Occupational Cancers — MCQs
A 45-year-old male reports several years of asbestos exposure while working in the construction industry. He reports smoking 2 packs of cigarettes per day for over 20 years. Smoking and asbestos exposure increase the incidence of which of the following diseases?
Which of the following is NOT a recognized cause of Urothelial Carcinomas?
Mesothelioma is closely associated with which of the following?
A patient presents with generalized and easy fatigability. He reports weakness while working in a factory with exposure to benzene. Which of the following conditions should be suspected in this patient?
The strongest occupational risk factor for hematological carcinoma is
Nowadays radium is not used in the Rx of cancer because:
Which one of the following is NOT a utilization rate?
Depression of consciousness level in hypothermia starts when the core body temperature falls below which value?
Which of the following is an example of a cold burn?
Which of the following is NOT a mechanism by which lightning causes injury?
Occupational Cancers Indian Medical PG Practice Questions and MCQs
Question 1: A 45-year-old male reports several years of asbestos exposure while working in the construction industry. He reports smoking 2 packs of cigarettes per day for over 20 years. Smoking and asbestos exposure increase the incidence of which of the following diseases?
- A. Emphysema
- B. Malignant pulmonary mesothelioma
- C. Multiple myeloma
- D. Bronchogenic carcinoma (Correct Answer)
- E. Chronic bronchitis
Explanation: ***Bronchogenic carcinoma*** - **Smoking** is the leading cause of **bronchogenic carcinoma**, and **asbestos exposure** significantly *multiplies* its risk, rather than simply adding to it. - This synergistic effect means that smokers exposed to asbestos have a **much higher incidence** of lung cancer compared to those with either exposure alone. *Emphysema* - Primarily linked to **smoking** and chronic exposure to irritants, but asbestos exposure does not significantly increase its incidence. - While both smoking and asbestos can cause pulmonary issues, their primary mechanisms for emphysema are distinct. *Malignant pulmonary mesothelioma* - **Malignant mesothelioma** is strongly associated with **asbestos exposure**, but its incidence is *not significantly increased* by smoking. - Smoking is a risk factor for lung cancer, but not a primary risk factor for mesothelioma itself. *Multiple myeloma* - This is a **hematologic malignancy** (cancer of plasma cells) and has no established link with either **smoking** or **asbestos exposure**. - Its risk factors are largely genetic and related to other environmental factors, but not directly linked to respiratory toxins. *Chronic bronchitis* - **Chronic bronchitis** is primarily caused by **smoking** and exposure to environmental pollutants. - While asbestos exposure can cause lung damage, it doesn't directly or significantly increase the incidence of chronic bronchitis.
Question 2: Which of the following is NOT a recognized cause of Urothelial Carcinomas?
- A. Industrial solvents
- B. Exposure to thorotrast
- C. Alcohol consumption (Correct Answer)
- D. Smoking
Explanation: ***Alcohol consumption*** - Research does not support a direct association between **alcohol consumption** and an increased risk of urothelial carcinomas. - While excessive alcohol can lead to other forms of cancer, it is not a recognized risk factor for **bladder cancer** specifically. *Smoking* - Smoking is a well-established risk factor for **urothelial carcinomas**, significantly increasing the risk of **bladder cancer** [1]. - It is responsible for up to **50% of bladder cancer cases**, due to carcinogens in tobacco smoke [1]. *Exposure to thorotrast* - **Thorotrast**, a radiopaque contrast medium, is associated with **radiation exposure**, which is a known risk for urothelial carcinomas [3]. - Its use has been linked to increased incidence of bladder cancer due to radioactive properties [3]. *Industrial solvents* - Exposure to various **industrial solvents** such as **aromatic amines** has been linked to a higher risk of developing urothelial carcinomas [1][2]. - These chemicals are commonly found in **dyes**, **rubber**, and other manufacturing processes [2]. **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. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. (Basic Pathology) introduces the student to key general principles of pathology, both as a medical science and as a clinical activity with a vital role in patient care. Part 2 (Disease Mechanisms) provides fundamental knowledge about the cellular and molecular processes involved in diseases, providing the rationale for their treatment. Part 3 (Systematic Pathology) deals in detail with specific diseases, with emphasis on the clinically important aspects., pp. 217-218. [3] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. (Basic Pathology) introduces the student to key general principles of pathology, both as a medical science and as a clinical activity with a vital role in patient care. Part 2 (Disease Mechanisms) provides fundamental knowledge about the cellular and molecular processes involved in diseases, providing the rationale for their treatment. Part 3 (Systematic Pathology) deals in detail with specific diseases, with emphasis on the clinically important aspects., pp. 216-217.
