Neoplasia — MCQs

A 50-year-old female patient presented with swelling of the left upper limb with characteristic skin lesions. She has a history of undergoing Modified Radical Mastectomy (MRM) followed by chemotherapy and radiotherapy 7 years ago. A skin biopsy was taken. Which of the following markers would be most likely positive in this patient?

Q498Medium

All are true regarding foregut carcinoid tumors, except?

Q499Easy

HMB45 is a marker for which of the following?

Q500Easy

Which of the following is the primary tumor marker for hepatocellular carcinoma?

Neoplasia Indian Medical PG Practice Questions and MCQs

Question 491: What is the term for a benign tumor of smooth muscle?

A. Leiomyoma (Correct Answer)
B. Rhabdomyoma
C. Fibroma
D. Angiomyoma

Explanation: **Explanation:** The nomenclature of tumors is a high-yield topic for NEET-PG. In pathology, benign tumors are generally designated by adding the suffix **"-oma"** to the cell of origin [1]. **1. Why Leiomyoma is correct:** The prefix **"Leio-"** refers to smooth, and **"myo-"** refers to muscle. Therefore, a **Leiomyoma** is a benign neoplasm arising from smooth muscle cells [3]. These are most commonly encountered in the uterus (often colloquially called "fibroids"), but can occur anywhere smooth muscle is present, such as the gastrointestinal tract or skin. **2. Analysis of Incorrect Options:** * **Rhabdomyoma:** The prefix **"Rhabdo-"** refers to striated/skeletal muscle. Thus, a Rhabdomyoma is a benign tumor of skeletal muscle (rare) [2] or cardiac muscle (often associated with Tuberous Sclerosis). * **Fibroma:** This is a benign tumor arising from fibrous connective tissue (fibroblasts) [1]. * **Angiomyoma:** Also known as a vascular leiomyoma, this is a specific subtype of leiomyoma that contains numerous thick-walled blood vessels. While it contains smooth muscle, "Leiomyoma" is the broader, more accurate term for the general category. **Clinical Pearls for NEET-PG:** * **Malignant Counterparts:** Remember that malignant tumors of mesenchymal origin use the suffix **"-sarcoma."** (e.g., Leiomyosarcoma, Rhabdomyosarcoma) [1], [3]. * **Uterine Leiomyoma:** These are estrogen-dependent; they typically enlarge during pregnancy and regress after menopause. * **Histology:** On microscopy, leiomyomas characteristically show **"whirled" patterns** of smooth muscle bundles with blunt-ended (cigar-shaped) nuclei [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. 208-209. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Bones, Joints, and Soft Tissue Tumors, p. 1222. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Female Genital Tract, pp. 1024-1025.

Question 492: "HMB 45" is a marker for which of the following?

A. Sarcoma
B. Melanoma (Correct Answer)
C. Carcinoma
D. None of the above

Explanation: **Explanation:** **HMB-45 (Human Melanoma Black-45)** is a monoclonal antibody that reacts against a specific antigen located in the **melanosomes** (specifically the gp100 glycoprotein). It is highly specific for cells showing melanocytic differentiation. 1. **Why Melanoma is correct:** HMB-45 is one of the most specific markers for **Malignant Melanoma** [1]. It stains activated or neoplastic melanocytes but is typically negative in normal adult resting melanocytes (except for fetal control). It is particularly useful in identifying amelanotic melanomas that lack visible pigment [1]. 2. **Why other options are incorrect:** * **Sarcoma:** These are tumors of mesenchymal origin. Common markers include **Vimentin** (universal), Desmin (muscle), or CD31 (vascular). * **Carcinoma:** These are tumors of epithelial origin. The hallmark immunohistochemical (IHC) marker for carcinomas is **Cytokeratin (CK)**. **High-Yield Clinical Pearls for NEET-PG:** * **Other Melanoma Markers:** * **S-100:** Highly sensitive but lacks specificity (also positive in neural tumors, Langerhans cells, and cartilage). It is usually the first screening marker used. * **Melan-A (MART-1):** Another highly specific marker for melanocytic lineage. * **SOX-10:** A nuclear marker gaining popularity for its high sensitivity in both primary and metastatic melanoma. * **Diagnostic Utility:** In a "Round Cell Tumor" or "Undifferentiated Tumor" workup, a panel including CK (Carcinoma), Vimentin (Sarcoma), LCA (Lymphoma), and S-100/HMB-45 (Melanoma) is standard. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Skin, pp. 1151-1152.

