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Angulo, Paul; Bugianesi, Elisabetta; Bjornsson, Einar S; Charatcharoenwitthaya, Phunchai; Mills, Peter R; Barrera, Francisco; Haflidadottir, Svanhildur; Day, Christopher P; George, Jacob
Gastroenterology (New York, N.Y. 1943), 10/2013, Volume: 145, Issue: 4Journal Article
Background & Aims Some patients with nonalcoholic fatty liver disease (NAFLD) develop liver-related complications and have higher mortality than other patients with NAFLD. We determined the accuracy of simple, noninvasive scoring systems in identification of patients at increased risk for liver-related complications or death. Methods We performed a retrospective, international, multicenter cohort study of 320 patients diagnosed with NAFLD, based on liver biopsy analysis through 2002 and followed through 2011. Patients were assigned to mild-, intermediate-, or high-risk groups based on cutoff values for 2 of the following: NAFLD fibrosis score, aspartate aminotransferase/platelet ratio index, FIB-4 score, and BARD score. Outcomes included liver-related complications and death or liver transplantation. We used multivariate Cox proportional hazard regression analysis to adjust for relevant variables and calculate adjusted hazard ratios (aHRs). Results During a median follow-up period of 104.8 months (range, 3−317 months), 14% of patients developed liver-related events and 13% died or underwent liver transplantation. The aHRs for liver-related events in the intermediate-risk and high-risk groups, compared with the low-risk group, were 7.7 (95% confidence interval CI: 1.4−42.7) and 34.2 (95% CI: 6.5−180.1), respectively, based on NAFLD fibrosis score; 8.8 (95% CI: 1.1−67.3) and 20.9 (95% CI: 2.6−165.3) based on the aspartate aminotransferase/platelet ratio index; and 6.2 (95% CI: 1.4−27.2) and 6.6 (95% CI: 1.4−31.1) based on the BARD score. The aHRs for death or liver transplantation in the intermediate-risk and high-risk groups compared with the low-risk group were 4.2 (95% CI: 1.3−13.8) and 9.8 (95% CI: 2.7−35.3), respectively, based on the NAFLD fibrosis scores. Based on aspartate aminotransferase/platelet ratio index and FIB-4 score, only the high-risk group had a greater risk of death or liver transplantation (aHR = 3.1; 95% CI: 1.1−8.4 and aHR = 6.6; 95% CI: 2.3−20.4, respectively). Conclusions Simple noninvasive scoring systems help identify patients with NAFLD who are at increased risk for liver-related complications or death. NAFLD fibrosis score appears to be the best indicator of patients at risk, based on HRs. The results of this study require external validation.
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