Surgical Oncology Principles Practice Questions

Q: Which of the following statements about soft tissue sarcoma is true?

TNM staging is performed for soft tissue sarcomas.. ### Explanation **1. Why Option D is Correct:** Soft tissue sarcomas (STS) are staged using the **AJCC/UICC TNM system**. Unlike many other cancers, the staging of STS is unique because it heavily incorporates **Histological Grade (G)** alongside Tumor size (T), Node involvement (N), and Metastasis (M). Grade is the most important prognostic factor for STS. **2. Why the Other Options are Incorrect:** * **Option A:** Liposarcoma is actually one of the **most common** soft tissue sarcomas in adults (along with Undifferentiated Pleomorphic Sarcoma). It is frequently found in the retroperitoneum and extremities. * **Option B:** For lesions **greater than 5 cm**, the gold standard is a **Core Needle Biopsy (CNB)**, not an incisional biopsy. Incisional biopsy is reserved for cases where CNB is non-diagnostic. If performed, the incision must be longitudinal and placed such that the entire scar can be excised during definitive surgery. * **Option C:** FNAC is generally **not diagnostic** for STS. While it can confirm malignancy or recurrence, it cannot provide adequate tissue architecture to determine the specific histological subtype or grade, which is essential for treatment planning. **3. High-Yield Clinical Pearls for NEET-PG:** * **Most common site:** Lower extremity (specifically the thigh). * **Mode of spread:** Primarily **hematogenous** (most common site of metastasis is the **Lung**). * **Lymphatic spread:** Rare, but seen in "SCARE" (Synovial, Clear cell, Angiosarcoma, Rhabdomyosarcoma, Epithelioid sarcoma). * **Pseudocapsule:** Sarcomas are surrounded by a zone of compressed neoplastic and inflammatory cells; simple "shelling out" leads to high recurrence. * **Treatment:** Wide local excision with radiotherapy is the standard for most high-grade or large tumors.

Q: Which of the following represents a curative resection?

R0. ### Explanation The classification of surgical resection margins is based on the **Residual Tumor (R) Classification** system, which describes the status of the tumor remaining after a surgical procedure. **1. Why R0 is the Correct Answer:** An **R0 resection** indicates a **complete macroscopic and microscopic removal** of the tumor. There are no tumor cells at the resection margins when examined by a pathologist (negative margins). In surgical oncology, R0 is the gold standard and the only category that represents a **curative resection**, as it implies that all local disease has been eradicated. **2. Why the Other Options are Incorrect:** * **R1 Resection:** This refers to **microscopic residual tumor**. While the surgeon may believe they removed the entire mass (macroscopically clear), the pathologist finds tumor cells at the margin under the microscope. This is considered an incomplete resection. * **R2 Resection:** This refers to **macroscopic residual tumor**. The surgeon is aware that visible tumor was left behind (e.g., tumor debulking or involvement of unresectable vital structures). This is a palliative, not curative, procedure. * **R3:** This is not a standard part of the AJCC/UICC R-classification system. The scale traditionally ends at R2. **Clinical Pearls for NEET-PG:** * **The 1 cm Rule:** Traditionally, a 1 cm clear margin was sought for many solid tumors (like colorectal cancer), though modern "negative margin" definitions vary by organ (e.g., "no ink on tumor" for breast conservation). * **CRM (Circumferential Resection Margin):** Crucial in rectal cancer; a CRM of <1 mm is considered an R1 resection and predicts high local recurrence. * **Palliative Surgery:** R2 resections are often performed to relieve symptoms like obstruction or bleeding, even when cure is impossible.

Q: Which of the following is NOT a surrogate marker for assessing a patient's physical reserve to plan oncological treatment?