Question 493: Which of the following is a poor prognostic factor for melanoma?

A. Size of tumour
B. Spread to lymphatics (Correct Answer)
C. Shape
D. Colour of tumour

Explanation: **Explanation:** In the staging and prognosis of malignant melanoma, the most significant factor for predicting overall survival and disease progression is the **status of regional lymph nodes** [1]. **1. Why "Spread to lymphatics" is correct:** The presence of nodal metastasis (lymphatic spread) indicates that the tumor has gained the ability to disseminate beyond the primary site. According to the AJCC (American Joint Committee on Cancer) staging, nodal involvement automatically moves the patient to Stage III, which significantly decreases the 5-year survival rate compared to localized disease (Stage I/II) [2]. The **Sentinel Lymph Node Biopsy (SLNB)** is the gold standard for assessing this prognostic factor [1], [2]. **2. Why the other options are incorrect:** * **Size of tumor:** Unlike many other solid tumors, the horizontal diameter (size) of a melanoma is not a primary prognostic indicator. Instead, the **Breslow Thickness** (vertical depth in millimeters) is the most important local prognostic factor [2]. * **Shape and Colour:** These are clinical diagnostic criteria (part of the **ABCDE** mnemonic: Asymmetry, Border irregularity, Color variegation, Diameter >6mm, Evolving) [1]. While they help in identifying a suspicious lesion, they do not determine the clinical prognosis or survival outcome. **High-Yield Clinical Pearls for NEET-PG:** * **Most important prognostic factor (Overall):** Lymph node involvement [1]. * **Most important local prognostic factor:** Breslow Thickness (measured from the granular layer of the epidermis to the deepest tumor cell) [2]. * **Clark’s Level:** Based on anatomical layers (obsolete but still asked; Breslow is superior). * **Ulceration:** The presence of histological ulceration is the second most important local prognostic factor after thickness. * **Regression:** Spontaneous disappearance of parts of the tumor is actually a *poor* prognostic sign as it often indicates an immune response after micrometastasis has already occurred. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Skin, pp. 1151-1152. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Disorders Involving Inflammatory And Haemopoietic Cells, pp. 650-651.

Question 494: Which of the following are suspected carcinogens for bladder carcinoma?

A. Phenacitin
B. Tobacco
C. Aniline dye
D. All the above (Correct Answer)

Explanation: Bladder carcinoma (most commonly **Urothelial/Transitional Cell Carcinoma**) is strongly associated with exposure to specific environmental and chemical carcinogens that are excreted via the urinary tract. [1] ### **Explanation of Options:** * **Tobacco (Smoking):** This is the **most important risk factor**, accounting for approximately 50% of cases. Carcinogens like **2-naphthylamine** and polycyclic aromatic hydrocarbons are absorbed from cigarette smoke into the blood and concentrated in the urine, leading to "field cancerization" of the urothelium. [1][2] * **Aniline Dyes (Arylamines):** Occupational exposure in the rubber, chemical, and leather industries is a classic risk factor. Specific compounds like **benzidine** and **2-naphthylamine** are potent bladder carcinogens. [1][2] * **Phenacetin:** Long-term use of this analgesic (now largely withdrawn) is linked to an increased risk of urothelial carcinoma of the **renal pelvis** and bladder. It acts as a direct irritant and mutagen during excretion. Since all three factors are established carcinogens for the urinary tract, **Option D (All the above)** is correct. ### **High-Yield Clinical Pearls for NEET-PG:** * **Schistosoma haematobium:** A major risk factor for **Squamous Cell Carcinoma** of the bladder (common in Egypt/Middle East) due to chronic irritation. [1] * **Cyclophosphamide:** An alkylating agent used in chemotherapy that increases the risk of bladder cancer (prevented by **MESNA**). * **Painless Hematuria:** The most common presenting symptom of bladder cancer in an elderly male smoker. * **Genetic Mutation:** Mutations in the **FGFR3** and **TP53** genes are frequently implicated in the pathogenesis of urothelial tumors. **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. 967-970. [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. 217-218.

