Abstract
Background
This study aimed to compare the diagnostic accuracy of transient elastography (TE) and biopsy for the detection of liver fibrosis in children with chronic hepatitis B (CHB).
Methods
This single-center prospective study included 157 CHB children aged 0–6 years. All patients underwent liver stiffness measurement (LSM) by TE and liver biopsy, separated by an interval of less than 1 week.
Results
The LSM, aspartate aminotransferase-platelet ratio index (APRI), and fibrosis-4 index (FIB-4) were positively correlated with activity grade and fibrosis stage in CHB children. The areas under the receiver operating characteristic curves (AUCs) of LSM for identifying significant (F ≥ 2) and advanced (F ≥ 3) fibrosis were 0.732 and 0.941, respectively. The cut-off values, specificity, and sensitivity for significant fibrosis were 5.6 kPa, 75.7%, and 67.4%, respectively; the corresponding values for advanced fibrosis were 6.9 kPa, 91.5%, and 81.3%, respectively. Compared to LSM, the overall diagnostic performances of APRI and FIB-4 for significant and advanced fibrosis were suboptimal, with low AUCs and sensitivity. Since LSM, platelet, and Log10 (hepatitis B surface antigen) were independent factors associated with the fibrosis stage (F < 2 and F ≥ 2), they were used to formulate the “LPS” index for the prediction of F ≥ 2. The AUC of LPS (for F ≥ 2) was higher than that of LSM (0.792 vs. 0.732, p < 0.05), and had an improved sensitivity (76.6% vs. 67.4%).
Conclusions
TE is a promising technology for the diagnosis of advanced fibrosis in CHB children aged 0–6 years.
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Introduction
Hepatitis B virus (HBV) infection is one of the most common causes of chronic liver disease worldwide, especially in China where more than 80 million adults and 37,000 children are affected [1, 2]. Although the natural history of chronic HBV infections in children remains poorly understood, a limited number of studies have shown that 1–5% of hepatitis B e antigen (HBeAg)-positive children develop cirrhosis before adulthood [3,4,5,6]. In addition, 25% of adult patients who acquire HBV infection in childhood will develop liver cancer or cirrhosis, both of which are associated with high morbidity and mortality [7]. Thus, there is a critical need to decrease the risk of disease progression to cirrhosis, and develop a functional cure for chronic hepatitis B (CHB). One of the most important indicators for antiviral treatment is histological evidence of necro-inflammation and fibrosis, according to the guidelines of the European Society of Paediatric Gastroenterology, Hepatology, and Nutrition (ESPGHAN), as well as the American Association for the Study of Liver Diseases [8]. Therefore, the early diagnosis of the extent of liver inflammation and fibrosis is important for the treatment of CHB during childhood [8, 9].
Currently, liver biopsy remains the gold standard for determining the degree of liver inflammation and fibrosis and is integral for guiding antiviral treatment in children with CHB [8, 9]. Nevertheless, follow-up biopsies are required to evaluate the efficacy of antiviral treatment [10]; these procedures are associated with pain, additional expenses, and risks of post-procedure hospitalization [11]. Moreover, a liver biopsy requires highly skilled physicians and medical devices. Thus, there is a need for the development of non-invasive tests to diagnose liver cirrhosis in children with CHB, in order to avoid the risks and costs associated with liver biopsies.
The aspartate aminotransferase (AST)-platelet (PLT) ratio index (APRI) and fibrosis-4 index (FIB-4) scores, obtained by evaluating laboratory parameters, have been used to identify fibrosis stages in adult patients with CHB. However, a previous study has shown that the APRI and FIB-4 are inadequate due to high rates of misclassification [12]; the diagnostic performance of the APRI and FIB-4 in children with CHB remains unknown. Transient elastography (TE) is a novel noninvasive assessment tool that has been widely adopted to diagnose liver fibrosis stage and monitor the development of chronic liver diseases (e.g., CHB and chronic hepatitis C [CHC]) in adult patients, due to its accuracy and reproducibility [13]. Several studies have shown that the liver stiffness measurement (LSM) determined via TE is useful for the assessment of liver fibrosis in children with chronic liver disease [14, 15]. Although the LSM has been used to evaluate hepatitis B- and C-related fibrosis in children across three studies, their results have been limited by small sample sizes, restricted patient populations (primarily adolescents and young adults), as well as the inclusion of liver diseases due to multiple causes [11, 15, 16]. To date, no studies have assessed the effectiveness of TE in the detection of liver fibrosis in children with CHB. Therefore, the purpose of this study was to compare the diagnostic accuracy of TE and biopsy for the detection of liver fibrosis in children with CHB.
