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Therapeutic Efficacy and Safety of Paeoniae Radix Rubra Formulae in Relieving Hyperbilirubinemia Induced by Viral Hepatitis: A Meta-Analysis

Objective: Hyperbilirubinemia is one of the most devastating pathologies induced by various liver diseases. Formulae related to Paeoniae Radix Rubra (PRR) at high doses have been applied to treat hyperbilirubinemia in traditional Chinese medicine (TCM). The aim of this systematic review and meta-analysis is to assess the efficacy and safety of formulae relevant to high-dose PRR in patients suffering from hyperbilirubinemia induced by viral hepatitis. Methods: We performed a meta-analysis of randomized-controlled clinical trials to evaluate the efficacy and safety of formulae that apply a high dose of PRR for hyperbilirubinemia. Seven databases were searched until April, 2015. All studies were included according to detailed criteria and assessed for methodological quality. The outcome measurements were recorded for further analysis using the RevMan 5.2.11 software. Results: Fifteen articles involving 1323 patients with hyperbilirubinemia were included. Formulae with high-dose PRR might promote the efficacy of either a combined application ([OR: 3.98, 95% CI (2.91, 5.43)]; P < 0.01) or a single application ([OR: 4.00, 95% CI (1.50, 10.68)]; P < 0.01) for hyperbilirubinemia. The indices of TBIL, ALT, and AST significantly decreased ([MD: –75.57, 95% CI (−94.88, −56.26)], [MD: −26.54, 95% CI (−36.19, −16.88)], and ([MD: −28.94, 95% CI (−46.26, −11.61)]; P < 0.01), respectively. In addition, formulae with high-dose PRR could enhance the treatment efficacy of hyperbilirubinemia triggered by hepatitis B ([OR: 2.98, 95% CI (1.75, 5.05)]; P < 0.01). Furthermore, the efficacy was enhanced with an increasing dosage of PRR. Two articles reported that no side effects occurred in clinical trials, and three studies noted that patients presented light digestive tract symptoms. Conclusion: Formulae relevant to high-dose PRR ameliorate hyperbilirubinemia and might constitute a promising therapeutic approach. For widespread acceptance by practitioners, more rigorously designed multicenter, double-blind, randomized, and large-scale controlled trials are required.


INTRODUCTION
Hyperbilirubinemia presenting high serum bilirubin or severe jaundice is one of the most devastating pathologies in patients with various liver diseases (Duan et al., 2006). Continuous hyperbilirubinemia without proper treatment commonly leads to hepatocyte edema, necrosis, inflammation, and even liver cirrhosis, which can directly threaten quality of life (Garg et al., 2011). Current therapies for hyperbilirubinemia mainly focus on a combination of decreasing serum bilirubin, liver protection, regulating transaminase levels, and nutrition support. However, there are unstable curative rates as well as side effects in the clinic. Ursodeoxycholic acid (UDCA) and Ademetionine are the firstline drugs used to decrease serum bilirubin. The inconsistent efficiency and expensive medical costs are common obstacles for some patients (Hou et al., 2010). Potassium magnesium aspartate as an adjuvant is limited by its efficacy in decreasing serum bilirubin. In addition, glucocorticosteroid therapy, due to side effects and the possibility of symptom rebound, is controversial, particularly when treating hyperbilirubinemia for a long duration (Zhang and Shen, 2011).
Growing evidence indicates that traditional Chinese medicine (TCM), as a complementary and alternative therapy, has an important role in hyperbilirubinemia or jaundice treatment (Li et al., 2008). The decoctions of Yin Chen Hao, Yin Chen Si Ni, Da Huang Xiao Shi, Zhi Zi Bai Pi, and Chi Dan Tui Huang have been proven to effectively decrease serum bilirubin and protect hepatocytes (He et al., 2003;Zhou, 2010). In particular, several formulae that reverse blood stasis are commonly applied in hyperbilirubinemia. Paeoniae Radix Rubra (PRR, Chishao in Chinese), the dried root of Paeonia lactiflora Pall, has been used for thousands of years in TCM to treat blood stasis. A series of PRR-relevant formulae, due to their significant function as blood invigorators, have been used as treatments for jaundice for decades and have obtained satisfactory efficacy . Currently, these formulae have been reported as promising therapies in the clinic and are widely used in China. However, a systematic review on formulae relevant to high-dose PRR for treating hyperbilirubinemia has not been reported. Therefore, this meta-analysis of randomized controlled trials (RCTs) was conducted to assess the clinical value of formulae relevant to high-dose PRR in treating hyperbilirubinemia and to provide a possible complementary and alternative therapy for widespread use by practitioners (Figure 1).