Question 495: Retinoblastoma can result from a mutation in:

A. Ras proto-oncogene
B. ErbB proto-oncogene
C. p 53 gene
D. RB 1 gene (Correct Answer)

Explanation: **Explanation:** **1. Why RB 1 gene is correct:** Retinoblastoma is caused by a mutation in the **RB1 gene**, located on **chromosome 13q14** [1]. The RB gene was the first tumor suppressor gene discovered and is the classic example of **Knudson’s "Two-Hit" Hypothesis** [1][2]. The RB protein (pRB) acts as a "molecular brake" on the cell cycle. In its hypophosphorylated state, it binds to the **E2F transcription factor**, preventing the cell from progressing from the G1 to the S phase [1]. Loss of both alleles leads to uncontrolled cell proliferation, resulting in Retinoblastoma. **2. Why other options are incorrect:** * **Ras proto-oncogene:** This is the most common oncogene in human tumors (e.g., pancreatic and colon cancers). It encodes a GTP-binding protein involved in signal transduction, not the direct pathogenesis of Retinoblastoma. * **ErbB proto-oncogene:** This family (e.g., ERBB2/HER2) encodes receptor tyrosine kinases. Overexpression is typically associated with breast and gastric carcinomas. * **p53 gene:** Known as the "Guardian of the Genome," it is the most frequently mutated gene in human cancer (e.g., Li-Fraumeni syndrome) [2]. While it regulates apoptosis and the cell cycle, it is not the primary driver for Retinoblastoma. **3. High-Yield Clinical Pearls for NEET-PG:** * **Inheritance:** Familial cases (40%) are usually bilateral and follow an autosomal dominant pattern (though the mutation is recessive at the cellular level) [1]. Sporadic cases (60%) are typically unilateral. * **Histology:** Look for **Flexner-Wintersteiner rosettes** (specific) and Homer Wright rosettes (non-specific). * **Clinical Sign:** The most common presenting sign is **Leukocoria** (white pupillary reflex). * **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, pp. 297-301. [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.

Question 496: What is the least common site for the spread of melanoma?

A. Gastrointestinal tract (GIT)
B. Lungs
C. Liver
D. Kidney (Correct Answer)

Explanation: **Explanation:** Malignant melanoma is notorious for its unpredictable and aggressive metastatic behavior. It is one of the few tumors that can metastasize to almost any organ in the body [3], including unusual sites like the heart and small intestine. **Why Kidney is the Correct Answer:** While melanoma can technically spread to the kidneys (usually as part of widespread terminal dissemination), the **kidney is statistically the least common site** among the options provided. Melanoma has a peculiar tropism for specific visceral organs, and while renal involvement is seen in autopsy series, it is rarely a clinically significant or primary site of visceral metastasis compared to the GIT, lungs, or liver. **Analysis of Incorrect Options:** * **Lungs (Option B):** This is the **most common site** of visceral metastasis for melanoma [1]. Hematogenous spread frequently leads to "cannonball" or multiple pulmonary nodules. * **Liver (Option C):** The liver is a very frequent site of metastasis, often associated with a poor prognosis [1]. It is the second most common visceral site after the lungs. * **Gastrointestinal Tract (Option A):** Melanoma is the **most common secondary tumor to involve the GIT** [3]. It specifically favors the small intestine. This is a high-yield fact, as most other primary cancers do not metastasize to the bowel. **NEET-PG High-Yield Pearls:** * **Most common site of metastasis:** Regional lymph nodes [2]. * **Most common visceral site:** Lungs [1]. * **Most common site for "Ocular Melanoma" metastasis:** Liver. * **Unique Fact:** Melanoma is the most common tumor to metastasize to the **heart** and the **small intestine**. * **S-100, HMB-45, and Melan-A** are the key immunohistochemical (IHC) markers used for diagnosis [2]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, p. 282. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Skin, pp. 1151-1152. [3] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Disorders Involving Inflammatory And Haemopoietic Cells, pp. 650-651.

Question 497: A 50-year-old female patient presented with swelling of the left upper limb with characteristic skin lesions. She has a history of undergoing Modified Radical Mastectomy (MRM) followed by chemotherapy and radiotherapy 7 years ago. A skin biopsy was taken. Which of the following markers would be most likely positive in this patient?

