Neoplasia — MCQs

Neoplasia Indian Medical PG Practice Questions and MCQs

Question 391: What is true about carcinoembryonic antigen (CEA)?

A. Useful for screening of carcinoma of the colon (Correct Answer)
B. Gives confirmative evidence of carcinoma of the colon
C. Helpful for follow-up after resection
D. Levels decrease immediately after resection of the tumour

Explanation: **Explanation:** Carcinoembryonic Antigen (CEA) is a complex glycoprotein normally produced during fetal development in the gastrointestinal tract and pancreas. In adults, it is a classic **oncofetal antigen** that becomes elevated in various adenocarcinomas, most notably colorectal carcinoma [1]. **1. Why Option A is the intended answer (Contextual Note):** In the context of traditional medical examinations, CEA is often associated with colorectal cancer screening protocols. However, it is crucial to note that modern clinical guidelines emphasize that CEA lacks the high sensitivity and specificity required for mass screening of the general population [1]. It is primarily "useful" in high-risk groups or as a supplementary tool. **2. Analysis of Incorrect Options:** * **Option B:** CEA is **not diagnostic**. Levels can be elevated in non-neoplastic conditions (e.g., ulcerative colitis, cirrhosis, heavy smoking) and other cancers (pancreas, breast, lung). Histopathology remains the gold standard for confirmation. * **Option C:** While CEA is used for monitoring, the question asks for the "most true" statement regarding its general utility in the context of the disease's presence. (Note: In many clinical settings, Option C is actually considered the *most* correct use of CEA; however, if Option A is marked correct in your specific curriculum, it refers to its role in early detection/screening). * **Option D:** CEA levels do not drop "immediately." It takes approximately **4 to 6 weeks** for CEA levels to return to baseline after successful surgical resection due to its metabolic half-life. **High-Yield Clinical Pearls for NEET-PG:** * **Primary Use:** The most reliable clinical use of CEA is **monitoring for recurrence** and assessing the **response to therapy** in known colorectal cancer patients. * **Prognosis:** Pre-operative CEA levels correlate with the clinical stage; very high levels often suggest metastatic disease (especially to the liver). * **Half-life:** Approximately 3–7 days. * **Other Associations:** Elevated in Medullary Carcinoma of the Thyroid (MTC) along with Calcitonin. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, p. 346.

Question 392: What is considered a dimorphic carcinoma?

A. Papillary carcinoma of the breast (Correct Answer)
B. Follicular carcinoma of the thyroid
C. Gastric adenocarcinoma
D. Endometrial carcinoma

Explanation: **Explanation:** The term **"dimorphic"** in pathology refers to the presence of two distinct cell populations or structural patterns within a single tumor. **1. Why Papillary Carcinoma of the Breast is correct:** Papillary carcinoma of the breast is characterized by a **dimorphic cell population**: it consists of neoplastic epithelial cells and a preserved (though sometimes attenuated) layer of **myoepithelial cells** [1]. In contrast to invasive ductal carcinomas, which lose the myoepithelial layer, non-invasive papillary lesions (like Encapsulated Papillary Carcinoma) maintain this dual-cell architecture. Furthermore, the term is sometimes used to describe the coexistence of two distinct morphological patterns (e.g., solid and papillary) within the same lesion [2]. **2. Why the other options are incorrect:** * **Follicular carcinoma of the thyroid:** This is a monomorphic tumor composed of follicular cells. Its diagnosis depends on capsular or vascular invasion, not a dual cell population. * **Gastric adenocarcinoma:** While it has subtypes (Lauren classification: Intestinal vs. Diffuse), individual tumors typically follow one dominant morphological lineage. * **Endometrial carcinoma:** Most are endometrioid type, consisting of a single layer of malignant epithelial cells forming glands, without a secondary cell population. **High-Yield NEET-PG Pearls:** * **Myoepithelial markers:** To confirm the dimorphic nature (presence of myoepithelial cells) in breast pathology, markers like **p63, SMA (Smooth Muscle Actin), and Calponin** are used. * **Psammoma bodies:** These are frequently seen in Papillary Carcinoma of the Thyroid and Ovary, but can also be seen in Papillary Carcinoma of the Breast. * **Differential:** Do not confuse "dimorphic" with "biphasic." Biphasic tumors (like Fibroadenoma or Synovial Sarcoma) contain both epithelial and mesenchymal components [2]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Breast, pp. 1068-1069. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of the Immune System, pp. 274-276.

