Neoplasia Practice Questions

Q: In the context of solid tumors, which is the most common site of metastasis?

Lung. ***Lung*** - The **lungs** are the most common site of metastasis for solid tumors overall due to their unique position in receiving 100% of the systemic venous return via the pulmonary circulation. - This makes the lungs the **first capillary bed** encountered by tumor cells entering the venous system from most primary sites. - Common primary tumors metastasizing to lung include **breast, colon, kidney, sarcomas, melanoma, head and neck, and thyroid cancers** [2]. - Found in approximately **30-40% of all cancer deaths** at autopsy. *Liver* - The **liver** is the **second most common** site for metastasis, particularly for gastrointestinal malignancies [1]. - Its dual blood supply (hepatic artery and portal vein) makes it highly susceptible, especially for tumors draining via the **portal circulation** (colon, pancreas, stomach). - Also a common site for breast, lung, and melanoma metastases. - Found in approximately 30-35% of cancer deaths at autopsy. *Bone* - **Bone metastases** are common with specific tumor types: breast, prostate, lung, kidney, and thyroid [3]. - While causing significant morbidity (pain, fractures, hypercalcemia), bone is **less frequent overall** compared to lung or liver when considering all solid tumors. *Brain* - **Brain metastases** occur primarily with lung cancer, breast cancer, melanoma, and renal cell carcinoma [1]. - The **blood-brain barrier** provides some protection, making brain a less common site overall. - Significant clinical impact but lower overall frequency compared to lung and liver. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Lung, pp. 724-725. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Respiratory Tract Disease, pp. 338-339. [3] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Osteoarticular And Connective Tissue Disease, pp. 671-672.

Q: Which of the following tumors is not associated with an infective etiology?

Non-small cell lung carcinoma. ***Non-small cell carcinoma lung*** - This cancer type is primarily linked with **smoking** and environmental factors rather than infectious agents. - Unlike other listed cancers, it lacks a recognized **infective etiology** in its pathogenesis. *Gastric ca* - Strongly associated with **Helicobacter pylori** infection, which contributes to gastric mucosal changes [2]. - This bacteria is a known risk factor for the development of **gastric malignancies**. *Nasopharyngeal ca* - Frequently linked with **Epstein-Barr Virus (EBV)**, highlighting its infective associations [1]. - Characterized by symptoms such as **nasal obstruction** and **otitis media**, often seen in endemic forms. *Hepatocellular ca* - Closely related to **chronic hepatitis B and C infections**, representing a significant infective cause [3]. - The presence of viral antigens in liver tissue correlates with the development of **hepatocellular carcinoma**. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Head and Neck, pp. 744-745. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, pp. 348-350. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, pp. 336-337.

Q: Retinoblastoma is associated with:

Osteosarcoma. ***Osteosarcoma*** - Retinoblastoma is associated with **increased risk** of secondary malignancies, particularly **osteosarcoma**. - The relationship is due to **genetic predisposition** via alterations in the RB1 gene [1]. *Hepatocellular* - Hepatocellular carcinoma is primarily linked to **risk factors** like hepatitis infection and is not directly associated with retinoblastoma. - It does not share a **common genetic pathway** with retinoblastoma, making this option incorrect. *Osteoclastoma* - Osteoclastoma (giant cell tumor of bone) typically occurs in the **metaphysis of long bones** and does not relate to retinoblastoma. - There are no documented links between **genetic mutations** in retinoblastoma and osteoclastoma development. *SCC* - Squamous cell carcinoma (SCC) is more associated with **sun exposure** and certain viral infections, rather than retinoblastoma. - It lacks any **genetic relationship** or increased incidence linked to retinoblastoma, ruling this option out. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, pp. 298-300.

Q: Which of the following is NOT classified as a small round cell tumor?