Exclusion Criteria
Studies with the following criteria were excluded: (1) reviews, non-clinical studies, and case observations, (2) the absence of Randomized controlled trials (RCTs), or (3) interventions with another TCM formulae (not including extracted agents) or acupuncture therapies in the control group.

Inclusion Criteria
According to the advice of a liver specialist, the inclusion criteria were designed as follows: (1) RCTs with patients diagnosed as having hyperbilirubinemia by meeting the criteria of Viral Hepatitis Prevention and Treatment Programs (VHPTP) version 2010, 2005, 2000, 1995, or 1990. (2) Studies must have claimed that patients developed hyperbilirubinemia due to viral hepatitis. In addition, participant serum TBIL was above 171 µmol/L before treatment.
(3) PRR served as the main component in the formulae and the high dosage was defined as >25 g (two times higher than the prescribed maximum dose of Chinese Pharmacopeia 2010 version). (4) High-dose PRRrelevant formulae alone or as a combined application served as the trial group. Placebo or conventional therapy served as the control group. (5) Outcome measurements must have included one or more of the following indices: total effective rate, alanine aminotransferase (ALT), aspartate aminotransferase (AST), total bilirubin (TBIL), direct bilirubin (DBIL), γ-glutamyl transferase (γ-GT), albumin (ALB), and prothrombin time (PT). (6) The total efficacy was coincident with the Guidance for Clinical Research on New Drugs of TCM, i.e., recovery as evidenced by the absence of symptoms and TBIL decreasing to nearly normal levels. Effectiveness was identified by ameliorated symptoms and TBIL decreasing below half of the original value (85.5 µmol/L). Invalidation was defined as symptoms and TBIL remaining unchanged or worsening.

Data Extraction and Risk of Bias Assessment
Data extraction and quality assessment were independently performed by two researchers, and disagreements were resolved by consensus. Detailed data such as study design, participants' information, interventions, outcome measures, and adverse events were extracted to a conclusive table.
The Cochrane risk of bias tool was used to access the methodological quality of the included RCTs. There were six domains, including random sequence generation (selection bias), allocation concealment (selection bias), blinding of participants and personnel (performance bias), blinding of outcome data FIGURE 1 | Study flow of Paeoniae Radix Rubra in hyperbilirubinemia. It demonstrated that PRR has been used for the treatment of blood stasis for hundreds of years, as evidenced by records from Ben Cao Gang Mu in 1578 (Ming dynasty). This study was performed to assess the clinical value of high-dose PRR-relevant formulae in the treatment of hyperbilirubinemia.

Data Analysis
Statistical analysis was performed using Cochrane RevMan 5.2.11 (Cochrane Collaboration). Dichotomous data were presented as the odds ratio (OR) and continuous variables as the mean difference (MD) with 95% confidence intervals (95% CI). Statistical heterogeneity was assessed by Cochrane's Q-test. Data with low heterogeneity (P ≥ 0.10 and I 2 ≤ 50%) were analyzed by a fixed-effects model, whereas a random-effect model was used for data with high heterogeneity. A funnel plot was used to assess potential publication bias.