Question 393: All of the following statements about Mucosa Associated Lymphoid Tissue (MALT) lymphomas are true, except:

A. Present at extranodal sites
B. Predisposed by H. pylori infection
C. Present as stromal polyps (Correct Answer)
D. Are sensitive to chemotherapy

Explanation: **Explanation:** **MALT Lymphoma (Extranodal Marginal Zone B-cell Lymphoma)** is a low-grade B-cell lymphoma arising from lymphoid tissue typically induced by chronic inflammation or autoimmunity [1], [2]. **Why Option C is the correct (incorrect statement) answer:** MALT lymphomas do not present as **stromal polyps**. Stromal polyps are non-neoplastic mesenchymal proliferations (e.g., fibroepithelial polyps). In contrast, MALTomas typically present as **diffuse mucosal infiltrates**, ulcers, or mass lesions [2]. Histologically, they are characterized by **lymphoepithelial lesions** (invasion of the glandular epithelium by neoplastic B-cells), not stromal proliferation [2]. **Analysis of other options:** * **Option A (Extranodal sites):** This is true. By definition, MALTomas occur at extranodal sites where lymphoid tissue is not normally present but is acquired (e.g., Stomach, Salivary glands, Thyroid, Lungs) [1], [2]. The **stomach** is the most common site [2]. * **Option B (H. pylori association):** This is true. Chronic infection with *H. pylori* leads to the formation of organized lymphoid tissue in the gastric mucosa [2]. The chronic antigenic stimulation drives the monoclonal proliferation of B-cells [2]. * **Option D (Sensitive to chemotherapy):** This is true. While early-stage gastric MALToma is often treated with antibiotic eradication of *H. pylori*, advanced or refractory cases are highly sensitive to chemotherapy (e.g., Chlorambucil, Cyclophosphamide) and immunotherapy (Rituximab) [3]. **High-Yield Clinical Pearls for NEET-PG:** * **Cytogenetics:** Most common translocation is **t(11;18)(q21;q21)** involving the *API2-MLT* gene [4]. This translocation is associated with resistance to *H. pylori* eradication therapy. * **Autoimmune associations:** Sjogren’s syndrome (Salivary gland MALToma) and Hashimoto’s thyroiditis (Thyroid MALToma) [1]. * **Immunophenotype:** CD19+, CD20+, CD22+, but **CD5- and CD10-** (helps differentiate from Mantle cell and Follicular lymphoma) [4]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of the Immune System, pp. 235-236. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Alimentary System Disease, pp. 356-357. [3] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Alimentary System Disease, pp. 357-358. [4] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Diseases Of The Urinary And Male Genital Tracts, pp. 566-567.

Question 394: All of the following are precancerous conditions except?

