Neoplasia — MCQs

Neoplasia Indian Medical PG Practice Questions and MCQs

Question 281: Which of the following is an oncogenic retrovirus?

A. HTLV-1 (Correct Answer)
B. HPV
C. EBV
D. HBV

Explanation: **Explanation:** The correct answer is **A. HTLV-1**. **Why HTLV-1 is correct:** Human T-cell Lymphotropic Virus type 1 (HTLV-1) is the only **RNA retrovirus** directly linked to human cancer, specifically **Adult T-cell Leukemia/Lymphoma (ATLL)** [2]. It utilizes the enzyme reverse transcriptase to integrate its viral genome into the host DNA. The oncogenic potential is primarily attributed to the **Tax gene**, which stimulates the proliferation of T-cells, inhibits DNA repair mechanisms, and activates pro-survival signaling pathways (like NF-̀B) [1]. **Why the other options are incorrect:** * **B. HPV (Human Papillomavirus):** This is a **DNA virus** [3]. High-risk strains (16, 18) cause cervical and oropharyngeal cancers by producing E6 and E7 oncoproteins, which inhibit p53 and RB tumor suppressor proteins, respectively [2]. * **C. EBV (Epstein-Barr Virus):** This is a **DNA virus** (Gamma-herpesvirus). it is associated with Burkitt lymphoma, Nasopharyngeal carcinoma, and Hodgkin lymphoma [2]. It infects B-cells via the CD21 receptor. * **D. HBV (Hepatitis B Virus):** This is a **DNA virus** (Hepadnaviridae). While it uses reverse transcription during its replication cycle, it is classified as a DNA virus and is a major cause of Hepatocellular Carcinoma (HCC) [2]. **High-Yield NEET-PG Pearls:** * **HTLV-1 Transmission:** Similar to HIV (blood, sexual contact, breast milk). * **ATLL Presentation:** Look for "flower cells" (cloverleaf nuclei) on peripheral smear and lytic bone lesions with hypercalcemia. * **Tax Protein:** The most important virulence factor for HTLV-1 oncogenesis [1]. * **RNA vs. DNA:** Most oncogenic viruses are DNA viruses (HPV, EBV, HBV, KSHV); HTLV-1 is the standout RNA retrovirus. (Note: HCV is an RNA virus but not a retrovirus). **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, p. 334. [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. 219-220. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of the Immune System, pp. 261-262.

Question 282: Which is the most aggressive variant of ameloblastoma?

A. Granular cell type (Correct Answer)
B. Follicular type
C. Plexiform type
D. Acanthomatous type

Explanation: **Explanation:** Ameloblastoma is a benign but locally aggressive odontogenic neoplasm [1]. While most variants are slow-growing, the **Granular cell type** is recognized as the most clinically aggressive histological variant. **1. Why Granular cell type is correct:** In this variant, the central cells of the odontogenic islands undergo extensive cytoplasmic transformation, becoming filled with eosinophilic granules (representing lysosomal aggregates). This variant is associated with a **higher rate of recurrence** (up to 33%) and a greater tendency for local infiltration compared to other conventional types. **2. Why other options are incorrect:** * **Follicular type:** This is the most common histological pattern. It consists of islands of epithelium resembling the enamel organ. While common, it is less aggressive than the granular cell variant. * **Plexiform type:** Characterized by cords and sheets of epithelium. It is the second most common type and is frequently seen in the maxilla, but it does not carry the same aggressive prognosis as the granular cell type. * **Acanthomatous type:** This variant shows squamous metaplasia with keratin formation in the center of the islands. It is often seen in older patients but is generally considered less aggressive. **High-Yield Facts for NEET-PG:** * **Most common site:** Posterior mandible (ramus area). * **Radiological appearance:** Classic "Soap-bubble" or "Honey-comb" multilocular radiolucency. * **Molecular marker:** **BRAF V600E** mutation is highly prevalent (found in ~80% of cases). * **Desmoplastic variant:** Unique because it often presents in the anterior maxilla and shows a "ground-glass" appearance on X-ray, mimicking fibro-osseous lesions. * **Malignant transformation:** Rare; "Ameloblastic carcinoma" shows cytological atypia, whereas "Malignant Ameloblastoma" refers to a histologically benign-looking tumor that metastasizes (usually to the lungs). **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Head and Neck, pp. 741-742.

