Effects of Pentoxifylline on Non-Alcoholic Steatohepatitis: A Randomized, Double-Blind, Placebo-Controlled Trial in Iran

Background: Non-alcoholic steatohepatitis (NASH) is a progressive form of nonalcoholic fatty liver disease. Several studies suggest that pentoxifylline (PTX) can improve the disease outcome. Objectives: We aimed to compare the effect of pentoxifylline with placebo on liver aminotransferases and cytokines, including interleukin 6 (IL-6), tumor necrosis factor alpha (TNF-alpha), and interleukin 8 (IL-8) in patients with NASH. Patients and Methods: Thirty patients with NASH were included in the study, based on ultrasonography and 1.5-fold mean change from baseline serum levels of liver aminotransferases. Patients with NASH were randomized to receive 1200 mg PTX (the intervention group) or placebo (the placebo group) for 6 months. The serum levels of liver aminotransferases and cytokines were compared between the intervention and placebo groups, at various time points. Results: The serum levels of liver aminotransferases were significantly reduced at 3 months and at 6 months, compared with baseline, in both groups. The serum levels of IL-6 were significantly decreased, in both groups, only at 6 months, compared with baseline. Compared to the placebo group, the serum level of TNF-alpha was significantly decreased in the intervention group, at 6 months. The serum level of IL-8 was increased, in both groups, after 6 months, without reaching clinical significance. There was no significant difference in serum levels of liver aminotransferases and cytokines, between intervention and placebo groups. Conclusions: Decreases in the serum levels of liver aminotransferases and cytokines, in both groups, are related to low-calorie diets and exercise, rather than PTX.