A. SLE (Correct Answer)
B. Peutz-Jeghers syndrome
C. Plummer-Vinson syndrome
D. Xeroderma pigmentosum

Explanation: ### Explanation The correct answer is **A. SLE (Systemic Lupus Erythematosus)**. In pathology, a **precancerous condition** is a clinical state associated with a significantly increased risk of developing cancer [3]. While SLE is a chronic multisystem autoimmune disease characterized by widespread inflammation and tissue damage [1], it is **not** classified as a precancerous condition. Although patients with SLE may have a slightly higher risk of certain malignancies (like Non-Hodgkin Lymphoma) due to chronic immune stimulation or immunosuppressive therapy [4], the disease itself does not follow a predictable progression to malignancy. **Analysis of Incorrect Options:** * **B. Peutz-Jeghers Syndrome:** An autosomal dominant disorder characterized by hamartomatous polyps in the GI tract and mucocutaneous hyperpigmentation. It is a known precancerous condition with a high risk of colorectal, pancreatic, breast, and ovarian cancers. * **C. Plummer-Vinson Syndrome:** Characterized by the triad of iron deficiency anemia, glossitis, and esophageal webs. It is a precursor to **Squamous Cell Carcinoma** of the post-cricoid region and esophagus. * **D. Xeroderma Pigmentosum:** An autosomal recessive defect in **nucleotide excision repair (DNA repair)** [2]. It is a classic precancerous condition leading to skin cancers (Basal Cell Carcinoma, Squamous Cell Carcinoma, and Melanoma) upon exposure to UV light [2]. **High-Yield Clinical Pearls for NEET-PG:** * **Precancerous Lesion vs. Condition:** A *lesion* is a localized change (e.g., Leukoplakia, CIN), whereas a *condition* is a generalized state (e.g., Ulcerative Colitis, Cirrhosis) [3]. * **Other High-Yield Precancerous Conditions:** Cirrhosis of liver (Hepatocellular Carcinoma), Ulcerative Colitis (Colorectal Cancer), and Paget’s disease of bone (Osteosarcoma) [4]. * **Xeroderma Pigmentosum** is frequently tested; remember the defect is in **Endonuclease** activity during DNA repair [2]. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Disorders Involving Inflammatory And Haemopoietic Cells, pp. 639-640. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, pp. 322-323. [3] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. (Basic Pathology) introduces the student to key general principles of pathology, both as a medical science and as a clinical activity with a vital role in patient care. Part 2 (Disease Mechanisms) provides fundamental knowledge about the cellular and molecular processes involved in diseases, providing the rationale for their treatment. Part 3 (Systematic Pathology) deals in detail with specific diseases, with emphasis on the clinically important aspects., pp. 222-223. [4] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, pp. 286-287.

Question 395: Which tumors are associated with tuberous sclerosis?

A. Renal angiomyoma
B. Subependymal giant cell astrocytoma
C. Rhabdomyoma
D. All the above (Correct Answer)

Explanation: **Explanation:** Tuberous Sclerosis Complex (TSC) is an autosomal dominant neurocutaneous syndrome caused by mutations in the **TSC1 (Hamartin)** or **TSC2 (Tuberin)** genes [1]. These genes normally inhibit the **mTOR pathway**; their mutation leads to constitutive activation of cell growth and the formation of hamartomas across multiple organ systems [1]. **Breakdown of Options:** * **Renal Angiomyolipoma (Option A):** These are the most common benign renal tumors in TSC patients [1]. They are composed of thick-walled blood vessels, smooth muscle, and adipose tissue. They are often bilateral and multicentric in TSC. * **Subependymal Giant Cell Astrocytoma (SEGA) (Option B):** These are low-grade (WHO Grade I) glial tumors typically located near the Foramen of Monro [1]. They are a classic CNS manifestation of TSC and can lead to obstructive hydrocephalus [1]. * **Cardiac Rhabdomyoma (Option C):** This is the most common primary cardiac tumor in infants and children [1]. In approximately 50-80% of cases, it is associated with Tuberous Sclerosis. These tumors often spontaneously regress over time. Since all three tumors are hallmark manifestations of the syndrome, **Option D** is the correct answer. **High-Yield Clinical Pearls for NEET-PG:** * **Vogt’s Triad:** Epilepsy, Intellectual disability, and Adenoma sebaceum (facial angiofibromas) [1]. * **Dermatological findings:** Ash-leaf spots (hypopigmented macules - earliest sign), Shagreen patches (connective tissue nevi), and Periungual fibromas (Koenen tumors). * **Pulmonary:** Lymphangioleiomyomatosis (LAM), primarily seen in females [1]. * **Imaging:** "Candle guttering" appearance on ventricles due to subependymal nodules [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Central Nervous System, pp. 1318-1319.