Question 3: Mesothelioma is closely associated with which of the following?
- A. Silicosis
- B. Anthracosis
- C. Byssinosis
- D. Asbestosis (Correct Answer)
Explanation: ***Asbestosis*** - Mesothelioma is a rare but aggressive cancer of the **pleura** or **peritoneum**, and its strongest known etiological link is with **asbestos exposure**. - Asbestos fibers can become lodged in the lungs and pleural lining, leading to chronic inflammation, DNA damage, and eventually oncogenic transformation. *Silicosis* - **Silicosis** is a lung disease caused by inhaling **crystalline silica dust**, primarily affecting miners, construction workers, and foundry workers. - While it can lead to pulmonary fibrosis and an increased risk of tuberculosis and lung cancer, it is not directly associated with mesothelioma. *Anthracosis* - **Anthracosis** is often seen in coal miners and urban dwellers due to the inhalation of **carbon dust**, leading to the accumulation of pigment in the lungs. - This condition is generally benign but can contribute to the development of **coal worker's pneumoconiosis**, which is distinct from mesothelioma. *Byssinosis* - **Byssinosis** is an occupational lung disease caused by the inhalation of **cotton dust** or other textile dusts, typically affecting textile workers. - Symptoms include chest tightness and shortness of breath, particularly after beginning work after a break, and it is unrelated to mesothelioma.
Question 4: A patient presents with generalized and easy fatigability. He reports weakness while working in a factory with exposure to benzene. Which of the following conditions should be suspected in this patient?
- A. Hepatocellular Carcinoma
- B. Leukemia (Correct Answer)
- C. Carcinoma Gall Bladder
- D. Urinary Bladder Cancer
- E. Aplastic Anemia
Explanation: ***Leukemia*** - **Benzene exposure** is a well-established risk factor for developing **leukemia**, particularly acute myeloid leukemia (AML) and myelodysplastic syndromes (MDS). - **Generalized fatigue** and **easy fatigability** are common symptoms of leukemia, resulting from anemia, bone marrow infiltration, and systemic effects of the disease. - Benzene is classified as a **Group 1 carcinogen** by IARC with strong evidence for leukemogenesis. *Aplastic Anemia* - While benzene exposure can cause **aplastic anemia** (bone marrow failure), this condition typically presents with **pancytopenia** and more severe symptoms including bleeding and infections. - However, given the occupational exposure and symptoms, **leukemia** remains the primary concern as it is more commonly associated with chronic benzene exposure. - Aplastic anemia from benzene is less common than benzene-induced leukemia. *Hepatocellular Carcinoma* - While benzene exposure can be **hepatotoxic**, it is not primarily associated with an increased risk of **Hepatocellular Carcinoma**. - Risk factors for hepatocellular carcinoma include **chronic viral hepatitis** (HBV, HCV) and **alcoholism**. *Carcinoma Gall Bladder* - There is **no significant association** between benzene exposure and the development of **gallbladder cancer**. - Risk factors for gallbladder cancer include **gallstones**, porcelain gallbladder, and chronic inflammation. *Urinary Bladder Cancer* - **Aromatic amines** and **anilines** (often found in dye, rubber, and chemical industries) are established causes of bladder cancer, not typically benzene itself. - While benzene is a carcinogen, **bladder cancer** is not considered a primary or strong association with its exposure.
Question 5: The strongest occupational risk factor for hematological carcinoma is
- A. Benzene (Correct Answer)
- B. Lithium
- C. Radiation exposure
- D. Cigarette smoke
Explanation: ***Benzene*** - Benzene exposure is recognized as a potent **carcinogen** linked to various hematological malignancies, including **leukemia** [1]. - It affects the **bone marrow**, leading to dysplastic changes and ultimately malignancy. *Nicotine* - Although nicotine is associated with **smoking-related cancers**, it is not directly linked to **hematological carcinomas**. - Its primary role is in causing **lung cancer**, rather than blood cancers. *Lithium* - Lithium is primarily used for **bipolar disorder** and does not have a known link to causing hematological malignancies. - Side effects are more related to **nephrotoxicity** rather than carcinogenic effects. *Alcohol* - Alcohol consumption is primarily associated with **liver cancers** and not specifically linked to hematological carcinomas [2]. - It can contribute to general malignancy development but is not a direct cause of blood cancers. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, p. 286. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. (Basic Pathology) introduces the student to key general principles of pathology, both as a medical science and as a clinical activity with a vital role in patient care. Part 2 (Disease Mechanisms) provides fundamental knowledge about the cellular and molecular processes involved in diseases, providing the rationale for their treatment. Part 3 (Systematic Pathology) deals in detail with specific diseases, with emphasis on the clinically important aspects., pp. 217-218.
