Neoplasia — MCQs

Neoplasia Indian Medical PG Practice Questions and MCQs

Question 541: A malignant epithelial cell neoplasm derived from any of the three germ layers is referred to as:

A. Sarcoma
B. Carcinoma
C. Teratoma (Correct Answer)
D. Mixed cell tumor

Explanation: **Explanation:** **Correct Answer: C. Teratoma** A **Teratoma** is a germ cell tumor composed of tissues derived from more than one germ cell layer—and frequently all three: **ectoderm, mesoderm, and endoderm** [1]. These tumors arise from totipotent germ cells (typically in the ovaries or testes) that differentiate into various recognizable tissues such as hair, teeth (ectoderm), muscle, bone (mesoderm), and gut epithelium (endoderm) [1], [3]. While the question mentions "epithelial cell neoplasm," in the context of deriving from all three layers, Teratoma is the definitive pathological classification. **Analysis of Incorrect Options:** * **A. Sarcoma:** These are malignant tumors arising from **mesenchymal tissues** (connective tissue, bone, muscle, fat). They do not originate from all three germ layers. * **B. Carcinoma:** These are malignant neoplasms of **epithelial cell origin**. While epithelium can be derived from any germ layer (e.g., skin from ectoderm, gut from endoderm), a "carcinoma" specifically refers to the malignancy of that tissue type alone, not a mixture of all three layers. * **D. Mixed cell tumor:** Also known as Pleomorphic Adenoma (commonly in salivary glands), these show divergent differentiation of a **single germ layer** (usually ectoderm) into epithelial and mesenchymal-like components (myxoid/chondroid), rather than originating from all three layers. **High-Yield NEET-PG Pearls:** * **Monodermal Teratoma:** A specialized teratoma consisting of a single tissue type (e.g., **Struma ovarii** – thyroid tissue; **Carcinoid**) [2]. * **Maturity:** Mature teratomas (Dermoid cysts) are usually benign in females but can be malignant in males. Immature teratomas are graded based on the amount of **primitive neuroepithelium**. * **Common Site:** The most common site for extragonadal teratomas in children is the **sacrococcygeal region**. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Female Genital Tract Disease, pp. 480-481. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Female Genital Tract, p. 1034. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Female Genital Tract, pp. 1033-1034.

Question 542: Which of the following tumors has the propensity to metastasize through lymph nodes?

A. Alveolar rhabdomyosarcoma (Correct Answer)
B. Osteosarcoma
C. Both
D. None

Explanation: **Explanation:** In general oncology, a fundamental rule is that **Carcinomas** spread primarily via lymphatics, while **Sarcomas** spread primarily via the hematogenous (blood) route [1]. However, there are specific exceptions to this rule—sarcomas that frequently metastasize to lymph nodes—which are high-yield topics for NEET-PG. **1. Why Alveolar Rhabdomyosarcoma is correct:** Alveolar rhabdomyosarcoma (ARMS) is one of the classic exceptions to the "sarcomas spread by blood" rule. It has a high propensity for regional lymph node involvement (up to 20-30% of cases). This tumor is characterized by the translocation **t(2;13)** or **t(1;13)** involving the *PAX3* or *PAX7* and *FOXO1* genes [3]. **2. Why Osteosarcoma is incorrect:** Osteosarcoma follows the classic rule for sarcomas. It spreads almost exclusively via the hematogenous route, with the **lungs** being the most common site of metastasis [1]. Lymph node involvement in osteosarcoma is extremely rare (less than 3%). **3. High-Yield Clinical Pearls for NEET-PG:** To master this topic, remember the mnemonic **"SCARE"** for sarcomas that spread via lymphatics: * **S:** **S**ynovial sarcoma [2] * **C:** **C**lear cell sarcoma * **A:** **A**ngiosarcoma / **A**lveolar rhabdomyosarcoma [3] * **R:** **R**habdomyosarcoma (specifically Alveolar subtype) [3] * **E:** **E**pithelioid sarcoma (the most common sarcoma to involve lymph nodes) **Key Takeaway:** While most sarcomas bypass lymph nodes to go straight to the lungs, Alveolar Rhabdomyosarcoma is a notable exception that requires clinical evaluation of regional nodal basins. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, pp. 280-282. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Bones, Joints, and Soft Tissue Tumors, pp. 1225-1226. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Bones, Joints, and Soft Tissue Tumors, pp. 1224-1225.

