Adjuvant Therapies — MCQs
Which statement is incorrect about the pathology of the bone tumor?
Classification system of bone tumors is -
A patient with GCT, which of the following is false?
Most radiosensitive tumor among the following is
Which of the following tumours is radiosensitive?
What is the most appropriate treatment for a soap bubble appearance at the lower end of the radius?
In the treatment of osteosarcoma, all of the following chemotherapy agents are used EXCEPT:
Which of the following statements is true regarding hemangioma of the bone?
What is the most common bone involved in hemangioma?
Which of the following is NOT an epiphyseal tumor?
Adjuvant Therapies Indian Medical PG Practice Questions and MCQs
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)
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.
Question 2: Classification system of bone tumors is -
- A. Enneking (Correct Answer)
- B. Edmonton
- C. TNM
- D. Manchester
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.
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
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.
Question 4: Most radiosensitive tumor among the following is
- A. Dysgerminoma (Correct Answer)
- B. Osteogenic sarcoma
- C. Parotid carcinoma
- D. Bronchogenic carcinoma
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.
Question 5: Which of the following tumours is radiosensitive?
- A. Ewing's sarcoma (Correct Answer)
- B. Osteosarcoma
- C. Hepatocellular carcinoma
- D. Malignant melanoma
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.
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
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.
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
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.
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.
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.
Question 9: What is the most common bone involved in hemangioma?
- A. Femur
- B. Tibia
- C. Pelvis
- D. Vertebrae (Correct Answer)
Explanation: **Explanation:** **Hemangioma** is a benign, slow-growing vascular tumor characterized by the proliferation of blood vessels. It is the most common primary benign tumor of the spine. 1. **Why Vertebrae is Correct:** The **vertebral column** (specifically the thoracic and lumbar spine) is the most common site for skeletal hemangiomas. They are usually asymptomatic and discovered incidentally on imaging. Pathologically, they involve the replacement of bone marrow by vascular channels, leading to the characteristic **"Polka-dot" appearance** on axial CT scans and a **"Corduroy cloth" or "Jail-bar" appearance** (vertical striations) on lateral X-rays due to the thickening of remaining vertical trabeculae. 2. **Why Other Options are Incorrect:** * **Femur and Tibia:** While these are common sites for other bone tumors like Osteoid Osteoma or Osteosarcoma, they are rare sites for hemangiomas. When hemangiomas occur in long bones, they are often located in the craniofacial bones (skull) rather than the appendicular skeleton. * **Pelvis:** Although the pelvis contains significant marrow, it is a much less frequent site for hemangiomas compared to the axial skeleton (spine and skull). **High-Yield Clinical Pearls for NEET-PG:** * **Most common site:** Vertebrae (Thoracic > Lumbar). * **Second most common site:** Skull (Calvarium). * **Radiological Signs:** "Jail-bar" appearance (X-ray), "Polka-dot" sign (CT), and high signal intensity on both T1 and T2 weighted images (MRI) due to fat content. * **Management:** Most are asymptomatic and require no treatment. Symptomatic cases (causing cord compression) may require radiotherapy, embolization, or surgery.
Question 10: Which of the following is NOT an epiphyseal tumor?
- A. Chondroblastoma
- B. Osteoclastoma
- C. Clear cell chondrosarcoma
- D. Simple bone cyst (Correct Answer)
Explanation: The location of a bone tumor relative to the growth plate (epiphysis, metaphysis, or diaphysis) is a high-yield diagnostic marker in orthopaedics. ### **Explanation of the Correct Answer** **D. Simple Bone Cyst (SBC):** This is a **metaphyseal** lesion. SBCs (also known as Unicameral Bone Cysts) typically occur in the proximal humerus or femur of children. They originate near the growth plate in the metaphysis and "migrate" toward the diaphysis as the bone grows. They are never primarily epiphyseal. ### **Analysis of Incorrect Options (Epiphyseal Tumors)** The epiphysis is an uncommon site for tumors; therefore, the few that occur there are frequently tested: * **A. Chondroblastoma:** The classic epiphyseal tumor in children/adolescents (before physeal closure). It is often referred to as "Codman’s tumor." * **B. Osteoclastoma (Giant Cell Tumor):** The most common epiphyseal tumor in adults (after physeal closure). It characteristically extends from the metaphysis into the epiphysis up to the subchondral bone. * **C. Clear Cell Chondrosarcoma:** A rare, low-grade malignant variant of chondrosarcoma that specifically involves the epiphysis of long bones (often the femoral head), mimicking a GCT or chondroblastoma. ### **NEET-PG High-Yield Pearls** * **Mnemonic for Epiphyseal Lesions:** "**C**-**G**-**C**" (**C**hondroblastoma, **G**iant Cell Tumor, **C**lear Cell Chondrosarcoma). * **Age Distinction:** If the physis is **open** (child) → Chondroblastoma; if the physis is **closed** (adult) → Giant Cell Tumor. * **SBC Radiographic Sign:** Look for the **"Fallen Leaf Sign"** (a pathological fracture where a cortical fragment settles at the bottom of the fluid-filled cyst). * **Diaphyseal Tumors:** Remember **Ewing’s Sarcoma**, Osteoid Osteoma, and Adamantinoma.
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