Patients and methods
Patient recruitment
This prospective study enrolled 157 CHB patients (aged 0–6 years) from June 2015 to March 2020 at Fifth Medical Center of Chinese PLA General Hospital. Patients were included if they were aged ≤ 6 years; met the criteria for CHB, according to the guidelines for prevention and treatment of CHB in China [17]; and underwent LSM and liver biopsy, separated by an interval of less than 1 week. and written informed consent was obtained from the parent or legal guardian of the child subjects. The exclusion criteria comprised the following: (1) white blood cells < 2.75 × 109/L, PLT < 80 × 109/L, total bilirubin > 51 μmol/L, alanine aminotransferase (ALT) ≥ 400 IU/L, serum creatinine > 133 μmol/L, or international normalized ratio > 1.5; (2) patients positive for hepatitis A/C/delta virus, human immunodeficiency virus, or a chronic liver disease other than CHB (e.g., autoimmune hepatitis, Wilson’s disease, hepatolenticular degeneration, and hepatocellular carcinoma); (3) evidence of decompensation (i.e., clinical ascites); and (4) any other serious physical and mental illnesses. Written informed consent was obtained from the parent or legal guardian of all child patients.
Clinical and laboratory parameters
Demographic data, including age, gender, body weight, and height (Body Mass Index [BMI] = body weight in kg/[height in meters]2), were collected. Routine blood tests, liver function tests, abdominal ultrasound examination, and plasma HBV deoxyribonucleic acid (DNA) and serological HBV marker (including HBeAg and hepatitis B surface antigen [HBsAg]) quantification were performed. The APRI and FIB-4 were calculated by using the following formula, as previously reported [12]: APRI = [AST level (IU/L)/AST upper level of normal (IU/L)]/PLT count (109/L) × 100 and FIB-4 = [age (years) × AST level (IU/L)]/[PLT count (109/L) × ALT level (IU/L)].
Liver histology and LSMs
After the laboratory examinations were performed, ultrasonic-guided liver biopsies were carried out in all patients using a 1-s needle biopsy. Liver specimens were prepared for histological evaluation by a senior pathologist, who was blinded to the LSM results, according to the meta-analysis of histological data for viral hepatitis (METAVIR) scoring system [18]. The LSM was expressed in kPa, and measured by a certified and experienced physician (blinded to the liver biopsy results) using the Fibroscan® and S probe (Echosens, France). The LSM results were only considered to be reliable when an interquartile range (IQR)/LSM of ≤ 0.3 was obtained, across a maximum of 10 validated measurements.
Statistical analysis
Quantitative variables are expressed as the mean ± standard deviation or median and IQR; categorical variables are expressed as the number and percentage of patients. Quantitative variables were compared using the Student t test/one-way analysis of variance for normally distributed variables, or Tamhane’s T2 test for non-normally distributed variables. Categorical variables were compared using the Chi-squared test. Correlations were assessed using Spearman's rank correlation coefficient, and factors associated with the degree of liver fibrosis were identified with a logistic regression analysis. The diagnostic value of the LSM was evaluated based on the following: sensitivity; specificity; positive and negative predictive values; positive and negative likelihood ratios; and the area under the receiver operating characteristic (ROC) curve (AUC), as determined via the Hanley-McNeil test. The LSM cut-off values for predicting the different stages of liver fibrosis were determined at the highest sensitivity and specificity. All statistical analyses were performed using SPSS 25.0 statistical software (Armonk, NY, USA). The level of statistical significance was set at p < 0.05.
Results
Patient demographic and laboratory variables
Among the 157 included patients, 92 (58.6%) were male; the median age was 3.0 years (IQR, 1.9, 4.1), and the median BMI was 16.01 (15.00, 17.28) (Table 1). The laboratory variables, including the white blood cell count (8.2 ± 2.1, 109/L), PLT count [287 (236, 344), 109/L], ALT level [73 (42, 145), IU/L], AST level [79 (55, 136), IU/L], Log10 HBV DNA quantification [7.87 (7.00, 8.01), IU/mL], and serological HBV markers are summarized in Table 1.