Question 396: Prognosis in a soft tissue tumour is determined by?

A. Grade of tumour (Correct Answer)
B. Bulk of the tumour
C. Depth of invasion
D. Lymph nodal involvement

Explanation: **Explanation:** In soft tissue sarcomas (STSs), the **histological grade** is the most critical prognostic factor. [1] Unlike many epithelial malignancies (carcinomas) where the stage (TNM) is paramount, the biological behavior of soft tissue tumors is primarily dictated by their differentiation, mitotic activity, and extent of necrosis. * **Why Grade is Correct:** The grading system (most commonly the **FNCLCC system**) evaluates three parameters: tumor differentiation, mitotic count, and necrosis. [1] A higher grade directly correlates with a higher risk of distant metastasis (usually hematogenous to the lungs) and decreased overall survival. * **Why others are incorrect:** * **Bulk of the tumour (Size):** While size is a component of staging (T), a small high-grade tumor often has a worse prognosis than a large low-grade tumor. * **Depth of invasion:** While deep-seated tumors (below the fascia) generally fare worse than superficial ones, depth is secondary to the histological grade in predicting outcome. * **Lymph nodal involvement:** Most soft tissue sarcomas spread **hematogenously**. [1] Lymphatic spread is rare (occurring in <5% of cases), making it a less reliable prognostic indicator compared to grade for the majority of STSs. **High-Yield Clinical Pearls for NEET-PG:** * **FNCLCC Grading System:** The most widely used system for STSs. * **Exceptions to Lymph Node Rule:** Remember the mnemonic **SCARE** for sarcomas that *do* frequently spread via lymphatics: **S**ynovial sarcoma, **C**lear cell sarcoma, **A**ngiosarcoma, **R**habdomyosarcoma, and **E**pithelioid sarcoma. * **Most common site of metastasis:** Lungs (via blood). * **Most common soft tissue sarcoma in adults:** Undifferentiated Pleomorphic Sarcoma (formerly MFH) or Liposarcoma. * **Most common soft tissue sarcoma in children:** Rhabdomyosarcoma. **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. 254-255.

Question 397: Which is the most common tumor caused by a virus?

A. Warts (Correct Answer)
B. Carcinoma of the cervix
C. Nasopharyngeal carcinoma
D. Lymphoma

Explanation: **Explanation:** The correct answer is **Warts (Verruca Vulgaris)**. **Why Warts is the correct answer:** While many viruses are oncogenic (cancer-causing), the question asks for the **most common** tumor. Warts are benign epithelial tumors caused by the **Human Papillomavirus (HPV)**, specifically types 1, 2, 4, and 7 [1]. In terms of global prevalence, benign viral-induced lesions like warts and molluscum contagiosum far outnumber malignant viral-associated cancers [1],[2]. In the context of pathology, "tumor" refers to any abnormal mass of tissue (neoplasm), whether benign or malignant. **Analysis of Incorrect Options:** * **B. Carcinoma of the cervix:** Also caused by HPV (primarily high-risk types 16 and 18) [1]. While it is a significant cause of cancer-related mortality, its incidence is much lower than that of common benign warts. * **C. Nasopharyngeal carcinoma:** Strongly associated with the **Epstein-Barr Virus (EBV)** [1]. It is endemic in certain regions (like Southern China) but is relatively rare globally compared to HPV-related lesions. * **D. Lymphoma:** Certain types (like Burkitt lymphoma or Primary CNS lymphoma) are associated with EBV or HIV, but most lymphomas are not viral in origin, and they occur less frequently than common warts [1],[3]. **High-Yield Clinical Pearls for NEET-PG:** * **HPV 6 & 11:** Cause Condyloma acuminatum (genital warts) and Laryngeal papillomas [1],[4]. * **HPV 16 & 18:** Most common causes of cervical, anal, and oropharyngeal squamous cell carcinomas [3]. * **EBV Associations:** Burkitt Lymphoma (t(8;14)), Hodgkin Lymphoma (Mixed cellularity), and Nasopharyngeal Carcinoma [1]. * **HHV-8:** Associated with Kaposi Sarcoma [3]. * **HBV/HCV:** Associated with Hepatocellular Carcinoma [1]. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. (Basic Pathology) introduces the student to key general principles of pathology, both as a medical science and as a clinical activity with a vital role in patient care. Part 2 (Disease Mechanisms) provides fundamental knowledge about the cellular and molecular processes involved in diseases, providing the rationale for their treatment. Part 3 (Systematic Pathology) deals in detail with specific diseases, with emphasis on the clinically important aspects., pp. 219-220. [2] Kumar v, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Female Genital Tract, pp. 997-998. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of the Immune System, pp. 261-262. [4] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Female Genital Tract, pp. 1000-1002.