Characteristics of the Included Studies
A total of 4300 publications from 7 databases were identified for the initial screen. We removed 1278 duplicated citations, and 2780 were excluded due to irrelevance. The full texts of 242 articles were retrieved for detailed assessment. Of the remaining articles, there were 57 non-randomized controlled studies, 6 animal studies, 97 inconsistent criteria, 40 ineligible PRR doses in the formulae or no mention of dosage, 14 with no PRR in the formulae, 8 summaries, and 5 review articles. Fifteen studies were ultimately used for further meta-analysis (Figure 2).
Fifteen articles involving 1323 subjects with hyperbilirubinemia (729 cases in the trial group, 594 cases in the control group) were included in this study. Because most of the formulae-form therapy was applied in TCM, the 15 studies that had been screened were all published in Chinese. There was no significance in terms of age and sex between these two groups ( Table 1). Formulae with high-dose PRR with essential treatment or as a single application were used in the trial group, whereas essential treatment was applied in the control group in all studies. The dose of PRR in the formulae ranged from 30 to 200 g. The treatment duration described in the articles ranged from 2 weeks to 60 days, and 5 articles (Li and Gu, 1994;Xu et al., 1999;Wang et al., 2003;Lou et al., 2007;Bo, 2008) reported adverse events and side effects. No trial reported a follow-up ( Table 2).

Methodological Quality of Included Trials
The methodological quality of the 15 included trials was generally low. According to the Cochrane risk of bias estimation, a randomized allocation of participants was mentioned in all trials. However, only 2 trials (Huang and Yang, 2005;Zhang, 2009) mentioned an appropriate randomized method. Allocation concealment, blinding of participants and blinding of outcome assessment were not recorded in the 15 studies. Six of the 15 articles (Feng et al., 2006;Lou et al., 2007;Luo, 2007;Shi et al., 2009;Zhang, 2009;He, 2010) were at low risk of incomplete outcome data or essential data missing. Selective reporting was generally unclear. Only four articles (Li and Gu, 1994;Wang et al., 2003;Luo, 2007;Bo, 2008) reported research protocols, and the result of the detailed indices indicated a low risk of selective reporting. (Figure 3).

Outcome Measures with Subgroup Analysis
Efficacy Rate of High-Dose PRR-Relevant Formulae Combined with Essential Treatment or Single Application vs. Essential Treatment Thirteen of the 15 articles described the application of formulae on high-dose PRR combined with essential treatment as the trial group. The remaining 2 RCTs (Liu, 2000;Shi et al., 2009) reported a single application of high-dose PRR formulae in the trial group. No heterogeneity was found in both analyses and a fixed effects model was used (P > 0.10). The results displayed as OR with 95% CI in the combination treatment and single application were [OR: 3.98, 95% CI (2.91, 5.43)] and [OR: 4.00, 95% CI (1.50, 10.68)], respectively. This revealed that formulae of high-dose PRR might promote the treatment efficacy for hyperbilirubinemia (P < 0.01; Figure 4).

Hyperbilirubinemia Indices of High-Dose PRR-Relevant Formulae vs. Essential Treatment
The serum TBIL level, which is the direct and crucial index of hyperbilirubinemia, was described in 12 trials. In addition, 3 studies (Huang and Yang, 2005;Lou et al., 2007;Zhang, 2009) reported the serum DBIL level. The serum ALT level was measured in 11 articles, and five studies (Huang and Yang, 2005;Feng et al., 2006;Lou et al., 2007;Shi et al., 2009;Zhang, 2009) recorded the AST level. Serum ALB and γ-GT were reported in 4 (Kong et al., 2003;Wang et al., 2003;Luo, 2007;Bo, 2008) and two trials (Feng et al., 2006;Shi et al., 2009), respectively. Two trials (Kong et al., 2003;Wang et al., 2003) recorded the PT level. There was heterogeneity in the indices of TBIL, DBIL, ALT, AST, PT, and ALB (P < 0.10). Therefore, a random effects model was used for analysis. There was no heterogeneity (P > 0.10) in the index of γ-GT; the fixed-effect model was thus used. Hepatitis B virus is the most common and important cause of hyperbilirubinemia. In this study, the efficacy rate of formulae of high-dose PRR combined with essential treatment was specifically analyzed. There were five articles (Feng et al., 2006;Lou et al., 2007;Luo, 2007;Zhang, 2009;He, 2010) (Figure 8). T, trial group, C, control group. NR, no report.
Frontiers in Pharmacology | www.frontiersin.org FIGURE 2 | Flow diagram of the study selection process for the systematic review. As shown, our initial searches yielded 4300 records. The full texts of 242 articles were retrieved for detailed assessment after exclusion. Of these, 227 studies were subsequently excluded because they did not meet the inclusion criteria; 15 eligible studies were identified.

