Adjuvant Therapies Indian Medical PG Practice Questions and MCQs
Practice Indian Medical PG questions for Adjuvant Therapies. These multiple choice questions (MCQs) cover important concepts and help you prepare for your exams.
Adjuvant Therapies Indian Medical PG Question 1: Which statement is incorrect about the pathology of the bone tumor?
- A. Tumor has distinct margin
- B. Tumor arises from epiphyseal to metaphyseal region
- C. Eccentric lesion
- D. Chemotherapy is the treatment of choice for all bone tumors. (Correct Answer)
Adjuvant Therapies Explanation: ***Tumor has distinct margin***
- A **distinct margin** often indicates a benign tumor, while malignant tumors typically show **infiltrative margins**.
- In bone tumors, particularly malignant ones, the lack of clear demarcation is a key pathological feature.
*Chemotherapy is the treatment of choice*
- While chemotherapy may be used for certain **malignant bone tumors**, it is not the first-line treatment for most bone tumors [1].
- The primary treatment is often **surgical excision**, especially for localized lesions [1].
*Tumor arise from epiphyseal to metaphyseal region*
- While some tumors can originate in these areas, many actually arise from the **diaphyseal** region in bone tumors like osteosarcoma.
- This option misrepresents the common locations where various tumors develop, as osteochondromas tend to develop near the epiphyses of limb bones [2].
*Eccentric lesion*
- Many bone tumors do indeed present as **eccentric lesions**, especially benign ones like **osteochondromas**.
- However, this feature does not apply universally, as some malignant tumors can also be **central or infiltrative** in nature.
**References:**
[1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Osteoarticular And Connective Tissue Disease, pp. 673-674.
[2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Osteoarticular And Connective Tissue Disease, pp. 672-673.
Adjuvant Therapies Indian Medical PG Question 2: Classification system of bone tumors is -
- A. Enneking (Correct Answer)
- B. Edmonton
- C. TNM
- D. Manchester
Adjuvant Therapies Explanation: ***Enneking***
- The **Enneking staging system** is widely used for primary **bone tumors**, particularly sarcomas.
- It classifies tumors based on their histological grade, local extension, and presence of metastases, which guides surgical planning and prognosis.
*Edmonton*
- The **Edmonton classification** is primarily used for **periprosthetic fractures** around hip and knee replacements.
- It does not classify primary bone tumors but rather describes fracture patterns related to prosthetic implants.
*TNM*
- The **TNM (Tumor, Node, Metastasis)** classification is a general staging system used for many types of cancer, but it's not the primary system for bone tumors.
- While applicable for some bone cancers, the **Enneking system** provides a more specific functional and anatomical assessment for limb-sparing surgery in bone sarcomas.
*Manchester*
- The **Manchester staging system** is primarily used for **lymphoma**, particularly Hodgkin lymphoma.
- It describes the extent of lymph node involvement and extralymphatic disease, completely unrelated to bone tumors.
Adjuvant Therapies Indian Medical PG Question 3: A patient with GCT, which of the following is false?
- A. Defined margins
- B. Chemotherapy is the mainstay of treatment (Correct Answer)
- C. Epiphyseo-metaphyseal location
- D. Eccentric
Adjuvant Therapies Explanation: ***Chemotherapy is the mainstay of treatment***
- This statement is **false** because **Giant Cell Tumor of Bone (GCT)** therapy primarily involves **surgical resection**, with or without adjuvant therapies like **denosumab**.
- **Chemotherapy** is generally *not* the first-line treatment for GCT, as these tumors respond poorly to it; it's usually reserved for cases of **metastatic GCT** or when other treatments fail.
*Defined margins*
- GCTs often present radiographically with **well-defined, non-sclerotic margins**, which indicates a lytic lesion that is often locally aggressive but typically doesn't invade widely.
- While they are locally destructive, their borders are usually visible, helping distinguish them from other bone tumors.
*Epiphyseo-metaphyseal location*
- GCTs commonly originate in the **metaphysis** of long bones and **extend into the epiphysis** after the growth plate has closed.
- This characteristic location near a joint is a classic diagnostic feature of GCT, especially in adults.
*Eccentric*
- GCTs typically arise **eccentrically** within the bone, meaning they originate off-center in the bone marrow cavity before expanding and thinning the cortex.
- This eccentric growth pattern is a distinguishing feature, particularly in contrast to other bone tumors which might be centrally located.