Question 6: Nowadays radium is not used in the Rx of cancer because:
- A. It is a very unstable element
- B. It decays into daughter Radon which is a constant hazard (Correct Answer)
- C. It decays faster and needs frequent replacement
- D. It has a very long half life
Explanation: ***It decays into daughter Radon which is a constant hazard*** - Radium-226 decays into **Radon-222**, a radioactive gas that can leak from sealed sources or medical devices. - This **gaseous daughter product** poses a significant radiation hazard to patients and medical staff, necessitating extensive safety precautions. *It is a very unstable element* - While radium is a **radioactive element** and thus unstable, its inherent instability alone isn't the primary reason for its disuse in cancer therapy. - The specific hazard comes from **what it decays into**, not just the act of decay itself. *It decays faster and needs frequent replacement* - Radium-226 has a **half-life of 1600 years**, meaning it decays very slowly and would not require frequent replacement. - This long half-life is actually a characteristic that makes its daughter product, Radon-222, a persistent issue rather than a rapid decay being the problem. *It has a very long half life* - A long half-life (e.g., 1600 years for Radium-226) means the radioactive material persists for a very long time, leading to a **prolonged source of radiation**. - While this is true, the primary concern in its historical therapeutic use was the **radioactive gaseous daughter product**, Radon, which accumulates and poses an ongoing hazard.
Question 7: Which one of the following is NOT a utilization rate?
- A. Population bed ratio (Correct Answer)
- B. Bed occupancy rate
- C. Bed turnover ratio
- D. Average length of stay
Explanation: ***Population bed ratio*** - The **population bed ratio** indicates the number of available beds per unit of population, reflecting healthcare **resource availability** rather than resource utilization. - It is a measure of healthcare capacity and access, not how intensively those beds are being used. *Bed occupancy rate* - The **bed occupancy rate** measures the proportion of available hospital beds that are occupied over a given period, directly indicating the **utilization** of bed resources. - A higher rate suggests more efficient use of beds, while a lower rate may indicate underutilization or excess capacity. *Bed turnover ratio* - The **bed turnover ratio** calculates the number of patients discharged per bed over a specific period, reflecting how frequently beds are being used and re-used. - It indicates the **efficiency** with which beds are being utilized and cleared for new patients. *Average length of stay* - The **average length of stay (ALOS)** represents the average number of days a patient remains hospitalized, which directly relates to the **duration of bed utilization** per patient. - A shorter ALOS can indicate more efficient use of beds, while a longer ALOS may suggest higher resource consumption per patient.
Question 8: Depression of consciousness level in hypothermia starts when the core body temperature falls below which value?
- A. 35°C
- B. 34°C
- C. 33°C
- D. 32°C (Correct Answer)
Explanation: **Explanation:** Hypothermia is defined as a core body temperature below **35°C (95°F)**. It is clinically categorized into mild, moderate, and severe stages based on the physiological response of the body. **Why 32°C is the Correct Answer:** The transition from mild to **moderate hypothermia** occurs at **32°C (89.6°F)**. This is a critical physiological threshold where the body’s compensatory mechanisms (like shivering) begin to fail. At this temperature, cerebral metabolism slows significantly, leading to a progressive **depression of the consciousness level**, characterized by stupor, confusion, and eventual coma. **Analysis of Incorrect Options:** * **35°C (Option A):** This is the threshold for **Mild Hypothermia**. At this stage, the patient is fully conscious but may exhibit shivering, tachycardia, and tachypnea as the body attempts to generate heat. * **34°C & 33°C (Options B & C):** These temperatures fall within the range of mild hypothermia. While the patient may experience dysarthria (slurred speech) or ataxia, the global depression of consciousness typically does not manifest until the temperature drops below the 32°C mark. **High-Yield Clinical Pearls for NEET-PG:** 1. **Paradoxical Undressing:** Seen in severe hypothermia; the victim feels hot due to sudden vasodilation and removes clothes before death. 2. **Hide-and-Die Syndrome (Terminal Burrowing):** An instinctual behavior where the victim crawls into small, enclosed spaces. 3. **Post-mortem Findings:** Look for **Wischnewski spots** (hemorrhagic gastric erosions) and bright pink/cherry-red discoloration of the skin (due to oxyhemoglobin shift). 4. **J-Wave (Osborn Wave):** A characteristic ECG finding (deflection at the R-ST junction) seen when the temperature drops below 32°C.
