Objective To investigate the value of international standardized ratio-to-platelet ratio (INPR) versus aspartate aminotransferase-to-platelet ratio index (APRI) and fibrosis-4 (FIB-4) in the diagnosis of liver fibrosis in patients with primary cholangitis (PBC).Methods A retrospective analysis was performed for the patients who underwent liver biopsy and were diagnosed with PBC in The First Affiliated Hospital of Zhengzhou University from October 2013 to March 2021. Scheuer score was used to systematically evaluate the degree of liver fibrosis (S0-S4 stage). According to the results of liver biopsy, the degree of liver fibrosis was classified as significant liver fibrosis (≥S2), progressive liver fibrosis (≥S3), and liver cirrhosis (S4). Related data including general information, liver function, routine blood test results, and blood coagulation were collected, and related formulas were used to calculate the values of the noninvasive serological models INPR, APRI, and FIB-4. The Kruskal-Wallis H test was used for comparison of continuous data between multiple groups, and the chi-square test was used for comparison of categorical data between multiple groups. A Spearman correlation analysis was used to evaluate the correlation between noninvasive models and liver fibrosis stage. The receiver operating characteristic (ROC) curve was used to evaluate the efficacy of the noninvasive serological models in the diagnosis of liver fibrosis degree, and the DeLong method was used for comparison of the area under the ROC curve (AUC).Results A total of 143 patients with PBC were enrolled in the study, among whom 4 had stage S0 liver fibrosis, 50 had stage S1 liver fibrosis, 46 had stage S2 liver fibrosis, 26 had stage S3 liver fibrosis, and 17 had stage S4 liver fibrosis. There was a significant difference in INPR value between the PBC patients with different liver fibrosis degrees (χ2=27.347, P < 0.001). INPR value gradually increased with the aggravation of liver fibrosis degree, and INPR was positively correlated with liver fibrosis degree (r=0.419, P < 0.01). The ROC curve analysis showed that INPR, APRI, and FIB-4 had an AUC of 0.691, 0.706, and 0.742, respectively, in the diagnosis of significant liver fibrosis (≥S2) in PBC patients, at the corresponding cut-off values of 0.63, 0.59, and 2.68, respectively. INPR, APRI, and FIB-4 had an AUC of 0.731, 0.675, and 0.756, respectively, in the diagnosis of progressive hepatic fibrosis (≥S3) in PBC patients, at the corresponding cut-off values of 0.64, 1.23, and 4.63, respectively. INPR, APRI, and FIB-4 had an AUC of 0.820, 0.786, and 0.818, respectively, in the diagnosis of liver cirrhosis (S4) in PBC patients, at the corresponding cut-off values of 0.95, 1.26, and 4.63, respectively. In the evaluation of significant liver fibrosis, progressive liver fibrosis, and liver cirrhosis, there was no significant difference in AUC between INPR and APRI/FIB-4 (all P > 0.05).Conclusion INPR is a simple and accurate noninvasive model for the evaluation of liver fibrosis and has a certain value in the diagnosis of liver fibrosis in PBC.
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