Question 283: Which tumor marker is elevated in both hepatocellular carcinoma and testicular cancer?

A. AFP (Correct Answer)
B. CEA
C. HCG
D. CA-19

Explanation: **Explanation:** **AFP (Alpha-Fetoprotein)** is the correct answer because it is a glycoprotein normally produced by the fetal liver and yolk sac. In adults, its elevation is a hallmark of two specific conditions: 1. **Hepatocellular Carcinoma (HCC):** It serves as a primary screening and diagnostic marker [1]. 2. **Germ Cell Tumors (GCTs):** Specifically, it is elevated in **Yolk Sac Tumors** (Endodermal sinus tumors) and **Non-seminomatous germ cell tumors (NSGCTs)** of the testis. Note that AFP is *never* elevated in pure seminomas. **Analysis of Incorrect Options:** * **CEA (Carcinoembryonic Antigen):** Primarily used for monitoring **Colorectal Carcinoma**. It can also be elevated in pancreatic, gastric, and breast cancers, but it is not a specific marker for HCC or testicular GCTs. * **hCG (human Chorionic Gonadotropin):** This is the marker for **Choriocarcinoma** and is also elevated in some Seminomas (syncytiotrophoblastic components). While relevant to testicular cancer, it is not associated with HCC. * **CA 19-9:** This is the highly specific marker for **Pancreatic Adenocarcinoma** and **Cholangiocarcinoma**. **High-Yield Clinical Pearls for NEET-PG:** * **The "Rule of 500":** In a patient with cirrhosis, an AFP level >500 ng/mL is highly suggestive of HCC [1]. * **Yolk Sac Tumors:** AFP is the definitive marker; look for **Schiller-Duval bodies** on histology. * **Mixed GCTs:** If a testicular biopsy shows "Seminoma" but serum AFP is elevated, the diagnosis must be revised to a **Mixed Germ Cell Tumor**, as pure seminomas do not produce AFP. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Liver And Biliary System Disease, pp. 399-400.

Question 284: What is the most specific marker for prostate cancer?

A. Prostate-specific antigen (PSA) (Correct Answer)
B. Prostatic acid phosphatase (PAP)
C. Placental alkaline phosphatase (PLAP)
D. Neuron-specific enolase (NSE)

Explanation: **Explanation:** The correct answer is **Prostate-specific antigen (PSA)**. PSA is a serine protease produced by the ductal and acinar epithelium of the prostate. While it is "organ-specific" rather than "cancer-specific" (as levels can rise in BPH and prostatitis), it remains the most specific and widely used clinical marker for the screening, diagnosis, and monitoring of prostate adenocarcinoma [1]. In pathology, immunohistochemistry (IHC) for PSA is the gold standard for confirming the prostatic origin of a metastatic tumor. **Analysis of Incorrect Options:** * **Prostatic acid phosphatase (PAP):** This was the primary marker used before the advent of PSA. While it is elevated in prostate cancer, it is less sensitive for early-stage disease and has been largely replaced by PSA in clinical practice. * **Placental alkaline phosphatase (PLAP):** This is a characteristic marker for germ cell tumors, most notably **Seminoma** (dysgerminoma in females). It has no diagnostic utility for prostate cancer. * **Neuron-specific enolase (NSE):** This is a marker for neuroendocrine tumors (e.g., Small cell carcinoma of the lung, Neuroblastoma) and is not specific to the prostate. **High-Yield Clinical Pearls for NEET-PG:** * **PSA Velocity:** A rapid rise in PSA over time is more suggestive of malignancy than a single elevated value [1]. * **Free vs. Bound PSA:** A **lower percentage of free PSA** (<10-15%) is associated with a higher risk of prostate cancer, whereas a higher percentage is seen in BPH [1]. * **Prostate Health Index (phi):** A newer diagnostic tool combining total PSA, free PSA, and p2PSA for better specificity. * **Other IHC markers:** **Alpha-methylacyl-CoA racemase (AMACR)** is a highly sensitive positive marker for prostate cancer, while **p63** and **High Molecular Weight Cytokeratin (HMWK)** are negative markers (absent in cancer, present in benign glands) [2]. **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. 992-993. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Lower Urinary Tract and Male Genital System, pp. 990-992.