Efficacy Rate of Different Ranges of High-Dose PRR-Relevant Formulae Combined with Essential Treatment vs. Essential Treatment in Hyperbilirubinemia
Because there was a wide range of high-dose PRR from 30 to 200 g, a subgroup analysis of different ranges of formulae of high-dose PRR was needed. We classified these studies into three subgroups (PRR in 30-60 g, PRR in 60-120 g, and PRR greater than 120 g) according to the dose application. There were six studies (Kong et al., 2003;Huang and Yang, 2005;Feng et al., 2006;Lou et al., 2007;Bo, 2008;Zhang, 2009) ascribed to the 30-60 g subgroup and five studies (Li and Gu, 1994;Xu et al., 1999;Han et al., 2006;Luo, 2007;He, 2010) ascribed to the 60-120 g subgroup. In addition, the remaining 2 studies Zhu et al., 2006) were classified to the PRR greater than 120 g subgroup. On the basis of the fixed effect model (P > 0.10), the ORs with 95% CI of the three subgroups were [OR: 3.46, 95% CI (2.23, 5.37)] (PRR in 30-60 g), [OR: 3.76, 95% CI (2.12, 6.69)] (PRR in 60-120 g), and [OR: 6.15, 95% CI (3.03, 12.47)] (PRR more than 120 g), respectively. All three of the subgroups showed a significant increase in the efficacy rate of the trial group compared with the control group (P < 0.01). Furthermore, the efficacy was enhanced with an increasing dosage of PRR in relevant formulae (Figure 9).

Adverse Events
Among the 15 RCTs, two articles (Li and Gu, 1994;Bo, 2008) reported no side effects in clinical trials. Another three studies (Xu et al., 1999;Wang et al., 2003;Lou et al., 2007) observed side effects as light digestive tract symptoms in patients treated with formulae of high-dose PRR. However, the side effect did not influence the patients' efficacy or daily life. The remaining articles did not report whether there was a side effect. Despite the results suggesting that high-dose PRR is safe, more assessments on the safety of high-dose PRR are needed ( Table 2).

Publication Bias
A funnel plot was used to express the publication bias. The publication bias was explored when the indices or efficacy rate were above 9 cases. A funnel plot of the formulae of high-dose PRR combined with essential treatment vs. essential treatment was applied. Further, the indices of TBIL and ALT were also analyzed. The plots were symmetric, suggesting that there was no obvious publication bias (Figure 10).

