## Most Common Aetiological Factor for HCC in India **Key Point:** Hepatitis B virus (HBV) infection is the most common aetiological factor for hepatocellular carcinoma in India and Asia-Pacific regions, accounting for approximately 50–60% of HCC cases in endemic areas. ### Geographic and Epidemiological Context India is an intermediate-to-high HBsAg prevalence region (2–5% population prevalence), making HBV-related cirrhosis and HCC a major public health burden. The virus causes chronic infection in ~5–10% of infected adults, leading to progressive fibrosis and eventual carcinogenesis through: 1. **Chronic inflammation** → hepatocyte necrosis and regeneration 2. **Viral integration** → insertional mutagenesis and HBx protein–mediated oncogenic signalling 3. **Cirrhosis development** → increased risk of malignant transformation ### Comparative Aetiological Frequencies in India | Aetiological Factor | Frequency in India | Mechanism | | --- | --- | --- | | **Hepatitis B** | 50–60% | Chronic inflammation, viral integration, HBx oncogene | | Hepatitis C | 10–20% | Chronic inflammation, cirrhosis, core protein effects | | Alcohol | 10–15% | Cirrhosis, oxidative stress, acetaldehyde toxicity | | NAFLD | 5–10% | Emerging; metabolic syndrome, insulin resistance | | Cryptogenic cirrhosis | 5–10% | Presumed NAFLD or autoimmune | **High-Yield:** In Western countries, HCV and alcohol dominate; in Asia, HBV is the undisputed leader. This distinction is critical for exam questions anchored to Indian epidemiology. ### Clinical Pearl HBV-related HCC can develop even without cirrhosis (10–15% of cases), particularly in patients with high viral load and active hepatitis. This is less common with HCV, where cirrhosis almost always precedes malignancy. [cite:Robbins 10e Ch 18]
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