Question 285: What is the primary tumor marker for Hepatocellular Carcinoma (HCC)?

A. CEA
B. AFP (Correct Answer)
C. CA-125
D. HMB99

Explanation: **Explanation:** **Alpha-Fetoprotein (AFP)** is the gold-standard serum tumor marker for **Hepatocellular Carcinoma (HCC)**. [1] AFP is a glycoprotein normally produced by the fetal yolk sac and liver. In adults, pathological elevation (typically >400 ng/mL) is highly suggestive of HCC in the context of chronic liver disease or cirrhosis. It is also used to monitor treatment response and recurrence. [1] **Analysis of Incorrect Options:** * **A. CEA (Carcinoembryonic Antigen):** Primarily associated with **Colorectal Carcinoma**. It is also elevated in pancreatic, gastric, and breast cancers, but is non-specific for the liver. [2] * **C. CA-125 (Cancer Antigen 125):** The primary marker for **Serous Ovarian Carcinoma**. It can also be elevated in endometriosis or pelvic inflammatory disease. * **D. HMB-45 (Human Melanoma Black):** This is an immunohistochemical (IHC) marker used to identify **Melanoma**. It is not a serum marker. **High-Yield Clinical Pearls for NEET-PG:** * **AFP** is also elevated in **Yolk Sac Tumors** (Endodermal sinus tumors) of the ovary or testes. [2] * **Screening:** For patients with cirrhosis, the AASLD recommends screening for HCC every 6 months using **Ultrasound +/- AFP**. [1] * **Fibrolamellar variant of HCC:** Characteristically occurs in young adults without cirrhosis and typically has **normal AFP levels**. * **Other HCC Markers:** Des-gamma-carboxyprothrombin (DCP) and Glypican-3 (IHC marker) are emerging high-yield markers for HCC. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Liver And Biliary System Disease, pp. 399-400. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, p. 346.

Question 286: Which of the following histological features is characteristic of a benign lesion?

A. Well differentiated (Correct Answer)
B. Atypical
C. High mitotic figures
D. Locally invasive

Explanation: **Explanation:** The distinction between benign and malignant tumors is a fundamental concept in pathology, based on morphological and functional characteristics [1]. **1. Why "Well Differentiated" is correct:** Differentiation refers to the extent to which neoplastic cells resemble their normal parenchymal cells of origin, both morphologically and functionally [1]. **Benign tumors are almost always well-differentiated** [2]. For example, a lipoma consists of mature adipocytes that are indistinguishable from normal fat cells [1]. In contrast, malignant tumors range from well-differentiated to undifferentiated (anaplastic) [4]. **2. Why the other options are incorrect:** * **B. Atypical:** Cellular atypia (pleomorphism, hyperchromatic nuclei, increased N:C ratio) is a hallmark of **malignancy** or pre-malignant dysplasia [3]. Benign cells typically maintain uniform size and shape. * **C. High mitotic figures:** While some benign tumors (like leiomyomas) can show mitosis, a *high* mitotic rate, especially with **atypical/tripolar spindles**, is strongly suggestive of **malignancy** [3], reflecting rapid and uncontrolled cell proliferation. * **D. Locally invasive:** This is the most reliable feature (second only to metastasis) that distinguishes malignancy from benignancy. Benign tumors grow by expansion and are usually **encapsulated**, whereas malignant tumors infiltrate and destroy surrounding tissues [4]. **High-Yield Clinical Pearls for NEET-PG:** * **Metastasis** is the most definitive criterion for malignancy (except for CNS tumors and Basal Cell Carcinoma). * **Anaplasia** (lack of differentiation) is considered a hallmark of malignancy [3]. * **Exceptions to the "-oma" rule:** Remember that Melanoma, Lymphoma, Mesothelioma, and Seminoma are **malignant**, despite the suffix. * **Rate of growth:** Generally, benign tumors grow slowly over years, while malignant tumors grow rapidly [5]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, pp. 276-278. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, pp. 278-280. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, p. 278. [4] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, pp. 282-284. [5] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, p. 276.

Question 287: Blood-borne metastasis is unusual in which of the following neoplasms?