MSKCC neutropenia risk score. **Explanation:** In oncological surgery and chemotherapy planning, assessing a patient’s **physical reserve** (Performance Status) is critical to determine if they can tolerate aggressive treatment. **Why MSKCC Neutropenia Risk Score is the correct answer:** The MSKCC (Memorial Sloan Kettering Cancer Center) neutropenia risk score is a **predictive tool** used specifically to estimate the likelihood of a patient developing febrile neutropenia following chemotherapy. It focuses on hematological toxicity rather than the patient's overall functional capacity or baseline physical reserve. Therefore, it is not a surrogate marker for general performance status. **Analysis of Incorrect Options:** * **Karnofsky Performance Status (KPS):** A classic scale ranging from 0 to 100. It measures a patient's ability to perform daily activities and need for medical assistance. A higher score indicates better physical reserve. * **ECOG Performance Score:** Developed by the Eastern Cooperative Oncology Group, this scales from 0 (fully active) to 5 (dead). It is the most widely used tool in clinical trials to decide if a patient is fit for surgery or chemotherapy. * **Child-Pugh Score:** While primarily used for cirrhosis, in the context of **Hepatocellular Carcinoma (HCC)**, it is a vital surrogate marker for hepatic physical reserve. It dictates whether a patient can undergo major liver resection (usually reserved for Child-Pugh Class A). **High-Yield Clinical Pearls for NEET-PG:** * **ECOG 0-1:** Generally fit for aggressive surgery/chemotherapy. * **ECOG ≥3:** Usually candidates for palliative care rather than curative surgical resection. * **KPS <70%:** Indicates the patient is unable to care for themselves; prognosis is generally poor. * **Child-Pugh Components:** Remember the mnemonic **ABCDE** (Albumin, Bilirubin, Coagulation/INR, Distension/Ascites, Encephalopathy).

Q: Sentinel lymph node biopsy is indicated in all of the following conditions except?

Carcinoma of the colon. **Explanation:** The concept of **Sentinel Lymph Node Biopsy (SLNB)** is based on the principle that lymphatic drainage from a primary tumor follows a predictable orderly pattern to a specific "first" node (the sentinel node). If this node is negative for metastasis, the remaining nodes in that basin are likely negative, sparing the patient from the morbidity of a radical lymph node dissection. **Why Carcinoma of the Colon is the Correct Answer:** In colon cancer, the lymphatic drainage is often unpredictable and "skip metastasis" can occur. More importantly, the standard surgical treatment for colon cancer is a **formal colectomy**, which inherently includes the wide excision of the associated mesentery and its regional lymph nodes (to ensure adequate oncological margins and staging). Therefore, identifying a single sentinel node does not change the extent of the surgery, making SLNB clinically redundant. **Why the other options are incorrect:** * **Carcinoma of the Breast:** SLNB is the standard of care for clinically node-negative (cN0) patients to avoid the complications of Axillary Lymph Node Dissection (ALND) like lymphedema. * **Malignant Melanoma:** SLNB is indicated for tumors with a thickness >0.75 mm or those with high-risk features to determine the need for therapeutic lymphadenectomy. * **Carcinoma of the Penis:** SLNB (or Dynamic Sentinel Node Biopsy) is indicated in patients with non-palpable inguinal nodes (cN0) but high-risk primary tumors (T1G2 or higher). **High-Yield Clinical Pearls for NEET-PG:** * **Tracer used:** Technetium-99m labeled sulfur colloid and/or isosulfan/methylene blue dye. * **Most common site for SLNB:** Breast cancer and Melanoma. * **Other indications:** Early-stage vulvar cancer and certain oral cavity cancers. * **Contraindication in Breast Cancer:** Inflammatory breast cancer and clinically positive (palpable) axillary nodes.

Q: A Poly A base sequence would most likely be found at which location?

3' end of a eukaryotic mRNA. **Explanation:** The correct answer is **D. 3' end of a eukaryotic mRNA.** In eukaryotic cells, the maturation of pre-mRNA into functional messenger RNA (mRNA) involves a post-transcriptional modification known as **polyadenylation**. This process involves the addition of a "tail" consisting of 50 to 250 adenine nucleotides (the **Poly-A tail**) specifically to the **3' end** of the RNA molecule. **Why it is correct:** The Poly-A tail serves three critical functions: 1. **Stability:** It protects the mRNA from enzymatic degradation by exonucleases. 2. **Nuclear Export:** It facilitates the transport of the mRNA from the nucleus to the cytoplasm. 3. **Translation:** It enhances the recognition of the mRNA by ribosomes for protein synthesis. **Analysis of Incorrect Options:** * **A & B (Prokaryotic mRNA):** Prokaryotic mRNAs generally do not undergo polyadenylation. When polyadenylation does occur in bacteria, it ironically acts as a signal for *degradation* rather than stability. * **C (5' end of eukaryotic mRNA):** The 5' end of eukaryotic mRNA undergoes a different modification called **"Capping"** (addition of a 7-methylguanosine cap), which is essential for ribosome binding and protection from 5' exonucleases. **High-Yield Clinical Pearls for NEET-PG:** * **Sequence Signal:** The polyadenylation signal sequence is typically **AAUAAA**, located upstream of the poly-A site. * **Enzyme:** The addition of the tail is catalyzed by the enzyme **Poly(A) Polymerase**, which does *not* require a DNA template. * **Surgical Oncology Link:** Dysregulation of mRNA stability and polyadenylation patterns is often implicated in the overexpression of oncogenes and the progression of various solid tumors, making it a target for emerging molecular therapies.

