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Research Article: Systematic Review and Meta-Analysis

Efficacy and safety of compound Kushen injection combined with chemotherapy on postoperative Patients with breast cancer

A meta-analysis of randomized controlled trials

Ao, Man MMa; Xiao, Xu MMb; Li, Qingshan MMa,∗

Editor(s): Wang., Lu

Author Information
doi: 10.1097/MD.0000000000014024
  • Open

Abstract

1 Introduction

Breast cancer is the most common malignancy among the women worldwide. According to data released by International Agency for Research on Cancer (IARC), in the year of 2008, the number of new cases of female breast cancer has been up to 1,380,000, accounting for 22.9% that of overall cases of female malignant tumor; 460,000 women died at breast cancer, accounting for 1.37% of overall death for malignant tumor among women, and 1.7% of overall death among women. In China, the number of new cases of female breast cancer annually is about 169,000. Breast cancer is the 2nd most common malignant tumor among the Chinese women. It causes 45,000 deaths annually and is ranked the 6th as the most common causes of death among various malignant tumors. In comparison with other countries in the world, incidence and mortality of breast cancer among Chinese women is low. According to estimation of IARC, standardized incidence of breast cancer in Chinese women in 2008 was 21.6/100,000, ranked 99th among 184 countries with statistics globally; the standardized mortality is 5.7/100,000, ranked 145th. Both rates were significantly lower than the world average. However, due to the large population base of China, the annual new cases of breast cancer in China, which was 169,000 cases, accounting for 12.25% that of overall new cases, ranked 2nd in the world. Furthermore, incidence and mortality of breast cancer in China are rising rapidly, that the standardized incidence grew 4.0 to 7.3 times higher, from the year of 1988 to 2007. The standardized mortality had increased from 3.74/100,000 to 5.09/100,000 during the period from 1970 to 2004 or 2005.[1,2] Therefore, breast cancer has been a serious burden for societies of China and the whole world. Seeking for effective and safe treatment strategies for breast cancer is an urgent task for medical researchers.

Integrated traditional Chinese and western medicine therapy have been the distinctive methods of Chinese people in malignant tumors treatment. Traditional Chinese medicine (TCM) in combination with chemotherapy can enhance the efficacy and reduce chemotherapy-induced toxicity in treatment of various kinds of carcinoma.[3,4] The common TCMs widely applied for breast cancer treatment include compound Kushen injection (CKI). The CKI is extracted from 2 medical herbs, Radix Sophorae Flavescentis and Rhizoma Smilacis Glabrae.[5] It is adetailed-recorded in Shen Nong Ben Cao Jing, a famous ancient Chinese medicine book, indicated for cancerous pain and blooding.[6] It has a long history of use for the treatment of solid tumors, inflammation, and other disease.[6] In modern clinical practice, it has also been widely used as adjuvant therapy to treat breast cancer and other various carcinoma such as nonsmall-cell lung cancer, primary liver cancer, digestion cancer, etc,[7] and indicated various pharmacologic actions including pain relief, ensuring hemostasis, anti-inflammatory activity, and anti-fibrosis.[8]

A large number of clinical trials evaluating the clinical benefit of combination of Kushen and chemotherapy or radiotherapy among patients with breast cancer or other tumors had been carried out in China. However, for many reasons, most of those randomized controlled trials (RCTs) have not been registered with relatively low quality and the results were generally published in Chinese journals. This situation was not good for application and further study of Kushen injection in anti-tumor treatment. In recent years, accompanying more and more attention paid to Kushen adjuvant effect on cancer patients, a few registered RCTs with high quality have been carried out in recent years.[9,10] In addition, a few meta-analysis upon efficacy and safety of Kushen injection as adjuvant therapy in cancer patients have been published in international journals.[11,12] These provided more reliable and systematic evidence for clinical benefit of Kushen on tumor treatment. However, there is no meta-analysis upon use of CKI for breast cancer published in international journals yet; therefore, we conducted systematic analysis on relative studies, aiming to provide guidance for clinical application and future research of Kushen combined with chemotherapy in breast cancer treatment.