A. CD31 (Correct Answer)
B. CD30
C. CD117
D. CD45

Explanation: ### Explanation **Diagnosis: Stewart-Treves Syndrome (Post-mastectomy Angiosarcoma)** The clinical presentation describes a classic case of **Stewart-Treves Syndrome**. This refers to the development of **angiosarcoma** in the setting of chronic lymphedema, most commonly occurring in the upper limb of a female patient several years after a Modified Radical Mastectomy (MRM) with axillary lymph node dissection. **Why CD31 is the correct answer:** Angiosarcoma is a malignant neoplasm of endothelial cells. **CD31 (PECAM-1)** is the most sensitive and specific diagnostic marker for vascular tumors as it is expressed on the surface of endothelial cells [1]. Other positive markers would include **CD34** and **Factor VIII-related antigen (von Willebrand factor)** [1]. **Analysis of Incorrect Options:** * **B. CD30:** This is a marker for Reed-Sternberg cells in Hodgkin Lymphoma, Anaplastic Large Cell Lymphoma (ALCL), and Embryonal Carcinoma. It has no role in vascular tumors. * **C. CD117 (c-KIT):** This is the characteristic marker for Gastrointestinal Stromal Tumors (GIST), Mastocytosis, and Seminoma. * **D. CD45 (LCA):** Known as Leukocyte Common Antigen, it is a pan-hematopoietic marker used to identify lymphomas and leukemias. **Clinical Pearls for NEET-PG:** * **Latency:** Stewart-Treves syndrome typically occurs **5–10 years** after mastectomy. * **Appearance:** Presents as persistent "bruise-like" purple-red nodules or plaques on a lymphedematous limb [1]. * **Risk Factors:** Chronic lymphedema is the primary trigger; radiotherapy (post-radiation angiosarcoma) can also contribute. * **High-Yield Markers for Angiosarcoma:** CD31 (Best), CD34, ERG (highly specific nuclear marker), and FLI-1. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of Infancy and Childhood, pp. 527-528.

Question 498: All are true regarding foregut carcinoid tumors, except?

A. Foregut tumors generally have a low serotonin content.
B. Argentaffin-negative but argyrophilic.
C. Often multifactorial.
D. Bone metastasis is not a feature. (Correct Answer)

Explanation: **Explanation:** Carcinoid tumors are neuroendocrine neoplasms derived from the diffuse endocrine system [1]. They are traditionally classified based on their embryological site of origin: **Foregut** (respiratory tract, stomach, duodenum, pancreas), **Midgut** (jejunum, ileum, ascending colon), and **Hindgut** (distal colon, rectum). **1. Why Option D is the Correct Answer (The False Statement):** Contrary to the option, **bone metastasis is a recognized feature** of foregut carcinoids. While carcinoids generally have a slow growth pattern, foregut tumors (especially bronchial carcinoids) are known to metastasize to the liver and bones. Bone metastases from carcinoids are typically **osteoblastic** in nature. **2. Analysis of Incorrect Options (True Statements):** * **Option A:** Foregut carcinoids generally have **low serotonin content**. Because they often lack the enzyme *aromatic L-amino acid decarboxylase*, they produce 5-hydroxytryptophan (5-HTP) rather than serotonin (5-HT). Thus, they rarely cause classic Carcinoid Syndrome unless they metastasize. * **Option B:** These tumors are typically **Argentaffin-negative but Argyrophilic**. This means they cannot reduce silver salts on their own (argentaffin negative) but can do so in the presence of an external reducing agent (argyrophilic). * **Option C:** Foregut carcinoids, particularly gastric ones, are often **multifactorial** [1]. They frequently arise in the setting of chronic atrophic gastritis or MEN-1 syndrome due to hypergastrinemia-induced hyperplasia of ECL cells [1]. **High-Yield NEET-PG Pearls:** * **Most common site of Carcinoid:** Appendix (historically), but recent data suggests the Small Intestine/Rectum are increasingly common [1]. * **Carcinoid Syndrome:** Occurs only when tumor products bypass hepatic metabolism (e.g., liver metastasis or primary bronchial carcinoid) [2]. * **Diagnosis:** 24-hour urinary **5-HIAA** (metabolite of serotonin) and **Chromogranin A** (serum marker). * **Histology:** Classic "salt and pepper" chromatin with nests of uniform polygonal cells [2]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, pp. 780-781. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, pp. 781-782.