DISCUSSION
As we mentioned, cholestatic hepatitis, and hyperbilirubinemia are both related to the dysfunction of bilirubin metabolism. However, there are several differences between cholestatic hepatitis. Cholestatic hepatitis is more concerned about the whole progression of the disease which could result in partial or complete blocking bile flow, high serum concentrations of bile acid, bilirubin, and liver injury. On the other side, hyperbilirubinemia could be widely expressed during the specific progression of various liver diseases and is more focused on the manifestation of high bilirubin. Moreover, the degree of bilirubin in hyperbilirubinemia is usually far more severe than in cholestatic hepatitis. In our former research, we have investigated the effect of high dose PRR relevant formulae on cholestatic hepatitis and found that this therapy could promote the efficacy (Ma et al., 2014). Therefore, according to the former result, we performed this meta-analysis on hyperbilirubinemia triggered by viral hepatitis. This systematic review included 15 RCTs; a total of 1323 participants with hyperbilirubinemia were screened from 4300 publications. All of the studies were based on highdose PRR (30-200 g) serving as the primary component of the formulae. The treatment duration described by the RCTs ranged from 2 weeks to 60 days, and five of the 15 studies reported side effects. According to the outcome, a single application or a combination of high-dose PRR formulae promoted efficacious hyperbilirubinemia treatment. The indices of hyperbilirubinemia also verified the result. TBIL is considered a direct index of hyperbilirubinemia. The serum TBIL level in 12 trials was analyzed by the random effects model. The MD with the 95% CI of the serum TBIL level was [MD: −75.57, 95% CI (−94.88, −56.26)] and indicated that formulae of high-dose PRR significantly decreased the serum TBIL level compared with FIGURE 3 | Methodological quality assessment for risk of bias for each included study. Risk of bias was used to assess the quality of RCTs, and the majority of studies were found to be of low quality.
FIGURE 4 | Forest plot of high-dose PRR-relevant formulae with essential treatment or single application vs. essential treatment in viral hepatitis patients with hyperbilirubinemia.
(1) Study item displayed as first author with the publication year.
(2) Subgroups were divided by formulae combined with essential treatment or single application.
(3) I-squared and P are the criterion of the heterogeneity test, pooled odds ratio, --odds ratio, and 95% confidence interval. essential treatment. Furthermore, the serum ALT and AST levels, which are sensitive indices of hepatic function, also decreased. However, there were no differences in DBIL, γ-GT, PT, and ALB between the groups. This suggested that formulae of highdose PRR might promote the regulation of the main indices of hyperbilirubinemia. Hepatitis B virus is the most common and important cause of hyperbilirubinemia. Therefore, the efficacy of high-dose PRR formulae on hyperbilirubinemia triggered by hepatitis B was specifically analyzed in this study. The result showed a significant increase in the efficacy rate in the trial group compared with the control group. This suggested that formulae of high-dose PRR might promote efficacious treatment of the hyperbilirubinemia caused by hepatitis B. Because there was a wide range of high-dose PRR, from 30 to 200 g, we performed an analysis on the efficacy rate of different ranges of high-dose PRR formulae. All three subgroups showed a significant increase in the efficacy rate of the trial group. Furthermore, the efficacy enhanced as the dosage of PRR in the relevant formulae was increasing. There were a few patients with light side effects of the digestive tract in the trial group. However, it did not influence the treatment progress and efficacy. A funnel plot was applied to assess the publication bias. The result indicated that little publication bias occurred in terms of efficacy and indices. This systematic review illustrates that formulae of high-dose PRR are safe to promote the efficacious treatment of hyperbilirubinemia. Hyperbilirubinemia, presenting with severe jaundice, is one of the most common manifestations in viral hepatitis patients. It usually leads to severe necrosis of hepatocytes over a chronic period (Wang, 2010). It is well-known that a variety of definite factors, including infection, drug abuse, autoimmunity, and heredity, are able to cause hyperbilirubinemia. As for the mechanism, researchers have mainly focused on disorders of bilirubin metabolism such as uptake, synthesis, and excretion (Nie, 2006). In detail, repeated inflammation in viral hepatitis always acts as the trigger of jaundice and ultimately results in hepatocyte