Hannes Hagström1, Mats Talbäck2, Anna Andreasson3, Göran Walldius2, Niklas Hammar2. 1. Division of Hepatology, Department of Upper GI Diseases, Karolinska University Hospital, Stockholm, Sweden; Clinical Epidemiology Unit, Department of Medicine, Solna, Karolinska Institutet, Stockholm, Sweden; Department of Medicine, Huddinge, Karolinska Institutet, Stockholm, Sweden. Electronic address: hannes.hagstrom@ki.se. 2. Unit of Epidemiology, Institute of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden. 3. Stress Research Institute, Stockholm University, Stockholm, Sweden.
Abstract
BACKGROUND & AIMS: It is unclear whether the identification of individuals at risk of cirrhosis using non-invasive tests can be improved by repeated measurements. Herein, we tested whether repeated measurements of fibrosis-4 index (FIB-4) could improve the identification of individuals at risk of severe liver disease. METHODS: Data were derived from the population-based Swedish AMORIS cohort with baseline examinations from 1985-1996. FIB-4 was calculated at 2 time points within 5 years. Thereafter, we associated changes in FIB-4 with outcomes. Incident severe liver disease data was ascertained through linkage to Swedish national registers until 2011. Hazard ratios (HRs) and CIs for outcomes were calculated using Cox regression. RESULTS: Of 126,942 individuals with available FIB-4 data, 40,729 (32.1%) underwent a second test within 5 years (mean interval 2.4 years). During 613,376 person-years of follow-up, 581 severe liver disease events were documented (0.95/1,000 person-years). An increase of 1 unit in FIB-4 was associated with an elevated risk of severe liver disease (adjusted hazard ratio [aHR] 1.81; 95% CI 1.67-1.96). Transitioning from a low- or intermediate- to a high-risk group was associated with an increased risk of severe liver disease compared with those consistently in the low-risk group (aHR 7.99 and 8.64, respectively). A particularly increased risk of severe liver disease was found in individuals defined as high risk at both tests (aHR 17.04; 95% CI 11.67-24.88). However, almost half of all events occurred in those consistently in the low-risk group. CONCLUSIONS: Repeated testing of FIB-4 within 5 years improves the identification of individuals at an increased risk of severe liver disease in the general population. However, the sensitivity is comparatively low and improved tests are needed for screening in a general population or primary care setting. LAY SUMMARY: The fibrosis-4 scoring system is often used to estimate the risk of advanced fibrosis in liver diseases. Herein, we found that changes in this score over time are associated with the risk of future severe liver disease in a population-based cohort. However, even if the prediction is improved by repeated testing, the overall ability of the score to predict future events is relatively low.
BACKGROUND & AIMS: It is unclear whether the identification of individuals at risk of cirrhosis using non-invasive tests can be improved by repeated measurements. Herein, we tested whether repeated measurements of fibrosis-4 index (FIB-4) could improve the identification of individuals at risk of severe liver disease. METHODS: Data were derived from the population-based Swedish AMORIS cohort with baseline examinations from 1985-1996. FIB-4 was calculated at 2 time points within 5 years. Thereafter, we associated changes in FIB-4 with outcomes. Incident severe liver disease data was ascertained through linkage to Swedish national registers until 2011. Hazard ratios (HRs) and CIs for outcomes were calculated using Cox regression. RESULTS: Of 126,942 individuals with available FIB-4 data, 40,729 (32.1%) underwent a second test within 5 years (mean interval 2.4 years). During 613,376 person-years of follow-up, 581 severe liver disease events were documented (0.95/1,000 person-years). An increase of 1 unit in FIB-4 was associated with an elevated risk of severe liver disease (adjusted hazard ratio [aHR] 1.81; 95% CI 1.67-1.96). Transitioning from a low- or intermediate- to a high-risk group was associated with an increased risk of severe liver disease compared with those consistently in the low-risk group (aHR 7.99 and 8.64, respectively). A particularly increased risk of severe liver disease was found in individuals defined as high risk at both tests (aHR 17.04; 95% CI 11.67-24.88). However, almost half of all events occurred in those consistently in the low-risk group. CONCLUSIONS: Repeated testing of FIB-4 within 5 years improves the identification of individuals at an increased risk of severe liver disease in the general population. However, the sensitivity is comparatively low and improved tests are needed for screening in a general population or primary care setting. LAY SUMMARY: The fibrosis-4 scoring system is often used to estimate the risk of advanced fibrosis in liver diseases. Herein, we found that changes in this score over time are associated with the risk of future severe liver disease in a population-based cohort. However, even if the prediction is improved by repeated testing, the overall ability of the score to predict future events is relatively low.
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