Q: Which of the following cancers are correctly matched with the criteria for the minimum number of lymph nodes required for pathological staging? A. CA stomach -10 B. CA colon -12 C. CA gall bladder -6 D. CA breast -15

B,C. ***B,C (Correct Answer)*** - **Colorectal cancer (B)** requires a minimum of **12 lymph nodes** for adequate pathological staging - **correctly matched** ✅ - **Gallbladder cancer (C)** requires at least **6 lymph nodes** for proper staging - **correctly matched** ✅ - These are the only two correctly matched pairs in the question - Adequate lymph node retrieval is essential to prevent **understaging** and ensure accurate prognostic assessment *A,B,C (Incorrect)* - While B and C are correct, **gastric cancer (A)** requires a minimum of **15 lymph nodes**, not 10 - The inclusion of A makes this combination incorrect *A,B,C,D (Incorrect)* - **Gastric cancer (A)** requires **15 lymph nodes**, not 10 - **incorrectly matched** - **Breast cancer (D)** requires a minimum of **10 lymph nodes**, not 15 - **incorrectly matched** - Only B and C are correctly matched *A,C,D (Incorrect)* - **Gastric cancer (A)** requires **15 lymph nodes**, not 10 - **incorrectly matched** - **Breast cancer (D)** requires **10 lymph nodes**, not 15 - **incorrectly matched** - C is correct, but A and D are both incorrectly matched

Question 1

In which of the following conditions is neo-adjuvant chemotherapy NOT used?

Accepted Answer

Breast cancer stage 2

Answer

Osteosarcoma

Answer

PNET of the chest wall

Answer

Ovarian cancer stage 3

Question 2

Which of the following statements about soft tissue sarcoma is true?

Accepted Answer

TNM staging is performed for soft tissue sarcomas.

Answer

Liposarcoma is rare.

Answer

Incisional biopsy is indicated for lesions greater than 5 cm.

Answer

Fine needle aspiration cytology (FNAC) is diagnostic.

Question 3

Which of the following represents a curative resection?

Accepted Answer

R0

Answer

R1

Answer

R2

Answer

R3

Question 4

Adjuvant chemotherapy is of definite value in which of the following conditions?

Accepted Answer

Colon cancer

Answer

Pancreatic cancer

Answer

Gall bladder cancer

Answer

Esophageal cancer

Question 5

Which of the following is NOT a surrogate marker for assessing a patient's physical reserve to plan oncological treatment?

Accepted Answer

MSKCC neutropenia risk score

Answer

Karnofsky performance status

Answer

ECOG performance score

Answer

Child-Pugh score

Question 6

Sentinel lymph node biopsy is indicated in all of the following conditions except?

Accepted Answer

Carcinoma of the colon

Answer

Carcinoma of the breast

Answer

Carcinoma of the penis

Answer

Malignant melanoma

Question 7

What is the treatment of choice for desmoid tumors?

Accepted Answer

Surgery + Radiotherapy

Answer

Surgery

Answer

Chemotherapy

Answer

Radiotherapy

Question 8

A Poly A base sequence would most likely be found at which location?

Accepted Answer

3' end of a eukaryotic mRNA

Answer

5' end of a prokaryotic messenger RNA (mRNA)

Answer

3' end of a prokaryotic mRNA

Answer

5' end of a eukaryotic mRNA

Question 9

A 50-year-old alcoholic patient presents with a history of waxing and waning jaundice for the past 2 months. His CT examination reveals dilatation of the common bile duct and pancreatic duct. What is the most probable diagnosis in the patient?

Accepted Answer

Periampullary carcinoma

Answer

Common bile duct stone

Answer

Head of the pancreas carcinoma

Answer

Cholangiocarcinoma

Question 10

Which of the following cancers are correctly matched with the criteria for the minimum number of lymph nodes required for pathological staging?
A. CA stomach -10
B. CA colon -12
C. CA gall bladder -6
D. CA breast -15

Accepted Answer

B,C

Answer

A,B,C

Answer

A,B,C,D

Answer

A,C,D

Surgical Oncology Principles — MCQs

Surgical Oncology Principles — MCQs

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