damage and even necrosis. Once hepatocytes are  (3) I-squared and P are the criterion of the heterogeneity test, pooled mean difference, --mean difference, and 95% confidence interval. (3) I-squared and P are the criterion of the heterogeneity test, pooled odds ratio, --odds ratio, and 95% confidence interval. damaged, the metabolism of bilirubin is disturbed, thus causing bilirubin accumulation. If the high concentration of bilirubin fails to be eliminated, it accumulates such that hyperbilirubinemia or jaundice occurs. Moreover, a micro-imbalance would also occur in hepatocytes, such as inhibition of Na + -K + -ATPase, down regulation of NTCP and OATP expression, and deregulation of CAR and PXR expression. All of these consequences lead to bilirubin deposition in hepatocytes and jaundice and can cause worsening of hepatocyte damage (Paumgartner and Beuers, 2002;Wagner et al., 2011;Wlcek et al., 2013). According to the mechanism, hyperbilirubinemia is associated with various tissues and targets. Current western medical treatment for hyperbilirubinemia mainly focuses on the combination of alleviating jaundice, liver protection, lowering transaminase levels, nutrition support, etc. However, it lacks comprehensive adjustment and has unstable efficacy. In contrast, complementary and alternative medicine such as TCM for the treatment of hyperbilirubinemia often obtains positive results.
PRR has been widely used in TCM practice for thousands of years for the treatment of blood stasis by targeting the liver. Current studies indicate that PRR and its active components consistently exhibit wide pharmacological effects FIGURE 9 | Forest plot of the different ranges of high-dose PRR-relevant formulae combined with essential treatment vs. essential treatment alone. (1) Study item displayed as the first author with the publication year. (2) Subgroups were classified as PRR 30-60 g, PRR 60-120 g and PRR greater than 120 g. (3) I-squared and P are the criterion of the heterogeneity test, pooled odds ratio, --odds ratio, and 95% confidence interval. such as vasodilatation of the thoracic aorta (Jin et al., 2010), liver protection (Zhao et al., 2013), an anti-allergic effect (Lee et al., 2008), anti-inflammation, and immunoregulation (He and Dai, 2011). According to the TCM theory and modern pharmacology, the original clinical practice of formulae of high-dose PRR to treat hyperbilirubinemia has been gradually applied in recent years (Zhu, 2011). In addition, some studies may partially reveal the mechanism of this application. PRR is able to promote bile acid excretion, enhance the activity of UDPGT and decrease the TXB 2 level (Wang, 1986;Lei et al., 1988). In this aspect, PRR is effective in decreasing bilirubin. Although, there is efficacy on hyperbilirubinemia, it remains unclear why PRR should be used at such a high dose. Clinical studies have shown that there is a significant difference in efficacy between the high-dose treatment group (30 g) and the normal-dose treatment group (10 g). The efficacy of the highdose treatment group is markedly higher than the normal-dose treatment group in alleviating hyperbilirubinemia (P < 0.01) (Luo, 2007). This indicates that low-dose PRR cannot effectively treat hyperbilirubinemia compared with a high dose. This is likely related to the characteristic active compounds in PRR. Our previous study demonstrated that the bioavailability of paeoniflorin and albiflorin in PRR is extremely low (Jiang et al., 2012). Herein, a high dose of PRR shows stable treatment efficacy for the alleviation of hyperbilirubinemia, which was not found at low doses. According to these results, formulae of high-dose PRR might help uncover the crucial and specific function of this therapy for hyperbilirubinemia.
Currently, increasing attention has focused on TCM. Due to the holistic concept and treatment based on syndrome differentiation, TCM emphasizes formulae employment instead of a single drug application in treating diseases. Many studies demonstrate that formulae with favorable efficacy for specific diseases regulate body function in various organs and tissues in a network manner Li and Zhang, 2013). Therefore, further studies to illustrate the potential mechanism should be explored.

CONCLUSION
Formulae of high-dose PRR might safely promote the efficacious treatment of hyperbilirubinemia and are thus a promising treatment approach. For acceptance by widespread practitioners, more rigorously designed multicenter, doubleblind, randomized, and large-scale controlled trials are required for further investigation.

AUTHOR CONTRIBUTIONS
YH, XM, and JW analyzed the data and wrote the manuscript. YZ, ZC, and WZ collected and prepared samples. JW, JW, LS performed the analyses. YZ and XX designed the study and amended the paper.