Question 543: Wilms tumor is associated with all of the following except?

A. Hemihypertrophy
B. Aniridia
C. Hypertension
D. Bilateral polycystic kidney (Correct Answer)

Explanation: **Explanation:** **Wilms tumor (Nephroblastoma)** is the most common primary renal tumor of childhood [3]. The correct answer is **D (Bilateral polycystic kidney)** because it is a distinct genetic cystic disease (ADPKD/ARPKD) [2] and is not a recognized component of the syndromic associations of Wilms tumor. **Why the other options are associated with Wilms Tumor:** * **Hemihypertrophy:** This is a classic feature of **Beckwith-Wiedemann Syndrome (BWS)**, which includes macroglossia, organomegaly, and hemihypertrophy. Patients with BWS have a significantly increased risk of developing Wilms tumor due to mutations in the *WT2* gene (11p15.5). * **Aniridia:** Absence of the iris is a hallmark of **WAGR Syndrome** (Wilms tumor, Aniridia, Genitourinary anomalies, and mental Retardation) [1]. This results from a microdeletion on chromosome 11p13 involving the *WT1* and *PAX6* genes [1]. * **Hypertension:** Approximately 25% of patients with Wilms tumor present with hypertension. This occurs due to increased **renin production** by the tumor cells or compression of the renal artery by the tumor mass (Goldblatt kidney mechanism). **High-Yield Clinical Pearls for NEET-PG:** * **Genetics:** *WT1* gene (11p13) is associated with WAGR and Denys-Drash syndrome; *WT2* (11p15.5) is associated with Beckwith-Wiedemann syndrome [1]. * **Triphasic Histology:** Characterized by three components: **Blastemal** (small blue cells), **Stromal** (fibrocytic/myxoid), and **Epithelial** (tubules/glomeruli) [3]. * **Precursor Lesion:** Nephrogenic rests (important to screen the contralateral kidney if these are found) [3]. * **Prognosis:** The most important prognostic factor is **histology** (presence of anaplasia indicates poor prognosis). **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of Infancy and Childhood, pp. 487-488. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Diseases Of The Urinary And Male Genital Tracts, pp. 544-545. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of Infancy and Childhood, pp. 488-490.

Question 544: What is the most common extranodal site for lymphoma?

A. Esophagus
B. Stomach (Correct Answer)
C. Intestine
D. Skin

Explanation: **Explanation:** **Why Stomach is Correct:** Extranodal lymphomas account for approximately 25–40% of all Non-Hodgkin Lymphomas (NHL). The **Gastrointestinal (GI) tract** is the most common primary extranodal site, and within the GI tract, the **stomach** is the most frequently involved organ (50–60% of cases). The most common histological subtypes found in the stomach are **MALToma** (Mucosa-Associated Lymphoid Tissue lymphoma) and **Diffuse Large B-Cell Lymphoma (DLBCL)** [1]. A key risk factor for gastric MALToma is chronic infection with *Helicobacter pylori* [1]. **Analysis of Incorrect Options:** * **Esophagus:** This is the least common site for lymphoma in the GI tract. Primary esophageal lymphoma is extremely rare. * **Intestine:** While the small intestine (specifically the ileum due to Peyer's patches) is the second most common GI site, it lags significantly behind the stomach in frequency. * **Skin:** Cutaneous lymphomas (like Mycosis Fungoides) are the second most common extranodal site overall after the GI tract, but they do not surpass the stomach in incidence. **NEET-PG High-Yield Pearls:** * **Most common site for Extranodal Lymphoma:** Stomach. * **Most common GI Lymphoma subtype:** DLBCL (overall), though MALToma is classically associated with the stomach. * **H. pylori association:** Eradication of *H. pylori* can lead to regression of low-grade gastric MALTomas [1]. * **IPSID (Immunoproliferative Small Intestinal Disease):** A specific type of lymphoma involving the proximal small intestine, often associated with *Campylobacter jejuni*. * **Waldeyer’s Ring:** The second most common site for extranodal lymphoma in the head and neck region. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Alimentary System Disease, pp. 356-357.

Question 545: Tumor lysis syndrome is characterized by all of the following electrolyte abnormalities except?