Adjuvant Therapies Indian Medical PG Question 4: Most radiosensitive tumor among the following is
- A. Dysgerminoma (Correct Answer)
- B. Osteogenic sarcoma
- C. Parotid carcinoma
- D. Bronchogenic carcinoma
Adjuvant Therapies Explanation: ***Dysgerminoma***
- **Dysgerminomas** are highly **radiosensitive** tumors, meaning they respond very well to radiation therapy.
- This characteristic is often exploited in their treatment, especially for widespread disease or as adjuvant therapy.
*Osteogenic sarcoma*
- **Osteogenic sarcomas** (osteosarcomas) are generally **radioresistant**, requiring high doses of radiation for local control, often with limited success.
- Treatment primarily relies on **surgery** and **chemotherapy**.
*Parotid carcinoma*
- **Parotid carcinomas** exhibit variable radiosensitivity depending on their histology, but generally are not considered among the most radiosensitive tumors.
- Postoperative **radiotherapy** is often used for high-risk features rather than as primary monotherapy.
*Bronchogenic carcinoma*
- **Bronchogenic carcinomas** (lung cancers) show variable radiosensitivity. **Small cell lung carcinoma** is more radiosensitive than **non-small cell lung carcinoma**, but neither is considered as radiosensitive as dysgerminoma.
- Treatment often involves **multimodality therapy** including chemotherapy, surgery, and radiation, with radiation efficacy depending on tumor type and stage.
Adjuvant Therapies Indian Medical PG Question 5: Which of the following tumours is radiosensitive?
- A. Ewing's sarcoma (Correct Answer)
- B. Osteosarcoma
- C. Hepatocellular carcinoma
- D. Malignant melanoma
Adjuvant Therapies Explanation: ***Ewing's sarcoma***
- **Ewing's sarcoma** is highly radiosensitive, meaning radiation therapy is an effective treatment modality, often used as a primary or adjuvant therapy.
- Its high responsiveness to radiation helps control local disease and improve patient outcomes, especially when combined with chemotherapy.
*Osteosarcoma*
- **Osteosarcoma** is generally considered radioresistant, meaning it responds poorly to radiation therapy.
- While radiation may be used in specific palliative settings, it is not a primary curative treatment for osteosarcoma, which primarily relies on surgery and chemotherapy.
*Hepatocellular carcinoma*
- **Hepatocellular carcinoma (HCC)** is largely radioresistant, and external beam radiation therapy has limited efficacy as a stand-alone treatment.
- While certain advanced techniques like stereotactic body radiation therapy (SBRT) can be used for localized control, it is not considered broadly radiosensitive.
*Malignant melanoma*
- **Malignant melanoma** is historically considered highly radioresistant, requiring very high doses of radiation for any significant tumor control.
- In recent years, high-dose, hypofractionated radiation therapy has shown some promise for local control, but it is not a universally radiosensitive tumor.
Adjuvant Therapies Indian Medical PG Question 6: What is the most appropriate treatment for a soap bubble appearance at the lower end of the radius?
- A. Local excision
- B. Excision and bone grafting (Correct Answer)
- C. Amputation
- D. Radiotherapy
Adjuvant Therapies Explanation: ***Excision and bone grafting***
- A **soap bubble appearance** at the lower end of the radius is highly suggestive of a **giant cell tumor (GCT)**, which is locally aggressive and has a high recurrence rate after simple curettage.
- **Excision of the tumor and filling the defect with bone graft** is the preferred treatment to reduce recurrence and maintain skeletal integrity.
*Local excision*
- While local excision might remove the visible tumor, **GCTs are known to recur frequently** (up to 50%) after intralesional treatments like simple curettage.
- It does not adequately address microscopic extensions or the risk of **local aggressive behavior**.
*Amputation*
- **Amputation is an overly aggressive and unnecessary treatment** for a GCT, as it is a benign but locally aggressive tumor.
- It would be considered only in rare cases of extensive soft tissue invasion or intractable recurrence, which is not implied by a "soap bubble appearance."
*Radiotherapy*
- **Radiotherapy is generally not the first-line treatment for GCTs** due to concerns about **malignant transformation** (osteosarcoma) in a small percentage of cases, especially with high doses.
- It may be considered for unresectable tumors or recurrent lesions in difficult anatomical locations, or as an adjuvant.
