## Established Risk Factors for Pancreatic Adenocarcinoma **Key Point:** Pancreatic cancer has a multifactorial etiology with several well-documented modifiable and non-modifiable risk factors. ### Confirmed Risk Factors | Risk Factor | Mechanism / Evidence | |---|---| | **Smoking** | 2–3× increased risk; dose-dependent; accounts for ~25% of cases | | **Chronic pancreatitis** | Increases risk 10–50×; chronic inflammation → dysplasia | | **Obesity & Type 2 DM** | Insulin resistance, chronic hyperglycemia, adipokine dysregulation | | **Alcohol use** | Indirect risk via pancreatitis; weak independent association | | **Hereditary syndromes** | BRCA2, Lynch syndrome, familial adenomatous polyposis (FAP), CDKN2A mutations | | **Cirrhosis** | Chronic liver disease increases risk | | **Hepatitis B & C** | Chronic viral hepatitis → cirrhosis → increased risk | ### Why Hereditary Hemochromatosis Is NOT a Risk Factor **High-Yield:** Hereditary hemochromatosis (HFE gene mutation) is a well-established risk factor for **hepatocellular carcinoma** and **cholangiocarcinoma** via cirrhosis, but **NOT** for pancreatic adenocarcinoma. The iron overload in hemochromatosis primarily damages the liver and heart; pancreatic involvement in hemochromatosis (hemochromatotic cardiomyopathy, arthropathy) does not translate to increased pancreatic cancer risk. **Clinical Pearl:** Students often conflate all iron-storage diseases with pancreatic pathology. Hemochromatosis causes pancreatic fibrosis and diabetes ("bronze diabetes"), but fibrosis alone is not a risk factor for malignancy in this context—unlike chronic pancreatitis, which carries inflammatory dysplasia. **Warning:** Do not confuse hemochromatosis with hereditary pancreatitis (PRSS1 mutations) or familial pancreatic cancer syndromes, which ARE risk factors. [cite:Harrison 21e Ch 297]
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