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Insulin resistance among patients with chronic hepatitis C: etiology and impact on treatment
1Division of Gastroenterology and Hepatology, Brooke Army Medical Center, Fort Sam Houston, Texas 78324, USA. Stephen.Harrison@AMEDD.ARMY.MIL
Abstract:
Insulin resistance is extremely common and frequently is associated with comorbid conditions such as cardiovascular disease, hypertension, obesity, infertility, and neurodegeneration. In addition, insulin resistance is the driving force for type 2 diabetes mellitus. Interestingly, co-existence of insulin resistance and chronic hepatitis C occurs more often than predicted by chance, with recent estimates indicating that 30% to 70% of patients with chronic hepatitis C display some evidence of insulin resistance. Recent research revealed several molecules, including tumor necrosis factor alpha, suppressor of cytokine signaling 1 and 3 proteins, insulin-receptor substrates 1 and 2, and other adipocytokines, potentially are involved in the development of insulin resistance in patients with chronic hepatitis C. Unfortunately, baseline insulin resistance has a negative impact on treatment outcomes in patients with chronic hepatitis C. However, successfully managing insulin resistance or diabetes mellitus in these patients may improve patients' likelihoods of successful outcomes with antiviral therapy. Likewise, eradication of hepatitis C virus in patients with insulin resistance or diabetes mellitus appears to improve glucose metabolism. Although adjunctive therapies such as insulin sensitizers and weight loss often are recommended, their ability to improve antiviral treatment response in patients with chronic hepatitis C is unproven. Studies are under way to determine whether improving insulin sensitivity results in better outcomes in patients receiving pegylated interferon alfa plus ribavirin therapy for chronic hepatitis C.
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