Adjuvant Therapies Indian Medical PG Question 7: In the treatment of osteosarcoma, all of the following chemotherapy agents are used EXCEPT:
- A. High dose methotrexate
- B. Cyclophosphamide
- C. Vincristine (Correct Answer)
- D. Doxorubicin
Adjuvant Therapies Explanation: **Explanation:**
The standard of care for **Osteosarcoma** involves a multimodal approach consisting of neoadjuvant chemotherapy, wide local surgical excision (limb-salvage surgery), and adjuvant chemotherapy.
**Why Vincristine is the correct answer:**
Vincristine is a vinca alkaloid that inhibits microtubule formation. While it is a cornerstone in the treatment of **Ewing’s Sarcoma** (as part of the VAC/VAI regimen), it has no proven efficacy against Osteosarcoma. Therefore, it is not included in standard osteosarcoma protocols.
**Analysis of other options:**
* **High-dose Methotrexate (with Leucovorin rescue):** This is a primary agent used to inhibit dihydrofolate reductase, crucial for treating high-grade osteosarcoma.
* **Doxorubicin (Adriamycin):** An anthracycline that remains one of the most effective drugs for bone sarcomas.
* **Cyclophosphamide:** While not part of the primary "MAP" (Methotrexate, Adriamycin, Platinum) regimen, it is frequently used in **second-line or salvage therapy** for recurrent or refractory osteosarcoma.
**High-Yield NEET-PG Pearls:**
1. **Standard Regimen (MAP):** The most common chemotherapy combination for Osteosarcoma is **M**ethotrexate, **A**driamycin (Doxorubicin), and **P**latin (Cisplatin).
2. **Ewing’s Sarcoma Regimen:** Remember the mnemonic **VAC** (Vincristine, Adriamycin, Cyclophosphamide) or **VAI** (Ifosfamide instead of Cyclophosphamide).
3. **Prognostic Marker:** The most important prognostic factor in osteosarcoma is the **histologic response to neoadjuvant chemotherapy** (Huvos grade; >90% necrosis indicates a good prognosis).
4. **Radio-resistance:** Osteosarcoma is generally radio-resistant, making chemotherapy and surgery the mainstays of treatment.
Adjuvant Therapies Indian Medical PG Question 8: Which of the following statements is true regarding hemangioma of the bone?
- A. Occurs commonly in skull bones.
- B. Requires observation as it is premalignant.
- C. Hamartomatous in origin. (Correct Answer)
- D. Forms 10-12% of bone tumors.
Adjuvant Therapies Explanation: **Explanation:**
**Hemangioma of the bone** is a benign, slow-growing vascular lesion. The correct answer is **C** because these lesions are considered **hamartomatous** in origin—meaning they are a malformation of normal vascular tissue (capillary, cavernous, or venous) rather than a true neoplastic growth.
**Analysis of Options:**
* **Option A (Incorrect):** While hemangiomas can occur in the skull, the **vertebral column** (specifically the thoracic and lumbar spine) is the most common site, followed by the skull.
* **Option B (Incorrect):** Hemangiomas are strictly **benign** and have no documented malignant potential. Most are asymptomatic and require observation only because they are harmless, not because they are premalignant.
* **Option D (Incorrect):** They are relatively common incidental findings (found in ~10% of autopsies), but they account for only **0.7% to 1%** of all primary bone tumors, not 10-12%.
**High-Yield Clinical Pearls for NEET-PG:**
* **Radiological Signs:**
* **Vertebra:** Shows a characteristic **"Jail-bar"** or **"Corduroy cloth"** appearance due to the thickening of vertical trabeculae.
* **Skull:** Shows a classic **"Sunburst"** or **"Spoke-wheel"** pattern of trabeculation.
* **Management:** Most are asymptomatic and require no treatment. If symptomatic (e.g., spinal cord compression), options include radiotherapy, embolization, or surgical decompression.
* **Polka-dot Sign:** On CT scans of the vertebrae, the cross-section of thickened vertical trabeculae appears as multiple small dots.
Adjuvant Therapies Indian Medical PG Question 9: Osteosarcoma commonly affects which part of a long bone?