Question 398: All of the following changes are seen in dysplasia of the squamo-columnar junction, except?

A. Breaking of the basement membrane (Correct Answer)
B. Change of epithelium
C. Hyperchromatic nuclei
D. Increased mitotic figures

Explanation: **Explanation:** The core concept tested here is the distinction between **dysplasia** and **carcinoma-in-situ** versus **invasive carcinoma**. **Why "Breaking of the basement membrane" is the correct answer:** Dysplasia is a disordered growth characterized by a loss of architectural orientation and cellular uniformity [1]. By definition, dysplasia is a **pre-invasive** condition. The basement membrane remains **intact** [2]. Once malignant cells breach the basement membrane and invade the underlying stroma, the lesion is no longer classified as dysplasia or carcinoma-in-situ; it becomes **invasive carcinoma** [1]. Therefore, breaking of the basement membrane is the hallmark of invasion, not dysplasia. **Analysis of Incorrect Options:** * **B. Change of epithelium:** Dysplasia often occurs in the setting of long-standing metaplasia (e.g., squamous metaplasia at the squamo-columnar junction of the cervix) [2]. It represents a transition from a normal cell type to an abnormal, disordered one. * **C. Hyperchromatic nuclei:** This is a classic cytological feature of dysplasia. Cells exhibit increased nuclear-to-cytoplasmic (N:C) ratio, dark-staining nuclei (hyperchromasia), and prominent nucleoli [1], [3]. * **D. Increased mitotic figures:** Dysplastic tissues show high proliferative activity [3]. Mitotic figures are not only increased in number but may also be found in abnormal locations (e.g., in the upper layers of the squamous epithelium rather than just the basal layer) [2]. **NEET-PG High-Yield Pearls:** * **Reversibility:** Unlike cancer, mild-to-moderate dysplasia is potentially **reversible** if the inciting stimulus (e.g., chronic irritation or infection) is removed [1]. * **Carcinoma-in-situ (CIS):** When dysplastic changes involve the full thickness of the epithelium but the basement membrane is intact, it is termed CIS [1]. * **Common Sites:** The squamo-columnar junction (Transformation Zone) of the cervix is the most common site for dysplasia, frequently associated with **High-risk HPV (16, 18)** [2], [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. 209-210. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Female Genital Tract Disease, pp. 467-470. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Female Genital Tract, pp. 1007-1008.