Question 9: Which of the following is an example of a cold burn?
- A. Frostbite
- B. Trench foot in soldiers
- C. Immersion foot occurring in shipwrecked persons
- D. All of the above (Correct Answer)
Explanation: **Explanation:** In Forensic Medicine, **"Cold Burns"** (or localized cold injuries) refer to tissue damage resulting from exposure to low temperatures. These are categorized based on the severity of the cold and the presence of moisture. 1. **Frostbite (Option A):** This is the most severe form of cold injury, occurring due to exposure to **freezing temperatures** (below 0°C). It involves actual crystallization of tissue water (ice crystal formation) and microvascular occlusion, leading to dry gangrene. 2. **Trench Foot (Option B):** Historically seen in soldiers, this occurs due to prolonged exposure (hours to days) to **non-freezing cold** (0–10°C) combined with **dampness/moisture** and limb immobility. 3. **Immersion Foot (Option C):** Similar to trench foot, this occurs in shipwreck survivors whose feet are submerged in cold water for long periods. The mechanism involves vasoconstriction followed by vasodilation and nerve damage. Since all three conditions represent localized tissue injury caused by cold exposure, **Option D (All of the above)** is the correct answer. **High-Yield Clinical Pearls for NEET-PG:** * **Chilblains (Pernio):** The mildest form of cold injury characterized by itchy, red/purple swellings on fingers or toes due to non-freezing damp cold. * **Hunting’s Reaction:** A protective physiological mechanism where alternating vasoconstriction and vasodilation occur to maintain digit temperature during cold exposure. * **Post-mortem finding:** A characteristic sign of death from hypothermia is **"Cherry Red"** discoloration of the skin (due to oxyhemoglobin retention) and **Wischnewski spots** (gastric mucosal erosions). * **Paradoxical Undressing:** A forensic phenomenon where a hypothermic victim removes clothes due to a false sensation of heat caused by terminal vasodilation.
Question 10: Which of the following is NOT a mechanism by which lightning causes injury?
- A. Compressed air pushed in front of the current (Correct Answer)
- B. Direct effect of electric current
- C. Super heated air
- D. Expanded and repelled air
Explanation: **Explanation:** Lightning is a massive atmospheric discharge of static electricity. To understand the mechanisms of injury, one must distinguish between the effects of the electrical current itself and the physical displacement of air caused by the extreme heat. **Why Option A is the Correct Answer:** In a lightning strike, the air is heated to approximately 30,000°C almost instantaneously. This causes the air to **expand and repel** outward with explosive force (creating a vacuum). There is **no "compressed air pushed in front"** of the current; rather, the injury occurs due to the **blast effect** caused by the sudden expansion and the subsequent rush of air back into the vacuum. **Analysis of Other Options:** * **B. Direct effect of electric current:** This is the primary mechanism. The high-voltage DC current causes cardiac arrhythmia (asystole), respiratory paralysis, and deep thermal burns. * **C. Superheated air:** The lightning bolt heats the surrounding air to temperatures hotter than the surface of the sun. This causes flash burns to the skin and can ignite clothing. * **D. Expanded and repelled air:** As mentioned, the rapid heating causes air to expand at supersonic speeds. This creates a "mechanical blast" similar to an explosion, which can throw the victim, causing blunt force trauma or tympanic membrane rupture. **High-Yield Clinical Pearls for NEET-PG:** * **Lichtenberg Figures (Arborescent/Filigree burns):** Pathognomonic transient, fern-like skin patterns caused by the extravasation of RBCs into the dermis. They appear within 1 hour and disappear within 24 hours. * **Keraunoparalysis:** Transient paralysis, numbness, and cyanosis of lower limbs following a strike (due to autonomic vasospasm). * **Cause of Death:** Immediate death is usually due to **cardiac arrest (asystole)** or medullary respiratory center paralysis. * **Metallization:** Fine metal particles from jewelry/coins may be fused into the skin due to the current.
Want unlimited practice?
Get full access to all questions, explanations, and performance tracking.
Start For Free