A. Hyperkalemia
B. Hypercalcemia (Correct Answer)
C. Hyperuricemia
D. Hyperphosphatemia

Explanation: **Explanation:** **Tumor Lysis Syndrome (TLS)** is an oncologic emergency caused by the massive, rapid breakdown of tumor cells (most commonly in high-grade lymphomas and leukemias) following chemotherapy [1]. When these cells rupture, they release their intracellular contents into the systemic circulation, leading to a specific constellation of metabolic derangements. **Why Hypercalcemia is the Correct Answer (The "Except"):** TLS is characterized by **Hypocalcemia**, not hypercalcemia. This occurs because the massive release of intracellular phosphorus leads to **Hyperphosphatemia**. The excess phosphate binds to ionized calcium, forming calcium-phosphate crystals that precipitate in soft tissues and the kidneys. This "precipitation effect" rapidly depletes serum calcium levels. **Analysis of Other Options:** * **Hyperkalemia (A):** Potassium is the primary intracellular cation. Rapid cell lysis releases massive amounts of potassium into the blood, which can lead to life-threatening cardiac arrhythmias. * **Hyperuricemia (C):** The breakdown of nucleic acids (DNA/RNA) from tumor cells releases purines, which are metabolized by the liver into uric acid [1]. This can lead to acute uric acid nephropathy. * **Hyperphosphatemia (D):** Malignant cells often contain significantly higher concentrations of intracellular phosphorus than normal cells. Their destruction floods the extracellular space with phosphate. **High-Yield Clinical Pearls for NEET-PG:** * **Classic Tetrad:** Hyperkalemia, Hyperuricemia, Hyperphosphatemia, and **Hypocalcemia**. * **Renal Failure:** Acute Kidney Injury (AKI) in TLS is primarily due to the deposition of **calcium-phosphate crystals** and **uric acid crystals** in the renal tubules [1]. * **Prophylaxis/Treatment:** Aggressive hydration is the mainstay. **Allopurinol** (xanthine oxidase inhibitor) prevents new uric acid formation, while **Rasburicase** (recombinant urate oxidase) breaks down existing uric acid into allantoin. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, pp. 941-942.

Question 546: A 2-year-old boy is found to have bilateral retinal tumors. Molecular studies demonstrate a germline mutation in one allele of the Rb gene. Which of the following genetic events best explains the mechanism of carcinogenesis in this patient?

A. Balanced translocation
B. Expansion of trinucleotide repeat
C. Gene amplification
D. Loss of heterozygosity (Correct Answer)

Explanation: ### Explanation **1. Why "Loss of Heterozygosity" (LOH) is correct:** This case describes the classic **Knudson’s "Two-Hit" Hypothesis** of oncogenesis. The patient has a germline mutation in one allele of the *RB1* gene (the first "hit"), meaning every cell in his body is already heterozygous for the mutation [1]. However, the *RB1* gene is a **tumor suppressor gene**; as long as the second allele remains functional (wild-type), the cell can regulate the cell cycle [2]. Carcinogenesis occurs only when the second, functional allele is lost or inactivated in a retinal cell (the second "hit"). This transition from a heterozygous state to a homozygous/hemizygous state for the mutant allele is termed **Loss of Heterozygosity (LOH)** [3]. In hereditary cases, this often occurs via mitotic recombination, gene conversion, or chromosomal nondisjunction [1]. **2. Why other options are incorrect:** * **A. Balanced translocation:** Typically associated with the activation of proto-oncogenes (e.g., *t(8;14)* in Burkitt lymphoma) rather than the inactivation of tumor suppressors. * **B. Expansion of trinucleotide repeat:** This is the mechanism for neurodegenerative disorders like Huntington’s disease or Fragile X syndrome, not classic tumor suppressor inactivation. * **C. Gene amplification:** This involves an increase in the number of copies of an oncogene (e.g., *N-MYC* in neuroblastoma or *HER2/neu* in breast cancer), leading to protein overexpression. **3. High-Yield Clinical Pearls for NEET-PG:** * **RB Gene Location:** Chromosome **13q14** [1]. * **Function:** RB protein (pRb) controls the **G1 to S phase transition** by sequestering the **E2F transcription factor** [4]. * **Phosphorylation State:** **Hypophosphorylated** RB is active (binds E2F, stops cycle); **Hyperphosphorylated** RB is inactive (releases E2F, allows S-phase) [4]. * **Hereditary vs. Sporadic:** Hereditary retinoblastoma is usually **bilateral** and presents earlier (as seen in this 2-year-old), while sporadic is usually unilateral [1]. * **Secondary Malignancy:** Patients with germline *RB1* mutations have a high risk of developing **Osteosarcoma** later in life. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, p. 300. [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. 227-228. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, pp. 298-300. [4] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, pp. 300-301.