Noninvasive assessment indices for liver fibrosis and histological features
The LSM was 5.2 (4.4–6.1) kPa, ranging from 1.1 to 12.6 kPa (Table 1). The APRI and FIB-4 scores were 0.6778 (0.4573, 1.1296) and 0.0951 (0.0639, 0.1434), respectively. In addition, 59 patients presented with either mild or no necroinflammatory activity (A < 2); 96 and 2 patients were assigned scores of A2 and A3, respectively. Mild liver fibrosis, or a lack thereof (F0–F1), was observed in 111 patients; 30 patients had a score of F2, and 16 patients exhibited an advanced fibrosis (F ≥ 3) (Table 1).
Correlation between LSM, APRI and FIB-4 with activity grade and liver fibrosis stage
The activity grades were divided into two groups (A < 2 and A ≥ 2), and liver fibrosis stages were classified into three groups (F0–F1, F2, and F3–F4), in accordance with previous studies [14]. The distribution of the LSM, APRI, and FIB-4 according to activity grade and stages of liver fibrosis are displayed in Fig. 1. A comparative analysis showed that the A ≥ 2 group [5.5 (4.6–6.5) kPa] had a higher median LSM value than that of the A < 2 group [4.8 (4.1–5.4) kPa] (p < 0.001) (Fig. 1a). Patients classified with the F3–F4 stage had a significantly higher LSM compared to those with the F0–F1 (8.3 vs. 4.9 kPa; p < 0.001) and F2 (8.3 vs. 5.6 kPa; p < 0.001) stage. There was no significant difference in LSM values between patients in the F0–F1 stage and F2 stage (Fig. 1b). In terms of the APRI, the A ≥ 2 group had higher values compared to the A < 2 group (0.9726 vs. 0.4664, p < 0.001). Patients classified with the F3–F4 stage had significantly higher values than those classified with the F0–F1 stage (1.4040 vs. 0.5662, p < 0.05) (Fig. 1c and d). In addition, FIB-4 levels were higher in the A ≥ 2 group compared to the A < 2 group (0.1104 vs. 0.0814, p < 0.01); however, there were no significant differences in fibrosis stages among the three groups (F0–F1, 0.0896; F2, 0.1321; and F3–F4, 0.1337; all p > 0.05) (Fig. 1e and f).
We subsequently estimated the correlations between clinical and histological parameters (LSM, APRI, and FIB-4) with both activity grades (A < 2 and A ≥ 2) and liver fibrosis stages (F0–F1, F2, and F ≥ 3). The LSM (r = 0.275, p < 0.001), APRI (r = 0.478, p < 0.001), and FIB-4 (r = 0.249, p < 0.01) were all positively correlated with the degree of activity. All three laboratory and histological parameters were also positively correlated with the degree of fibrosis (LSM, r = 0.414, p < 0.001; APRI, r = 0.357, p < 0.001; FIB-4, r = 0.277, p < 0.001). These results suggest that the LSM, APRI, and FIB-4 are positively associated with the severity of liver inflammation and fibrosis in children with CHB.
Diagnostic value of the LSM, APRI, and FIB-4 for liver fibrosis stages
To further evaluate the performance of the LSM, APRI, and FIB-4 for the liver fibrosis stages, ROC curve analysis was performed for all patients. The AUCs of the LSM for the identification of fibrosis stages F ≥ 2 and F ≥ 3 among children with CHB were 0.732 (95% confidence interval [CI], 0.639–0.826) and 0.941 (95% CI 0.897–0.985), respectively (Table 2). The optimal cut-off values, specificity, and sensitivity for F ≥ 2 were 5.6 kPa, 75.7% (95% CI 66.6–83.3), and 67.4% (95% CI 52.0–80.5), respectively; the corresponding values for F ≥ 3 were 6.9 kPa, 91.5% (95% CI 85.6–95.5), and 81.3% (95% CI 54.4–96.0), respectively (Table 2; Fig. 2a and b). While the specificities of the APRI for the prediction of F ≥ 2 and F ≥ 3 were moderately higher than those of the LSM, both the AUCs and sensitivities of the APRI and FIB-4 for F ≥ 2 and F ≥ 3 were lower, especially for F ≥ 3 (Table 2; Fig. 2a and b). These results suggest that the LSM is more reliable than the APRI and FIB-4 for the assessment of advanced liver fibrosis; nevertheless, all three of these parameters were suboptimal for the identification of significant liver fibrosis.
