Fibrosis-4 Index Finds New Role in Rheumatoid Arthritis
METHODOLOGY:
Researchers conducted a cross-sectional study to calculate FIB-4 index values in patients with RA and assess their relationship with disease characteristics and cardiovascular comorbidities.
They recruited 465 adults with RA (mean age, 55 years; 81% women) between 2019 and 2021, all of whom had a disease duration of at least 1 year and were taking ≤ 10 mg/day of prednisone or an equivalent dose.
The FIB-4 index was calculated using an equation considering age, platelet count, and alanine aminotransferase and aspartate aminotransferase levels, with the risk for fibrosis classified as low, indeterminate, or high on the basis of defined cutoff values.
Participants underwent evaluations for disease activity, complete lipid profiles, the presence of metabolic syndrome, anthropometric parameters, and insulin resistance using the Homeostatic Model Assessment, as well as carotid ultrasound to detect subclinical carotid atherosclerosis.
Cardiovascular risk was estimated using t he Systematic Coronary Risk Evaluation-2 (SCORE2) tool.
TAKEAWAY:
SCORE2 classified 66% of patients with RA as having low cardiovascular risk, 28% as having moderate cardiovascular risk, and 6% as having high cardiovascular risk; the prevalence of cardiovascular risk factors was generally high.
FIB-4 values indicated an indeterminate risk for fibrosis in 18% of patients with RA and a high risk in 1%, whereas 81% had a low risk.
Several factors, including age ( P < .001), cardiovascular risk measured by SCORE2 ( P < .001), and metabolic syndrome ( P = .008), showed positive correlations with FIB-4 values; however, in multivariable analysis, the presence of hypertension, insulin resistance indices, and statin use maintained significant positive associations.
< .001), cardiovascular risk measured by SCORE2 ( < .001), and metabolic syndrome ( = .008), showed positive correlations with FIB-4 values; however, in multivariable analysis, the presence of hypertension, insulin resistance indices, and statin use maintained significant positive associations. Disease activity (measured by multiple scores), acute phase reactants, and the presence of rheumatoid factor or anti–citrullinated protein antibodies showed no significant association with FIB-4 values, whereas the presence of erosions at recruitment was associated with FIB-4 ( P = .044).
IN PRACTICE:
"This index may serve as a surrogate marker for CV [cardiovascular] risk and insulin resistance in patients with RA," the authors concluded.
SOURCE:
This study was led by Iván Ferraz-Amaro, Hospital Doctor Negrín, Las Palmas de Gran Canaria, Spain. It was published online on May 21, 2025, in Rheumatology .
LIMITATIONS:
The cross-sectional design of this study prevented the establishment of causal relationships between variables. Data on hepatic ultrasound or liver biopsy were lacking. Information on cumulative methotrexate use was not collected.
DISCLOSURES:
This study was supported by a grant from Instituto de Salud Carlos III and additional funds from the European Union. Two authors reported receiving grants or research support and consultation fees from speaker bureaus associated with several pharmaceutical and healthcare companies, including AbbVie, Roche, and GSK.
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