Question 547: What is the most important prognostic factor in breast carcinoma?

A. Histological grade of the tumour
B. Stage of the tumour at the time of diagnosis (Correct Answer)
C. Status of estrogen and progesterone receptors
D. Overexpression of p53 tumor suppressor gene

Explanation: **Explanation:** In oncology, particularly breast carcinoma, the **Stage of the tumour** (determined by the TNM classification) is the most significant predictor of overall survival and clinical outcome [1]. While many factors influence the disease, the extent of spread at the time of diagnosis dictates the curative potential and mortality risk. **Why the Correct Answer is Right:** * **Tumour Staging (TNM):** Evaluates the size of the primary tumor (T), involvement of regional lymph nodes (N), and presence of distant metastasis (M) [1]. * **Axillary Lymph Node Status:** Within the staging system, the presence and number of involved axillary lymph nodes is the **single most important prognostic factor** for patients with localized breast cancer [2]. Distant metastasis (Stage IV) remains the most significant overall indicator of poor prognosis [1]. **Analysis of Incorrect Options:** * **A. Histological Grade:** This refers to the degree of differentiation (Nottingham Grading System). While it correlates with aggressiveness, it is secondary to the stage in predicting survival [2]. * **C. ER/PR Status:** These are primarily **predictive factors** used to determine the likelihood of response to hormonal therapy (e.g., Tamoxifen), rather than the primary determinants of prognosis [2]. * **D. p53 Overexpression:** This is a molecular marker associated with a poorer prognosis and more aggressive behavior, but it lacks the clinical weight of anatomical staging. **High-Yield Clinical Pearls for NEET-PG:** * **Most important prognostic factor:** Staging (specifically Axillary Lymph Node status) [2]. * **Most important predictive factor:** HER2/neu or ER/PR status (predicts response to specific drugs). * **Sentinel Lymph Node Biopsy (SLNB):** The gold standard for initial nodal staging in clinically node-negative patients [2]. * **Size Matters:** For node-negative patients, the size of the primary tumor is the most important prognostic factor. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Breast, p. 1072. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Breast, pp. 1070-1072.

Question 548: Her2 neu receptor is used in breast carcinoma for what purpose?

A. Diagnosis of cancer
B. Screening of breast carcinoma
C. Detecting recurrence
D. Predicting response to treatment (Correct Answer)

Explanation: **Explanation:** The **HER2/neu (ERBB2)** gene, located on chromosome 17, encodes a transmembrane glycoprotein with intrinsic tyrosine kinase activity belonging to the Epidermal Growth Factor Receptor (EGFR) family [3]. In approximately 15–20% of breast cancers, this gene is amplified, leading to protein overexpression [2]. **Why Option D is Correct:** HER2/neu is primarily a **predictive marker**. Its presence predicts a favorable response to targeted therapies, specifically monoclonal antibodies like **Trastuzumab (Herceptin)** and tyrosine kinase inhibitors like Lapatinib [1]. Additionally, HER2-positive status often indicates a better response to anthracycline-based chemotherapy but a relative resistance to endocrine therapy (Tamoxifen). **Why Other Options are Incorrect:** * **A. Diagnosis:** Breast cancer is diagnosed via triple assessment (clinical exam, imaging, and biopsy/histopathology). HER2 status is determined *after* the diagnosis is established to guide management. * **B. Screening:** Screening relies on Mammography (gold standard). Molecular markers are not used for population screening. * **C. Detecting Recurrence:** Recurrence is typically monitored via clinical examination, imaging, or serum markers like **CA 15-3**, not HER2 expression on the primary tumor. **High-Yield Clinical Pearls for NEET-PG:** * **Prognostic vs. Predictive:** HER2 is both. It is **prognostically poor** (associated with aggressive disease and increased metastasis) but **predictively positive** (indicates response to Trastuzumab) [2]. * **Testing Method:** The initial screening is done via **Immunohistochemistry (IHC)**. A score of 3+ is positive; a score of 2+ (equivocal) must be confirmed by **FISH (Fluorescence In Situ Hybridization)**, which is the gold standard [2]. * **Pathway:** It signals through the **MAPK and PI3K/AKT** pathways, promoting cell proliferation and survival. **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. 256-259. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Breast, p. 1066. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Breast, pp. 1059-1060.

