Neoplasia Practice Questions

Q: What is the most important indicator of malignancy in smooth muscle tumors?

Mitotic index. In the evaluation of smooth muscle tumors (Leiomyoma vs. Leiomyosarcoma), the distinction between benign and malignant is based on a constellation of histological features. [1] **Why Mitotic Index is the Correct Answer:** The **mitotic index** (number of mitoses per 10 High Power Fields) is the most reliable and objective indicator of malignancy. For uterine smooth muscle tumors, a mitotic count of **>10 mitoses per 10 HPF** is generally diagnostic of Leiomyosarcoma, even in the absence of other features. [1] If cellular atypia or necrosis is present, the threshold for the mitotic index required to diagnose malignancy decreases (usually >5 mitoses per 10 HPF). **Explanation of Incorrect Options:** * **B. Atypia:** While nuclear pleomorphism and atypia are common in malignancies, they can be seen in benign variants like "Symplastic Leiomyoma" (Bizarre Leiomyoma). Thus, atypia alone is not definitive. * **C. Necrosis:** Specifically, **Coagulative Tumor Cell Necrosis** is a strong indicator of malignancy. [1] However, simple hyaline or infarct-type necrosis is common in benign leiomyomas due to rapid growth or torsion. * **D. Cellularity:** Increased cellularity is seen in "Cellular Leiomyomas," which remain benign despite being more densely packed than the surrounding myometrium. **High-Yield NEET-PG Pearls:** * **The Triad of Malignancy:** Diagnosis of Leiomyosarcoma usually requires at least two of the following: (1) High mitotic index, (2) Diffuse nuclear atypia, and (3) Coagulative tumor cell necrosis. [1] * **Origin:** Unlike many other cancers, Leiomyosarcomas typically arise **de novo** and NOT from pre-existing leiomyomas. * **Epidemiology:** They are most common in postmenopausal women, whereas leiomyomas are estrogen-dependent and common in the reproductive age group. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Female Genital Tract, pp. 1024-1025.

Q: Which of the following is not a risk factor for transitional cell carcinoma of the urinary bladder?

None of the above. **Explanation:** The correct answer is **None of the above** because all three options listed (Smoking, Schistosomiasis, and Aniline dyes) are established risk factors for the development of bladder cancer [1]. 1. **Smoking (Option A):** This is the **most significant risk factor** for Transitional Cell Carcinoma (TCC), also known as Urothelial Carcinoma [1]. Cigarette smoke contains naphthylamine and polycyclic aromatic hydrocarbons which are excreted in urine and act as direct carcinogens on the urothelium. 2. **Schistosomiasis (Option B):** Infection with *Schistosoma haematobium* is a major risk factor. While it is most classically associated with **Squamous Cell Carcinoma (SCC)** due to chronic irritation and squamous metaplasia, it also significantly increases the overall risk of **Transitional Cell Carcinoma** in endemic areas [1]. 3. **Aniline Dyes (Option C):** Occupational exposure to aromatic amines (found in rubber, chemical, and leather industries) is a classic high-yield risk factor [1]. Specifically, **2-naphthylamine** and benzidine are potent urothelial carcinogens. **Clinical Pearls for NEET-PG:** * **Most common type:** In the developed world, TCC is the most common bladder cancer (>90%). * **Classic Presentation:** Painless gross hematuria in an elderly male. * **Cyclophosphamide:** This chemotherapy agent is a known risk factor for TCC; the risk can be mitigated by administering **MESNA**. * **Field Cancerization:** This concept explains why TCC is often multifocal; the entire urothelial lining is exposed to the same urinary carcinogens, leading to multiple independent primary tumors. * **Phenacetin:** Long-term use of this analgesic (now largely banned) is also a documented risk factor. **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. 968-970.

Q: What are the characteristic margins of squamous cell carcinoma?

Everted. **Explanation:** The characteristic margin of **Squamous Cell Carcinoma (SCC)** is **everted (turned outward)**. This occurs because the malignant epithelial cells at the edge of the ulcer undergo rapid, uncontrolled proliferation [1]. This excessive growth at the periphery causes the edges to spill over the surrounding normal skin, creating a "heaped-up" or cauliflower-like appearance [2]. **Analysis of Options:** * **Everted (Correct):** Typical of rapidly growing malignant epithelial tumors like SCC [1]. The exuberant growth of neoplastic cells at the margins pushes the edges outward. * **Rolled (Incorrect):** This is the hallmark of **Basal Cell Carcinoma (BCC)**. The margins appear pearly, translucent, and beaded due to the slow, radial spread of tumor nests beneath the epidermis. * **Undermined (Incorrect):** Characteristic of **Tuberculosis (TB) ulcers**. The infection destroys the subcutaneous tissue faster than the overlying skin, leaving the edges hanging over the ulcer base. * **Inverted (Incorrect):** These margins are seen in **Trophic ulcers** (e.g., pressure sores or diabetic ulcers), where there is a lack of healing and the edges punch inward. **High-Yield Clinical Pearls for NEET-PG:** * **SCC Histology:** Look for "Keratin pearls" and "Intercellular bridges" (desmosomes) [1]. * **Precursor Lesions:** Actinic keratosis and Bowen’s disease are common precursors [1]. * **Marjolin’s Ulcer:** A specific type of SCC arising in chronic scars or long-standing burn wounds; it is notoriously aggressive [1]. * **Punch-out edges:** Classically seen in **Syphilitic (gummatous) ulcers**. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Disorders Involving Inflammatory And Haemopoietic Cells, pp. 643-645. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Skin, p. 1158.

