## Risk Factors for Laryngeal Carcinoma ### Established Risk Factors **Key Point:** Tobacco and alcohol are the two most significant modifiable risk factors for laryngeal squamous cell carcinoma, with a synergistic effect when combined. **High-Yield:** HPV-16 and HPV-18 are increasingly recognized as risk factors, particularly in oropharyngeal and laryngeal cancers, especially in younger patients without traditional smoking/alcohol exposure. **Clinical Pearl:** GERD and chronic laryngitis cause chronic irritation and inflammation of the laryngeal mucosa, increasing malignant transformation risk over time. ### Inhaled Corticosteroids — NOT a Risk Factor **Warning:** Inhaled corticosteroids (ICS) are NOT established risk factors for laryngeal carcinoma. In fact, they are used therapeutically in conditions like laryngeal papillomatosis. Prolonged use of ICS for asthma is safe and does not increase laryngeal cancer risk. This is a common misconception in exam questions. **Key Point:** ICS are topical agents with minimal systemic absorption when used as prescribed; they do not cause malignant transformation of laryngeal epithelium. ### Summary Table of Risk Factors | Risk Factor | Mechanism | Evidence Level | | --- | --- | --- | | Tobacco smoking | Carcinogenic polycyclic aromatic hydrocarbons | Definite | | Alcohol consumption | Direct mucosal irritation; acetaldehyde toxicity | Definite | | HPV-16/18 | Viral oncoproteins E6/E7 inactivate p53 and Rb | Strong | | GERD/chronic laryngitis | Chronic inflammation → dysplasia | Moderate | | Inhaled corticosteroids | None — protective in some conditions | Refuted | | Occupational exposures (asbestos, nickel) | Carcinogenic dust inhalation | Moderate |
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