Wilm's tumor. ***All of the above*** - Small round cell tumors encompass a variety of neoplasms including **retinoblastoma** and **rhabdomyosarcoma** [1]. - They are characterized by **primitive, undifferentiated cells**, making this classification broad and inclusive of all mentioned tumors. *Retinoblastoma (a small round cell tumor)* - While retinoblastoma is indeed a **small round cell tumor** [1], this option fails to recognize the broader classification of tumors in the question. - It doesn't encompass other key tumors that can also be categorized under the **small round cell tumor** umbrella. *Wilm's tumor (not a small round cell tumor)* - Wilm's tumor is classified as a **nephroblastoma**, featuring a distinct morphology that does not fit into the small round cell category. - Typically presents as a **pediatric abdominal mass** with **triphasic pathology**, unlike small round cell tumors which have a more uniform appearance. *Rhabdomyosarcoma (a small round cell tumor)* - Although rhabdomyosarcoma is considered a **small round cell tumor** [1][2], this option too does not cover all tumors classified under this term. - It features **mesenchymal differentiation** and uniform round cells with little cytoplasm [2] rather than presenting a broad view, as requested by the question. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of Infancy and Childhood, pp. 483-484. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Bones, Joints, and Soft Tissue Tumors, pp. 1224-1225.

Q: Which type of cancer is most commonly associated with perineural invasion in the head and neck region?

Adenoid cystic carcinoma. ***Adenoid cystic carcinoma*** - Perineural invasion is a hallmark feature of **adenoid cystic carcinoma**, particularly in the **head and neck region** [1]. - This cancer tends to infiltrate along nerve sheaths, which can lead to **pain and neurological symptoms** due to local invasion. *Adenocarcinoma* - While adenocarcinoma can exhibit invasiveness, it is not specifically characterized by **perineural invasion** as a consistent feature. - These tumors usually arise from **glandular tissues** and do not have the same propensity for nerve invasion. *Basal cell adenoma* - Basal cell adenoma is generally a **benign tumor**, which does not exhibit aggressive features like perineural invasion. - Most frequently, they present as localized masses without significant invasion into surrounding structures. *Squamous cell carcinoma* - Although squamous cell carcinoma can be aggressive, **perineural invasion** is less commonly identified compared to other malignancies like adenoid cystic carcinoma. - It primarily involves **keratinizing epithelial cells** and tends to invade adjacent tissues rather than along nerve pathways. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Head and Neck, pp. 753-755.

Q: The following gene mutation protects tumor cells from apoptosis:

Bcl-2. ***bcl-2*** - The **bcl-2 gene** produces a protein that inhibits apoptosis, thereby allowing tumor cells to evade programmed cell death [1][2]. - Overexpression of **bcl-2** is associated with various cancers, making it pivotal in cancer biology [1]. *RB* - The **RB gene** is primarily a tumor suppressor, regulating the cell cycle, and does not directly prevent apoptosis. - Loss of RB function leads to unregulated cell division rather than inhibition of cell death. *TGFβ* - **TGFβ** acts as a tumor suppressor and can induce apoptosis in certain contexts, particularly in oncogenic processes. - Its primary role involves regulating cell growth and differentiation, not directly protecting against apoptosis. *BRCA* - **BRCA genes** (BRCA1 and BRCA2) are involved in DNA repair mechanisms; mutations increase cancer susceptibility but do not prevent apoptosis directly. - Dysfunction in BRCA proteins primarily impacts the repair of DNA damage, leading to genomic instability rather than apoptosis resistance. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, pp. 310-311. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, p. 310.

Q: Which tumor marker is associated with both colon carcinoma and pancreatic carcinoma?

CA-19-9. ***CA-19-9*** - This **glycoprotein** tumor marker is commonly elevated in both **pancreatic adenocarcinoma** and, to a lesser extent, in **colorectal carcinoma**. - Its primary utility is in monitoring treatment response and recurrence, rather than as a screening tool, given its **low sensitivity and specificity**. *CA-125* - **CA-125** is primarily associated with **ovarian cancer** and is often used for screening high-risk individuals, monitoring treatment, and detecting recurrence. - While it can be elevated in other conditions like **endometriosis** or certain benign pelvic masses, it is not a primary marker for colon or pancreatic carcinoma. *CA-15-3* - **CA-15-3** is predominantly used as a tumor marker for **breast cancer**, particularly for monitoring disease progression and recurrence in metastatic cases. - It has limited utility in the diagnosis or management of colon or pancreatic malignancies. *None of the options* - This option is incorrect because **CA-19-9** is indeed a tumor marker associated with both colon and pancreatic carcinoma, making it the correct answer.