Question 499: HMB45 is a marker for which of the following?

A. Melanoma (Correct Answer)
B. Synovial sarcoma
C. Rhabdomyosarcoma
D. Neurofibroma

Explanation: **Explanation:** **HMB-45 (Human Melanoma Black-45)** is a monoclonal antibody that reacts against **gp100**, a specific oncofetal antigen found in **melanosomes**. It is highly specific for cells showing melanocytic differentiation. In clinical pathology, it is a primary immunohistochemical (IHC) marker used to confirm the diagnosis of **Melanoma**, particularly when the tumor is amelanotic or poorly differentiated [1]. **Analysis of Options:** * **A. Melanoma (Correct):** HMB-45 is highly specific for activated or neoplastic melanocytes [1]. While S100 is more sensitive for melanoma, HMB-45 is more specific. * **B. Synovial sarcoma:** Characterized by a (X;18) translocation. Key markers include **TLE1**, Cytokeratin, and EMA. * **C. Rhabdomyosarcoma:** A skeletal muscle tumor. Key markers include **Desmin, Myogenin (Myf4), and MyoD1**. * **D. Neurofibroma:** A benign nerve sheath tumor. While it may express **S100**, it does not contain melanosomes and is negative for HMB-45. **NEET-PG High-Yield Pearls:** * **Melanoma Marker Hierarchy:** * **S100:** Most sensitive (best for screening/ruling out). * **HMB-45 & Melan-A (MART-1):** Highly specific (best for confirming). * **SOX10:** Excellent marker for both primary and metastatic melanoma. * **Exceptions:** HMB-45 can also be positive in **PEComas** (Perivascular Epithelioid Cell tumors), such as **Angiomyolipoma** (AML) of the kidney and Lymphangioleiomyomatosis (LAM). * **Desmoplastic Melanoma:** Often characteristically **negative** for HMB-45 and Melan-A, but positive for S100/SOX10. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Skin, pp. 1151-1152.

Question 500: Which of the following is the primary tumor marker for hepatocellular carcinoma?

A. Alpha-fetoprotein (AFP) (Correct Answer)
B. Carcinoembryonic antigen (CEA)
C. Human chorionic gonadotropin (HCG)
D. Carbohydrate antigen 19-9 (CA-19)

Explanation: **Explanation:** **Alpha-fetoprotein (AFP)** is the primary and most widely used tumor marker for **Hepatocellular Carcinoma (HCC)** [1], [2]. AFP is a glycoprotein normally synthesized by the fetal liver and yolk sac. In adults, levels are typically negligible; however, they rise significantly in HCC due to the dedifferentiation of hepatocytes into a fetal-like state. For NEET-PG, remember that while AFP is sensitive, it can also be elevated in non-seminomatous germ cell tumors (Yolk sac tumors) and benign conditions like cirrhosis or chronic hepatitis [1], [2]. **Analysis of Incorrect Options:** * **Carcinoembryonic Antigen (CEA):** Primarily used for monitoring **Colorectal Carcinoma** [2]. It is also elevated in pancreatic, gastric, and breast cancers, but is not specific for HCC [2]. * **Human Chorionic Gonadotropin (HCG):** The hallmark marker for **Choriocarcinoma** and hydatidiform moles. It is also elevated in certain germ cell tumors (e.g., seminoma, dysgerminoma). * **CA 19-9:** The primary marker for **Pancreatic Adenocarcinoma** and cholangiocarcinoma (bile duct cancer). **High-Yield Clinical Pearls for NEET-PG:** * **Diagnostic Threshold:** In a patient with cirrhosis, an AFP level **>400 ng/mL** combined with characteristic imaging (e.g., arterial enhancement and venous wash-out on CT/MRI) is highly suggestive of HCC. * **Fibrolamellar Variant:** A rare subtype of HCC occurring in young adults without cirrhosis; notably, **AFP levels are usually normal** in these patients. * **Other HCC Markers:** DCP (Des-gamma-carboxy prothrombin) and Glypican-3 are emerging 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.

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