridge. * **Most Common Site (Overall):** Mediastinum (Adults); Sacrococcygeal (Children). * **Genetic Marker:** Like their gonadal counterparts, most adult EGCTs (especially mediastinal non-seminomas) show **isochromosome 12p [i(12p)]**. * **Clinical Association:** Mediastinal non-seminomatous germ cell tumors are uniquely associated with **hematologic malignancies** (e.g., acute myeloid leukemia). * **Rule Out Primary:** When an EGCT is suspected, clinicians must always rule out a "burnt-out" primary tumor in the testis using ultrasound [2]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Endocrine System, pp. 1140-1141. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Diseases Of The Urinary And Male Genital Tracts, pp. 510-512.

Question 298: A 32-year-old woman is found to have an adnexal mass during a pelvic examination. Resection reveals a malignant ovarian tumor. Which other organ or tissue is associated with cancers linked to the tumor suppressor gene implicated in this ovarian tumor?

A. Breast (Correct Answer)
B. Colon
C. Pancreas
D. Peripheral nerve

Explanation: **Explanation:** The clinical presentation of a malignant ovarian tumor in a young woman (32 years old) strongly suggests a hereditary cancer syndrome, most commonly **Hereditary Breast and Ovarian Cancer (HBOC) syndrome**. This syndrome is caused by germline mutations in the **BRCA1** or **BRCA2** tumor suppressor genes. 1. **Why Breast is Correct:** BRCA1 and BRCA2 are involved in DNA repair via homologous recombination. Mutations in these genes significantly increase the lifetime risk of both **epithelial ovarian cancer** (serous carcinoma) and **female breast cancer** [1]. In NEET-PG, a young patient with ovarian cancer should immediately trigger the association with BRCA mutations and breast malignancy. 2. **Why Incorrect Options are Wrong:** * **Colon:** Associated with **Lynch Syndrome** (HNPCC) due to mutations in mismatch repair (MMR) genes (MLH1, MSH2). While Lynch syndrome increases ovarian cancer risk, it is more classically linked to endometrial and colorectal cancers. * **Pancreas:** While BRCA2 carries a slight risk for pancreatic cancer [2], the primary and most high-yield association for ovarian cancer in a young female remains the breast. * **Peripheral Nerve:** Associated with **Neurofibromatosis Type 1 (NF1)**, which presents with neurofibromas and MPNSTs, not typically ovarian malignancies. **Clinical Pearls for NEET-PG:** * **BRCA1:** Located on Chromosome **17q**. Associated with Fallopian tube and Breast cancer (often Triple Negative). * **BRCA2:** Located on Chromosome **13q**. Associated with Male breast cancer and Pancreatic cancer [2]. * **Psammoma bodies:** Frequently seen in Serous cystadenocarcinoma of the ovary (the most common type associated with BRCA). * **Prophylactic Surgery:** Salpingo-oophorectomy is recommended for mutation carriers after completing childbearing to reduce risk. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Breast, p. 1058. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Pancreas, pp. 898-899.

Question 299: Which of the following conditions is benign in nature?

A. Lymphoma
B. Lymphangioma (Correct Answer)
C. Melanoma
D. Leukemia

Explanation: **Explanation:** In medical nomenclature, the suffix **"-oma"** typically denotes a benign tumor (e.g., Adenoma, Lipoma) [2]. However, there are several critical exceptions where the suffix is used for malignant conditions [2]. **Correct Option: B. Lymphangioma** A lymphangioma is a **benign** malformation or tumor of the lymphatic vessels [1]. It is most commonly found in the neck or axilla of children (often referred to as a **Cystic Hygroma** when occurring in the neck). Unlike the other options, it does not metastasize and is characterized by endothelium-lined spaces filled with lymph. **Incorrect Options:** * **A. Lymphoma:** Despite the "-oma" suffix, this is always a **malignant** neoplasm of lymphoid tissue (e.g., Hodgkin and Non-Hodgkin Lymphoma). * **C. Melanoma:** This is a highly **malignant** tumor of melanocytes. It is one of the most aggressive skin cancers. * **D. Leukemia:** This is a **malignant** neoplasm of hematopoietic stem cells in the bone marrow, characterized by the replacement of normal marrow elements with abnormal white blood cells. **NEET-PG High-Yield Pearls:** * **The "Malignant -omas":** Always remember the classic exceptions—**Melanoma, Lymphoma, Mesothelioma, Seminoma, and Hepatoma** (Hepatocellular Carcinoma) are all **malignant** despite their names. * **Hamartomas:** These are non-neoplastic, disorganized masses of tissue indigenous to the site (e.g., Bile duct hamartoma) [1]. * **Choristoma:** A mass of histologically normal tissue in an abnormal location (ectopic rest), such as pancreatic tissue in the stomach wall. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of Infancy and Childhood, pp. 481-482. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, pp. 276-278.

Question 300: Tumor suppressor genes BRCA1 and BRCA2 prevent tumorigenesis by acting as what?

A. Inhibitors of mitogenic signaling pathways
B. Inhibitors of cell cycle progression
C. Inhibitors of invasion and metastasis
D. DNA repair factors (Correct Answer)

Explanation: **Explanation:** **1. Why DNA Repair Factors is Correct:** BRCA1 and BRCA2 are classic tumor suppressor genes that play a critical role in maintaining genomic stability. They function primarily in the **Homologous Recombination (HR)** pathway, which is the most accurate mechanism for repairing **double-stranded DNA breaks (DSBs)**. * **BRCA1** acts as a "sensor" and coordinator of the DNA damage response. * **BRCA2** specifically recruits RAD51 to the site of the break to initiate repair. [2] When these genes are mutated, cells cannot accurately repair DNA damage, leading to "genomic instability" and the accumulation of further mutations that drive oncogenesis. [1] **2. Why Other Options are Incorrect:** * **A & B:** These describe other classes of tumor suppressors. For example, **APC** and **NF1** inhibit mitogenic signaling (WNT and RAS pathways, respectively), while **RB** and **CDKN2A (p16)** act as "gatekeepers" by inhibiting cell cycle progression (G1-S transition). * **C:** Inhibitors of invasion and metastasis are often cell adhesion molecules like **E-cadherin** (CDH1). Loss of E-cadherin is associated with diffuse gastric cancer and lobular breast carcinoma, but it is not the primary function of BRCA genes. **3. High-Yield Clinical Pearls for NEET-PG:** * **Inheritance:** Autosomal Dominant with variable penetrance. * **Associated Cancers:** Breast (often triple-negative in BRCA1), Ovarian (serous cystadenocarcinoma), Prostate, and Pancreatic cancer. * **Synthetic Lethality:** This is a high-yield concept where BRCA-mutated tumors are specifically sensitive to **PARP Inhibitors** (e.g., Olaparib). Since the HR pathway is defective, blocking the alternative Base Excision Repair (BER) pathway via PARP inhibition leads to cell death. * **Chromosome Locations:** BRCA1 is on **17q21**; BRCA2 is on **13q12.3**. **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.

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Neoplasia — MCQs

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