A. Osteosarcoma
B. Medullary carcinoma breast (Correct Answer)
C. Choriocarcinoma
D. Renal cell carcinoma

Explanation: **Explanation:** The standard rule in oncology is that **carcinomas** spread primarily via the lymphatic system, while **sarcomas** spread primarily via the hematogenous (blood-borne) route [1]. **Why Medullary Carcinoma of the Breast is the correct answer:** Medullary carcinoma is a rare subtype of invasive ductal carcinoma. Despite having high-grade cytological features (large pleomorphic cells, high mitotic index), it is paradoxically associated with a **better prognosis** than standard infiltrating ductal carcinoma [2]. It typically spreads via **lymphatics** to the axillary nodes rather than through the bloodstream [3]. Its characteristic "pushing borders" and dense lymphocytic infiltrate are thought to represent a host immune response that limits early hematogenous dissemination [2]. **Analysis of Incorrect Options:** * **Osteosarcoma:** As a mesenchymal tumor (sarcoma), hematogenous spread is the rule [1]. It characteristically metastasizes to the **lungs** via the blood very early in the disease course. * **Choriocarcinoma:** This is a highly vascular germ cell tumor. It is notorious for early and aggressive **hematogenous spread**, often presenting with "cannonball metastases" in the lungs. * **Renal Cell Carcinoma (RCC):** While a carcinoma, RCC is a classic **exception** to the rule. It frequently invades the renal vein and inferior vena cava, leading to early hematogenous spread to the lungs and bones. **High-Yield Clinical Pearls for NEET-PG:** * **Exceptions to the rule (Carcinomas that spread via blood):** Remember the mnemonic **"Four Carcinomas Route Hematogenously"** – **F**ollicular thyroid carcinoma, **C**horiocarcinoma, **R**enal cell carcinoma, and **H**epatocellular carcinoma. * **Sarcoma exception:** Rhabdomyosarcoma and Epithelioid sarcoma are known to occasionally spread via lymphatics. * **Medullary Breast Carcinoma:** Often associated with **BRCA1 mutations** and typically presents as a "triple-negative" breast cancer (ER/PR/HER2 negative). **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, pp. 280-282. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Liver And Biliary System Disease, pp. 455-456. [3] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Liver And Biliary System Disease, pp. 456-457.

Question 288: Psammoma bodies are characteristic findings in which of the following carcinomas?

A. Thyroid carcinoma (Correct Answer)
B. Carcinoma of the breast
C. Carcinoma of the stomach
D. Carcinoma of the testis

Explanation: **Explanation:** Psammoma bodies are microscopic, concentric, laminated calcified structures. They represent a form of **dystrophic calcification** occurring in necrotic tumor cells, where calcium salts deposit in layers around a single necrotic cell, creating a "sand-like" appearance (from the Greek *psammos*, meaning sand). **1. Why Thyroid Carcinoma is Correct:** Psammoma bodies are a hallmark feature of **Papillary Thyroid Carcinoma (PTC)** [1]. They are found in approximately 40-50% of cases, typically within the cores of the papillae or the surrounding stroma. Their presence in a fine-needle aspiration (FNA) or biopsy is highly suggestive of PTC [1]. **2. Analysis of Incorrect Options:** * **Carcinoma of the Breast:** While calcifications (microcalcifications) are common in Ductal Carcinoma in Situ (DCIS), they are usually amorphous or granular rather than the classic laminated Psammoma bodies. * **Carcinoma of the Stomach:** Gastric adenocarcinomas typically present with signet-ring cells or glandular patterns; they do not characteristically form Psammoma bodies. * **Carcinoma of the Testis:** Testicular tumors (like Seminomas or Yolk sac tumors) do not typically show these structures. **3. High-Yield NEET-PG Clinical Pearls:** To remember the common tumors associated with Psammoma bodies, use the mnemonic **"PSaMMoma"**: * **P:** **P**apillary thyroid carcinoma [1] * **S:** **S**erous cystadenocarcinoma of the ovary (most common site) * **M:** **M**eningioma * **M:** **M**esothelioma (Pleural) **Key Fact:** Psammoma bodies are an example of **dystrophic calcification** (occurs in dying/necrotic tissues with normal serum calcium levels), distinguishing them from metastatic calcification. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Endocrine System, p. 1099.