Question 399: In thymoma, all are seen except -

A. Hypogammaglobulinemia
B. Hyperalbuminemia (Correct Answer)
C. Red cell aplasia
D. Myasthenia Gravis

Explanation: ### Explanation Thymoma is a neoplasm of thymic epithelial cells and is famously associated with various **paraneoplastic syndromes** due to the thymus's central role in immune tolerance and T-cell maturation. **Why Hyperalbuminemia is the Correct Answer:** Hyperalbuminemia is not a feature of thymoma. In fact, thymomas are often associated with **hypoalbuminemia** if they occur alongside protein-losing conditions or chronic inflammatory states. Hyperalbuminemia is rarely a primary clinical finding in any pathology, usually indicating dehydration rather than a neoplastic process. **Analysis of Other Options:** * **Myasthenia Gravis (Option D):** This is the most common association, seen in approximately 30–50% of thymoma patients [1], [2]. It is caused by autoantibodies against acetylcholine receptors (AChR) at the neuromuscular junction [1], [2]. * **Pure Red Cell Aplasia (Option C):** About 5–15% of patients with thymoma develop PRCA. It is characterized by a selective maturation arrest of erythroid precursors in the bone marrow. * **Hypogammaglobulinemia (Option A):** Also known as **Good Syndrome**, this triad consists of thymoma, hypogammaglobulinemia, and increased susceptibility to infections. **NEET-PG High-Yield Pearls:** * **Most common mediastinal tumor:** Thymoma (specifically in the anterior mediastinum). * **Good Syndrome:** Thymoma + Hypogammaglobulinemia (distinct from DiGeorge Syndrome). * **Staging:** The **Masaoka Staging System** is used to determine the clinical extent and prognosis of thymomas. * **Histology:** Look for a "dual population" of neoplastic epithelial cells and non-neoplastic reactive T-lymphocytes. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of the Immune System, pp. 213-214. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Peripheral Nerves and Skeletal Muscles, pp. 1237-1238.

Question 400: Which of the following tumors demonstrates increased activity of C-KIT?

A. Granulosa cell tumor
B. Embryonal carcinoma
C. Seminoma (Correct Answer)
D. Choriocarcinoma

Explanation: ### Explanation **Correct Answer: C. Seminoma** **Mechanism:** **C-KIT (CD117)** is a proto-oncogene that encodes a transmembrane tyrosine kinase receptor. Its ligand is the stem cell factor (SCF). In the context of germ cell tumors, C-KIT is a highly sensitive and specific marker for **Seminoma** [1] (and its ovarian counterpart, Dysgerminoma [2]). Approximately 95-100% of seminomas show strong, diffuse membranous staining for C-KIT [1]. Mutations in the *KIT* gene lead to constitutive activation of the receptor, driving cell proliferation and survival [2]. **Analysis of Incorrect Options:** * **A. Granulosa cell tumor:** This is a sex cord-stromal tumor. Its hallmark molecular marker is the **FOXL2** mutation. It typically expresses Inhibin and Calretinin, not C-KIT. * **B. Embryonal carcinoma:** While a germ cell tumor, it is typically **C-KIT negative**. It is characterized by markers like **CD30**, SOX2, and OCT4 [1]. This distinction is vital for differentiating it from seminoma in mixed germ cell tumors. * **D. Choriocarcinoma:** This trophoblastic tumor expresses **hCG** (human chorionic gonadotropin) and GATA3 [1]. It does not show increased C-KIT activity. **High-Yield Clinical Pearls for NEET-PG:** * **C-KIT (CD117) Positive Tumors:** Remember the mnemonic **"G-S-M"**: **G**IST (Gastrointestinal Stromal Tumor - most common), **S**eminoma/Dysgerminoma, and **M**astocytosis (or Melanoma/AML). * **Seminoma Markers:** Positive for **C-KIT (CD117)**, **OCT3/4**, and **SALL4** [1]. They are characteristically **negative for CD30** and **Cytokeratin** (unlike Embryonal Carcinoma). * **Treatment Note:** The discovery of C-KIT mutations led to the use of Tyrosine Kinase Inhibitors like **Imatinib** in refractory cases of GIST and certain other C-KIT positive malignancies [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. 980-982. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Female Genital Tract, pp. 1034-1035.

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