Q: Krukenberg tumors originate from:

Stomach. ***Stomach*** - **Krukenberg tumors** are **metastatic signet-ring cell adenocarcinomas** of the ovary. - The **stomach** is the **most common primary site** (70-80% of cases), particularly **gastric adenocarcinoma** [1]. - These tumors typically involve **both ovaries bilaterally** and are characterized by **mucin-producing signet-ring cells** [1]. - Metastasis occurs via **lymphatic or hematogenous spread** [2] or by **direct transperitoneal seeding**. *Liver* - The liver is a common site of metastasis for many GI malignancies, but it is **not the primary origin** of Krukenberg tumors. - **Hepatocellular carcinoma** has a different metastatic pattern and histology (not signet-ring cells). *Ovary* - The ovary is the **site of metastasis**, not the primary origin. - **Primary ovarian malignancies** have different histological features (serous, mucinous, endometrioid) and lack the characteristic signet-ring cell morphology from GI primaries. *Gallbladder* - Gallbladder adenocarcinoma can rarely metastasize to the ovaries, but is an **uncommon source** compared to gastric primaries. - **Gallbladder cancer** typically spreads to liver and regional lymph nodes rather than ovaries. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, p. 779. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Alimentary System Disease, pp. 355-356.

Question 1

In the context of solid tumors, which is the most common site of metastasis?

Accepted Answer

Lung

Answer

Bone

Answer

Liver

Answer

Brain

Question 2

Which of the following best describes a teratoma?

Accepted Answer

A tumor containing tissues from all three germ layers: ectoderm, mesoderm, and endoderm.

Answer

Occurs most commonly in gonadal regions and along the midline.

Answer

Can originate from any of the three germ layers.

Answer

Often asymptomatic, but may cause discomfort depending on size.

Question 3

Which of the following tumors is not associated with an infective etiology?

Accepted Answer

Non-small cell lung carcinoma

Answer

Nasopharyngeal carcinoma

Answer

Hepatocellular carcinoma

Answer

Gastric carcinoma

Question 4

Retinoblastoma is associated with:

Accepted Answer

Osteosarcoma

Answer

Hepatocellular carcinoma

Answer

Squamous cell carcinoma

Answer

Giant cell tumor

Question 5

Which of the following methods is commonly used to study oncogenes?

Accepted Answer

Transformation

Answer

Transduction

Answer

Conjugation

Answer

Gene editing (e.g., CRISPR)

Question 6

Which of the following is NOT classified as a small round cell tumor?

Accepted Answer

Wilm's tumor

Answer

Ewing's sarcoma

Answer

Rhabdomyosarcoma

Answer

Retinoblastoma

Question 7

Which type of cancer is most commonly associated with perineural invasion in the head and neck region?

Accepted Answer

Adenoid cystic carcinoma

Answer

Adenocarcinoma

Answer

Basal cell adenoma

Answer

Squamous cell carcinoma

Question 8

The following gene mutation protects tumor cells from apoptosis:

Accepted Answer

Bcl-2

Answer

BRCA

Answer

RB

Answer

TGFβ

Question 9

Which tumor marker is associated with both colon carcinoma and pancreatic carcinoma?

Accepted Answer

CA-19-9

Answer

CA-125

Answer

CA-15-3

Answer

None of the options

Question 10

Krukenberg tumors originate from:

Accepted Answer

Stomach

Answer

Liver

Answer

Ovary

Answer

Gallbladder

Neoplasia — MCQs

Neoplasia — MCQs

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