- A. Metaphysis (Correct Answer)
- B. Diaphysis
- C. Epiphysis
- D. None of the above
Adjuvant Therapies Explanation: **Explanation:**
**1. Why Metaphysis is Correct:**
Osteosarcoma is a primary malignant bone tumor characterized by the production of osteoid (immature bone) by malignant cells. It most commonly occurs in the **metaphysis** of long bones (especially the distal femur, proximal tibia, and proximal humerus). The underlying medical reason is that the metaphysis is the site of **maximum metabolic activity and rapid cell turnover** during the adolescent growth spurt. Since Osteosarcoma is a tumor of primitive mesenchymal cells, it predilects areas where bone remodeling and growth are most intense.
**2. Why Other Options are Incorrect:**
* **Diaphysis (B):** This is the shaft of the bone. While less common for Osteosarcoma, the diaphysis is the classic site for **Ewing’s Sarcoma**, Adamantinoma, and Osteoid Osteoma.
* **Epiphysis (C):** This is the end of the bone. Tumors in this location are rare. The two "classic" epiphyseal tumors are **Giant Cell Tumor (GCT)** (after physeal closure) and **Chondroblastoma** (before physeal closure).
**3. Clinical Pearls for NEET-PG:**
* **Age Group:** Most common in the 2nd decade of life (10–20 years).
* **Radiological Signs:** Look for the **"Sunray appearance"** or **"Sunburst appearance"** (due to spiculated periosteal reaction) and **Codman’s Triangle** (due to the elevation of the periosteum).
* **Laboratory:** Serum **Alkaline Phosphatase (ALP)** is often elevated and serves as a marker for prognosis and treatment response.
* **Genetics:** Strongly associated with mutations in the **Rb gene** (Retinoblastoma) and **TP53 gene** (Li-Fraumeni syndrome).
* **Spread:** Hematogenous spread to the **lungs** is the most common site of metastasis.
Adjuvant Therapies Indian Medical PG Question 10: A 50-year-old lady presented with a 3-month history of pain in the lower third of the right thigh. There was no local swelling; tenderness was present on deep pressure. Plain X-rays showed an ill-defined intra medullary lesion with blotchy calcification at the lower end of the right femoral diaphysis, possibly enchondroma or chondrosarcoma. Sections showed a cartilaginous tumor. Which of the following histological features would be most helpful to differentiate these two tumors?
- A. Focal necrosis and lobulation
- B. Tumor permeation between bone trabeculae at the periphery (Correct Answer)
- C. Extensive myxoid change
- D. High cellularity
Adjuvant Therapies Explanation: ### Explanation
The differentiation between a low-grade **Chondrosarcoma** and an **Enchondroma** is one of the most challenging tasks in orthopedic pathology, as they often share similar cytological features.
#### 1. Why Option B is Correct
The most reliable histological hallmark of malignancy in cartilaginous tumors is **host bone entrapment (permeation)**.
* **Enchondromas** are well-circumscribed and grow by expansion, often showing a "scalloped" internal border but staying confined within their lobules.
* **Chondrosarcomas** exhibit an aggressive growth pattern where the tumor matrix infiltrates and surrounds pre-existing lamellar bone trabeculae. This "filling up" of the marrow spaces and entrapment of host bone is a definitive sign of malignancy, even in the absence of high-grade cytologic features.
#### 2. Why Other Options are Incorrect
* **Option A (Focal necrosis and lobulation):** While necrosis is more common in malignancy, focal necrosis can occasionally occur in benign lesions due to vascular compromise. Lobulation is a characteristic of almost all hyaline cartilage tumors, both benign and malignant.
* **Option C (Extensive myxoid change):** Myxoid degeneration can be seen in both tumors. While prominent in high-grade chondrosarcomas, it is not as specific a differentiator as permeation for low-grade lesions.
* **Option D (High cellularity):** Cellularity is subjective. Many enchondromas (especially in the small bones of hands/feet) can be hypercellular without being malignant.
#### 3. NEET-PG High-Yield Pearls
* **Location Rule:** A cartilaginous tumor in the small bones of the hand/feet is almost always an **Enchondroma**. In the axial skeleton (pelvis, femur, scapula), it is more likely a **Chondrosarcoma**.
* **Radiological Sign:** "Endosteal scalloping" involving more than 2/3rds of the cortical thickness suggests Chondrosarcoma.
* **Clinical Clue:** Pain in the absence of a fracture is a strong indicator of malignancy in a cartilaginous lesion.
* **Histology:** Look for **binucleated cells**; while they suggest Chondrosarcoma, permeation remains the "gold standard" for diagnosis.
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