Parameters independently associated with the F ≥ 2 fibrosis stage
A univariate analysis was performed to assess the potential associations between the fibrosis stage and both clinical and laboratory parameters (Table S1). The results indicated that ALT, AST, gamma-glutamyl transpeptidase, cholinesterase, PLT, HBeAg, HBsAg, Log10HBsAg, Log10HBV DNA, A ≥ 2, and LSM were significantly associated with the fibrosis stage (F ≥ 2) (all p < 0.05) (Table S1). LSM, PLT, and Log10HBsAg remained significantly associated with the fibrosis stage in the multivariate analysis (all p < 0.05) (Table 3).
Combination of LSM, PLT, and Log10HBsAg for the determination of the F ≥ 2 liver fibrosis stage
Since LSM had a relatively poor diagnostic accuracy for F ≥ 2 (Table 2; Fig. 2), LSM, PLT, and Log10HBsAg were combined as independent factors to create an algorithm for the prediction of the F ≥ 2 liver fibrosis stage. This algorithm was referred to as the LPS index: LSM, PLT, and Log10HBsAg = 0.511 × LSM − 0.006 × PLT − 0.682 × Log10HBsAg + 0.769. The results indicated that the AUC increased to 0.792 (95% CI 0.720–0.852), which was higher than that of LSM (0.792 vs. 0.732, p < 0.05) (Table 4 and Fig. S1). Furthermore, the sensitivity increased by almost 10% (76.7% vs. 67.4%) (Table 4 and Fig. S1). Taken together, these findings demonstrate that compared to LSM, the combination of LSM, PLT, and Log10HBsAg can better predict the F ≥ 2 liver fibrosis stage, with a higher AUC and greater sensitivity.
Discussion
This study is the first to report that the LSM is a superior noninvasive index for predicting the HBV-related liver fibrosis stage in children aged 0–6 years, compared to APRI and FIB-4 scores. Furthermore, we found that the LSM was better able to distinguish the F0–F2 stage from the F3–F4 stage (AUC 0.941), compared to the F0–F1 and F2–F4 stages (AUC 0.732). This suggests that the LSM is particularly effective for the diagnosis of liver fibrosis in the F ≥ 3 stage.
While liver biopsies are currently the most commonly used test for the diagnosis of HBV-related fibrosis in children, its invasiveness limits its use in repeat assessments which are required for the dynamic monitoring of CHB development and the effects of antiviral treatment [8, 9]. Recently, a pediatric nonalcoholic steatohepatitis study reported TE AUCs of 0.992 and 1 for fibrosis stages F ≥ 2 and F ≥ 3, respectively; cut-off values for predicting the corresponding fibrosis stages were 7 kPa and 9 kPa, respectively [14]. Another study found that the 8.6 kPa cutoff point could be used to discriminate between stages F0–F2 and F3–F4 in children and young adults with multiple causes of liver disease [11]. In our study, we found that the AUCs were 0.732 and 0.941, and the cut-off values were 5.6 kPa and 6.9 kPa for fibrosis stages F ≥ 2 and F ≥ 3, respectively. The discrepancies between the findings of these studies may be due to differences in the age of the participants at the time of enrolment, as well as the causes of liver disease [19]. Consistent with our findings, the study by Anna et al. reported LSM of 5.4 (95% CI 4.0, 7.1) kPa for the F2 stage in children with CHC [20]. Moreover, a previous study demonstrated that the LSM was able to adequately predict the liver fibrosis stage in adult patients with CHB. The ROC curves were 0.81 for F0–F1 vs. F2–F4, and 0.93 for F0–F2 vs. F3–F4 [21], which are consistent with the results for children with CHB in our study. However, the cut-off values in adult patients with CHB were 7.2 kPa and 8.1 kPa for fibrosis stages F ≥ 2 and F ≥ 3, respectively [21]; this difference of the cut-off values between young children in our study and adult patients was also affected by subject age. Overall, the present study is the first to suggest that TE is a highly effective methodology for identifying advanced fibrosis (F ≥ 3) in children (aged 0–6 years) with CHB. Moreover, TE is vital for outpatient monitoring and clinical decision-making for children with CHB and advanced fibrosis, similarly to adults [22].