Question 289: What is the most common carcinoma that causes splenic metastasis?

A. Carcinoma of the pancreas
B. Carcinoma of the stomach
C. Carcinoma of the ovary (Correct Answer)
D. Carcinoma of the cervix

Explanation: **Explanation:** The spleen is an uncommon site for solid tumor metastasis due to its high concentration of immune cells (macrophages and lymphocytes), rhythmic contractions, and the sharp angle of the splenic artery. However, when splenic metastasis does occur, it is most frequently associated with **Carcinoma of the Ovary**. [1] **1. Why Carcinoma of the Ovary is correct:** Splenic involvement in ovarian cancer usually occurs via **peritoneal seeding** (transcoelomic spread). [1] The spleen is often involved as part of generalized peritoneal carcinomatosis, where tumor deposits settle on the splenic capsule or within the parenchyma. In surgical oncology, "splenectomy" is often part of cytoreductive surgery for advanced ovarian cancer to achieve optimal debulking. **2. Analysis of Incorrect Options:** * **Carcinoma of the Pancreas & Stomach:** While these organs are anatomically close to the spleen, they typically involve the spleen via **direct extension** (local invasion) rather than true distant metastasis. [2] * **Carcinoma of the Cervix:** This primarily spreads via local invasion into the pelvic structures or through the lymphatic system to the iliac nodes; hematogenous spread to the spleen is extremely rare. [3] **High-Yield Clinical Pearls for NEET-PG:** * **Most common source of splenic metastasis (Overall):** Malignant Melanoma (due to its high propensity for hematogenous spread). * **Most common source of splenic metastasis (Among Carcinomas):** Ovarian Carcinoma. * **Most common primary malignancy of the spleen:** Non-Hodgkin Lymphoma (NHL). * **Pathological Mechanism:** The spleen’s "anti-tumor" environment is attributed to the absence of afferent lymphatics and the high density of splenic macrophages which inhibit the "soil" for circulating "seeds" (tumor cells). [2] **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Female Genital Tract, pp. 1029-1032. [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. 632-634. [3] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Female Genital Tract Disease, pp. 470-471.

Question 290: Presence of epithelial pearls in the spinous layer of epithelium is characteristic of which of the following conditions?

A. Carcinoma (Correct Answer)
B. Pre-cancer
C. Dysplasia
D. Metaplasia

Explanation: **Explanation:** The presence of **epithelial pearls** (also known as keratin pearls) is a hallmark histological feature of **well-differentiated Squamous Cell Carcinoma (SCC)**. 1. **Why Carcinoma is correct:** Epithelial pearls are concentric layers of laminated keratin found within the nests of malignant epithelial cells. In a normal stratified squamous epithelium, keratinization occurs only on the surface. However, in invasive carcinoma, malignant cells retain the functional capacity to produce keratin but do so in abnormal locations (the spinous layer or deep within the stroma) due to the loss of normal architectural polarity and invasive growth [1]. Their presence signifies that the tumor is "well-differentiated." 2. **Why other options are incorrect:** * **Dysplasia:** Refers to disordered growth and maturation of the epithelium (e.g., pleomorphism, loss of polarity) [2]. While dysplasia is a precursor to cancer, it does not involve the invasion of cells into deeper layers or the formation of keratin pearls within the tissue stroma. * **Pre-cancer (Carcinoma in situ):** This involves full-thickness dysplasia where the basement membrane is still intact. Keratin pearls are typically a feature of *invasive* squamous cell carcinoma [2]. * **Metaplasia:** This is a reversible change where one adult cell type is replaced by another (e.g., columnar to squamous metaplasia in smokers) [2]. It does not involve the malignant nests or pearl formation seen in SCC. **High-Yield Clinical Pearls for NEET-PG:** * **Intercellular bridges** (desmosomes) and **Keratin pearls** are the two diagnostic histological markers for Squamous Cell Carcinoma. * The presence of many keratin pearls indicates a **low-grade (Grade I)**, well-differentiated tumor. As the grade increases (poorly differentiated), these pearls disappear. * **Individual cell keratinization** (dyskeratosis) is another key feature of SCC. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Disorders Involving Inflammatory And Haemopoietic Cells, pp. 644-645. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Lung, p. 723.

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Neoplasia — MCQs

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