Q: Deletion of chromosome 11 leads to which of the following conditions?

Wilms tumor. **Explanation:** **Correct Option: A. Wilms tumor** Wilms tumor (Nephroblastoma) is the most common primary renal tumor of childhood [1]. Its pathogenesis is strongly linked to the **WT1 (Wilms Tumor 1) gene**, which is located on **chromosome 11p13** [1]. Deletions or mutations in this region lead to the development of the tumor. Furthermore, the **WT2 gene**, associated with Beckwith-Wiedemann syndrome, is located on **chromosome 11p15.5**. The loss of tumor suppressor genes on chromosome 11 is a classic driver for both sporadic and syndromic Wilms tumor (e.g., WAGR syndrome) [1]. **Incorrect Options:** * **B. Neuroblastoma:** This is associated with the amplification of the **N-MYC** proto-oncogene (chromosome 2p) and deletions of the short arm of **chromosome 1**. * **C. Retinoblastoma:** This is caused by a mutation or deletion of the **RB1 gene**, which is located on **chromosome 13q14**. * **D. Osteosarcoma:** While complex genetically, it is most famously associated with mutations in the **RB1 (13q14)** and **TP53 (17p13)** genes. **High-Yield Clinical Pearls for NEET-PG:** * **WAGR Syndrome:** Wilms tumor, Aniridia, Genitourinary anomalies, and mental Retardation (associated with 11p13 deletion) [1]. * **Denys-Drash Syndrome:** Wilms tumor, Gonadal dysgenesis, and early-onset nephropathy (WT1 mutation). * **Beckwith-Wiedemann Syndrome (BWS):** Characterized by macroglossia, organomegaly, and hemihypertrophy; linked to the WT2 locus on 11p15.5 (genomic imprinting). * **Histology:** Look for the "triphasic" pattern—blastemal, stromal, and epithelial cells. **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.

Question 1

All of the following statements are true about tumor suppressor gene TP53, except?

Accepted Answer

Activity in the cells decreases following UV irradiation and stimulates cell cycle.

Answer

Regulates genes involved in cell cycle regulation.

Answer

Increased levels can induce apoptosis.

Answer

Inherited TP53 mutations give rise to Li-Fraumeni syndrome.

Question 2

All of the following are angiogenic factors EXCEPT?

Accepted Answer

IFN

Answer

VEGF

Answer

PDGF

Answer

TGF-β

Question 3

What is the most common mutation associated with male breast carcinoma?

Accepted Answer

BRCA 2

Answer

BRCA 1

Answer

p53

Answer

CDH 1

Question 4

What is the most important indicator of malignancy in smooth muscle tumors?

Accepted Answer

Mitotic index

Answer

Atypia

Answer

Necrosis

Answer

Cellularity

Question 5

Tubular (Canalicular) adenoma most commonly occurs on which of the following locations?

Accepted Answer

Upper lip

Answer

Palate

Answer

Lower lip

Answer

Gingiva

Question 6

Migratory thrombophlebitis is a classic paraneoplastic syndrome associated with which type of malignancy?

Accepted Answer

Pancreatic cancer

Answer

Bladder cancer

Answer

Breast cancer

Answer

Liver cancer

Question 7

Which of the following is not a risk factor for transitional cell carcinoma of the urinary bladder?

Accepted Answer

None of the above

Answer

Smoking

Answer

Schistosomiasis

Answer

Aniline dye

Question 8

What are the characteristic margins of squamous cell carcinoma?

Accepted Answer

Everted

Answer

Inverted

Answer

Rolled

Answer

Undermined

Question 9

Melanoma is:

Accepted Answer

A malignant tumor of skin and mucous membrane.

Answer

A benign tumor of skin and mucous membrane.

Answer

A malignant tumor of melanophores.

Answer

A benign tumor of melanophores.

Question 10

Deletion of chromosome 11 leads to which of the following conditions?

Accepted Answer

Wilms tumor

Answer

Neuroblastoma

Answer

Retinoblastoma

Answer

Osteosarcoma

Neoplasia — MCQs

Neoplasia — MCQs

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