We additionally found that the APRI and FIB-4 did not provide additional advantages over the LSM for the discrimination of hepatic fibrosis stages F ≥ 2 and F ≥ 3. In agreement with some studies that have focused on adults with CHB [23, 24], we found that the APRI and FIB-4 were not suitable for predicting HBV-related fibrosis stages of F ≥ 2 and F ≥ 3 in CHB children. These results suggest that TE, APRI, and FIB-4 are suboptimal for the diagnosis of the F ≥ 2 stage. Previous studies have reported correlations between HBV/HCV-related fibrosis and the following factors: PLT count, log10HBsAg, alkaline phosphatase, ALT, AST, BMI, and inflammation [25,26,27]. Similarly, in our study, we found that LSM, PLT, and Log10HBsAg were independent factors associated with the F ≥ 2 fibrosis stage. This study is the first to combine these three independent factors to generate a “LPS” index and demonstrate an improvement in diagnostic accuracy for the F ≥ 2 fibrosis stage.
This study had several limitations. First, due to the low incidence of HBV-related advanced fibrosis in children, the number of patients with the F3–F4 fibrosis stage was small; this limited our ability to validate the cutoff points for identifying advanced fibrosis. Second, we only evaluated children aged 0–6 years, and our study was performed at a single center. Future studies should utilize larger sample sizes across multiple centers, to validate the cutoff points determined in this study. Furthermore, the performance of TE in the 7- to 18-year-old age group warrants consideration.
In conclusion, the LSM is a superior noninvasive index for the detection of LSM rather than APRI and FIB-4 offer excellent performance for children aged 0–6 years with HBV-related advanced fibrosis, compared to the APRI and FIB-4, in children aged 0–6 years in China. However, TE, APRI, and FIB-4 are suboptimal for the diagnosis of the F ≥ 2 fibrosis stage. The diagnosis of this stage can be significantly enhanced by the combination of LSM, PLT, and log10 HBsAg.
Abbreviations
- AUC:
-
Area under receiver operating characteristics (ROC) curves
- ALT:
-
Alanine aminotransferase
- AST:
-
Aspartate aminotransferase
- ALP:
-
Alkaline phosphatase
- APRI:
-
Aspartate aminotransferase (AST)-platelet ratio index (APRI)
- HBeAg:
-
Hepatitis B e-antigen
- BMI:
-
Body Mass Index
- HBsAg:
-
Hepatitis B surface antigen
- CHB:
-
Chronic hepatitis B
- COI:
-
Cut off index
- CHC:
-
Chronic hepatitis C
- FIB-4:
-
Fibrosis-4 index
- IQR:
-
Interquartile range
- kPa:
-
Kilopascal
- LSM:
-
Liver stiffness measurement
- LPS index:
-
(LSM, PLT and Log10HBsAg) = 0.511 × LSM − 0.006 × PLT − 0.682 × Log10HBsAg + 0.769
- METAVIR:
-
Meta-analysis of histological data in viral hepatitis
- PLT:
-
Platelet
- PPV and NPV:
-
Positive and negative predictive values
- PLR and NLR:
-
Positive and negative likelihood ratio
- γ-GT:
-
Gamma-glutamyl transpeptidase
- TE:
-
Transient elastography
- WBC:
-
White blood cell
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Acknowledgement
We thank the staff from the Department of liver disease and Ming-yuan Ji from the National day school for assisting in data collection. We also thank all of the patients for their participation in this study.
Funding
Supported by the Innovation Groups of the National Natural Science Foundation of China (81721002), the National Key R&D Program of China (2017YFA0105703), the Capital Clinical Application Research Foundation (Z161100000516176), the Major National Science and Technology Project (2018ZX10301-404), and National Key R&D Program of China (2019YFC0840704).
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Zhiqiang Xu, Jinfang Zhao, Jiaye Liu, Yi Dong, Fuchuan Wang, Jianguo Yan, Lili Cao, Pu Wang, Aiqin Li, Jing Li, Shishu Zhu, Yanwei Zhong, Min Zhang, and Fu-Sheng Wang have no conflicts of interest to disclose.
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This study was approved by the ethics committees of our hospital (NO. 2015151D) and fully complied with the Declaration of Helsinki and the Guideline for Good Clinical Practice. This article does not contain any studies with animals performed by any of the authors.
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Xu, Z., Zhao, J., Liu, J. et al. Assessment of liver fibrosis by transient elastography in young children with chronic hepatitis B virus infection. Hepatol Int 15, 602–610 (2021). https://doi.org/10.1007/s12072-021-10194-7
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DOI: https://doi.org/10.1007/s12072-021-10194-7