Question 549: What is the most common cause of renal tumors in adults?

A. Family history
B. Smoking (Correct Answer)
C. Obesity
D. Hypertension

Explanation: **Explanation:** Renal Cell Carcinoma (RCC) accounts for approximately 85-90% of all primary renal tumors in adults. Among the various environmental and lifestyle risk factors, **Smoking (Tobacco use)** is established as the most significant and common preventable risk factor. 1. **Why Smoking is Correct:** Tobacco use doubles the risk of developing RCC. The mechanism involves the systemic absorption of polycyclic aromatic hydrocarbons and nitrosamines, which are excreted via the kidneys, leading to direct urothelial and parenchymal DNA damage. There is a clear dose-response relationship between pack-years and tumor incidence. 2. **Why Incorrect Options are Wrong:** * **Family History:** While hereditary syndromes like Von Hippel-Lindau (VHL) are high-yield, they account for only **4-5%** of all RCC cases. The vast majority are sporadic. * **Obesity:** This is a significant risk factor (especially in women) due to increased estrogen levels and lipid peroxidation, but statistically, it follows smoking in prevalence. * **Hypertension:** There is a correlation between hypertension (and antihypertensive medications) and RCC, but it is considered a secondary risk factor compared to tobacco. **High-Yield Clinical Pearls for NEET-PG:** * **Most common histological subtype:** Clear Cell Carcinoma (associated with **VHL gene** deletion on Chromosome **3p**) [1]. * **Classic Triad (only in 10%):** Hematuria, palpable mass, and flank pain. * **Paraneoplastic Syndromes:** RCC is the "Great Mimicker," often causing polycythemia (via EPO), hypercalcemia (via PTHrP), and Cushing’s syndrome (via ACTH). * **Staging:** The most important prognostic factor is the **TNM stage**, specifically the involvement of the renal vein or IVC [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, pp. 957-958.

Question 550: What is the most important prognostic indicator of a mesenchymal tumor?

A. Type of primary
B. Type of primary (Correct Answer)
C. Size
D. Site

Explanation: In the evaluation of mesenchymal tumors (sarcomas), determining the **Type of Primary** (histological subtype) is the most critical prognostic indicator [1]. This is because the biological behavior, metastatic potential, and response to therapy are fundamentally dictated by the specific lineage of the tumor cells. ### Why "Type of Primary" is Correct Mesenchymal tumors are a heterogeneous group. For example, a **Well-differentiated Liposarcoma** has an excellent prognosis and rarely metastasizes, whereas an **Angiosarcoma** or **High-grade Rhabdomyosarcoma** is highly aggressive regardless of size [1]. The histological diagnosis determines the "grade" and the inherent aggressiveness of the neoplasm, making it the primary determinant of the patient's clinical outcome [1]. ### Why Other Options are Incorrect * **Size:** While size is a component of the TNM staging system (typically >5 cm indicates a poorer prognosis), it is secondary to the tumor type. A small high-grade sarcoma is often more dangerous than a large low-grade one. * **Site:** The location (e.g., retroperitoneal vs. extremity) affects surgical resectability and local recurrence rates, but it does not define the fundamental malignancy of the cells as the histological type does [1]. ### NEET-PG High-Yield Pearls * **Grading vs. Staging:** For most soft tissue sarcomas, the **Histological Grade** (based on differentiation, mitotic count, and necrosis) is the most important component of staging. * **Commonest Sarcoma:** In adults, the most common soft tissue sarcoma is **Undifferentiated Pleomorphic Sarcoma** (formerly MFH) or Liposarcoma; in children, it is **Rhabdomyosarcoma** [1]. * **Route of Spread:** Unlike carcinomas, most mesenchymal tumors spread primarily via the **hematogenous route** (most commonly to the lungs). **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Bones, Joints, and Soft Tissue Tumors, pp. 1222-1225.

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