Occupational Cancers: Intro - Workplace Woes
- Definition: Cancers due to workplace exposure to carcinogens (chemical, physical, biological).
- Latency Period: Prolonged delay (10-40+ years) from first exposure to diagnosis.
⭐ The long, variable latency period (often decades) is a hallmark of occupational cancers.
- Attributable Fraction (AF): Proportion of cancers from occupational exposures. Calculated as $AF = \frac{(RR-1)}{RR} \times 100%$, where RR is Relative Risk.
- Global Burden: An estimated 2-8% of all cancers worldwide are caused by occupational exposures. However, recent classifications, such as the re-evaluation of firefighting as a human carcinogen (Group 1) by the International Agency for Research on Cancer (IARC) in June 2022, indicate that this percentage might be an underestimate and is subject to ongoing research and reclassification of various occupational exposures.
- Common Sites: Lungs, pleura, bladder, skin, liver, hematopoietic system (e.g., leukemia).
- Routes of Exposure:
- Inhalation (dusts, fumes, gases) - primary route.
- Dermal absorption (solvents, pesticides).
- Ingestion (contaminated hands, food, water).
Occupational Cancers: Carcinogens - Usual Suspects
Key occupational carcinogens and their primary targets:
| Carcinogen | Target Organ(s) / Cancer Type(s) | Example Occupation(s) |
|---|---|---|
| Asbestos | Mesothelioma (pleura, peritoneum), Lung cancer | Mining, insulation, shipbuilding, construction, textiles |
| Benzene | Leukemia (esp. Acute Myeloid Leukemia - AML) | Petrochemical, rubber, shoe manufacturing, printing, lab workers |
| Vinyl chloride | Angiosarcoma of liver | Plastics (PVC) production, rubber industry |
| Aromatic amines (e.g., Benzidine, β-Naphthylamine) | Bladder cancer (transitional cell carcinoma) | Dye, rubber, textile industries, chemical plants, hairdressers |
| Polycyclic Aromatic Hydrocarbons (PAHs) (e.g., Soot, Tar, Mineral oils) | Skin (scrotal, non-melanoma), Lung, Bladder cancer | Chimney sweeps, coke oven workers, road paving, aluminum production, mechanics |
| Chromium (VI) compounds | Lung cancer, Nasal & paranasal sinus cancer | Chrome plating, welding (stainless steel), pigment & dye manufacturing, leather tanning |
| Nickel compounds | Lung cancer, Nasal & paranasal sinus cancer | Nickel refining, electroplating, battery manufacturing, welding |
| Arsenic & inorganic compounds | Skin cancer (Bowen's disease, squamous cell), Lung cancer, Liver angiosarcoma, Bladder cancer | Smelting (copper, lead, zinc), pesticide/herbicide mfg., semiconductor industry, glass making |
| Radon (and its decay products) | Lung cancer (esp. small cell) | Underground mining (uranium, tin), poorly ventilated basements |
| Wood dust (hardwood) | Nasal adenocarcinoma (ethmoid, maxillary sinus) | Woodworking, carpentry, furniture making, sawmills, paper mills |
| Silica (crystalline) | Lung cancer (often with silicosis) | Mining, quarrying, sandblasting, construction, ceramics, foundry work |
- Benzene → AML (Acute Myeloid Leukemia)
- Aromatic amines → Vesical (Bladder) cancer
- Vinyl chloride → Angiosarcoma of Liver
⭐ Asbestos exposure is strongly linked to mesothelioma, a rare and aggressive cancer of the pleura or peritoneum. This risk is significantly amplified by concurrent smoking for lung cancer, but not for mesothelioma.
Occupational Cancers: Prevention & Law - Guarding Workforce
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High‑Yield Points - ⚡ Biggest Takeaways
- Asbestos exposure is strongly linked to mesothelioma and lung cancer.
- Benzene is a known cause of leukemia, particularly Acute Myeloid Leukemia (AML).
- Vinyl chloride is associated with angiosarcoma of the liver.
- Aromatic amines (e.g., benzidine, 2-naphthylamine) cause bladder cancer.
- Arsenic exposure can lead to skin cancer, lung cancer, and liver angiosarcoma.
- Nickel and chromium compounds are implicated in lung and nasal cancers.
- Wood dust is a risk factor for nasal adenocarcinoma.
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