2 Methods

2.1 Inclusion and exclusion criteria

The studies included in the present meta-analysis must meet the following criteria:

  • 1. Types of studies: RCT.
  • 2. Types of participants: breast cancer patients who had received radical or modified radical mastectomy or breast-conserving surgery in 3 months before receiving intervention drugs. Diagnosis for all patients conforms to “guidelines and standard for diagnosis and treatment of breast cancer of Chinese Anti-cancer Association”; patients who have serious liver and kidney dysfunction, or concurrent infection, or Karnofskyg scores <70, or are intolerable to experimental drugs are excluded.
  • 3. Types of interventions: after surgery, patients in the controlled group were given the regular chemotherapy treatment; patients in the experimental group were given the same type of chemotherapy plus CKI.
  • 4. Types of outcome measures: primary outcomes were response rate and performance status improvement rate; secondary outcomes were adverse drug reaction (ADR) rate and tumor marker decreasing rate. Response rate (%) = number of complete response rate patients + number of partial response rate /total patients number × 100%. Efficacy assessment follows RECIST standard. Complete response: complete disappearance of the tumor in response to treatment. Partial response: The shrinkage of tumor size ≥50%. Stable disease (SD): Tumor sizes do not appear to change. Progressive disease: tumor size increase and the disease is progressing or worsening. Performance status was assessed by the Karnofsky performance score. KPSS increase ≥10 points was considered improvement of performance status. KPSS decrease ≥10 points was considered lower performance status. KPSS increase or decrease <10 points was considered stable performance status. The ADR assessment met the common toxicity criteria of chemotherapy drugs drafted by WHO (1991). Assessed ADRs include liver function impairment, kidney function impairment, leukocyte level decrease, diarrhea, nausea and vomiting, hair loss, platelet decrease, and oral mucositis.

Tumor marker level increasing from normal range to abnormal range, or increasing 25% was considered tumor marker increasing. Tumor marker level decreasing from abnormal range to normal range, or decreasing 25% was considered tumor marker decreasing. Tumor marker level increasing or decreasing <50%, and staying in 1 range without crossing over, was considered stable. Tumor marker decrease rate = number of patients with decreased tumor marker/total patients number.

2.2 Literature search

The following databases were searched for relevant RCTs dated from the year of 2000 to July 2017: PubMed, Cochrane library, Embase, and 4 Chinese medical databases: CNKI, CBM, VIP, and Wan-Fang Database. Retrieval terms include “Matrine Injection,” “Breast Cancer,” “Kushen injection,” “Yan Shu Injection,” and “chemotherapy.” References of important articles retrieved were manually searched.

2.3 Data extraction and quality assessment

Two researchers screened the articles of RCTs respectively and extracted the data with uniform standardized table. They independently examined the title and abstract of the articles to make the preliminary screening to exclude the studies that do not meet criteria. They continued to review the main text. When there existed disagreement, they discussed with a 3rd independent medical expert to resolve it.

The researchers referred to the Cochrane handbook for systematic reviews of interventions, and made bias risk assessment for the included RCTs with Cochrane risk of bias tool. The following measurements were assessed: random sequence generation, allocation concealment, blinding of participants and personnel, blinding of outcome assessment, incomplete outcome data, selective reporting. Each measurement was categorized into 3 grades, low bias risk, unclear bias risk, and high bias risk.

2.4 Statistical analysis

Relative risk (RR) for response rate, performance status improvement rate, different types of ADRs, and tumor markers decreasing rate were calculated and compared between the 2 groups: chemotherapy treatment plus Kushen injection or chemotherapy alone. P-value <.05 was considered to be significant in statistical test. In the test of statistical heterogeneity among the different trials, the standard Chi-squared (I2Q) test was applied, and P < .01 indicated heterogeneity existed between studies. The fixed-effect and random-effects models generated similar results and same conclusions, but we used a random-effects model with Mantel–Haenszel statistics to generate the statistical estimates of effect, because some researchers suggested that the random-effects model is a better choice than the fixed-effect model when making medical decision.[13,14] All confidence interval (CI) had 2-sided probability coverage of 95%. Publication bias estimation was conducted using the funnel plot. All calculation was conducted using the Review Manager 5.3 software downloaded from the website of Cochrane community (http://community.cochrane.org/tools/review-production-tools/revman-5/revman-5-download).

3 Results

3.1 Literature search and characteristics of included RCTs

A total of 136 articles were identified in retrieval. Reviewers excluded 104 articles in preliminary screening. The remaining 32 articles were reviewed by main text. Afterward, 16 articles were excluded, for the following reasons: in 5 studies, intervention after surgery include other intervention, such as radiotherapy and transarterial chemoembolization; in 4 studies, the interval between surgery and experimental drug intervention was unclear; 2 studies have not included the measurements we analyze; the measurements of 5 studies were not suitable for calculation of overall effect. Finally, 16 studies in total were included in the analysis (Fig. 1). The total number of patients included was 1315, in which experimental group included 660 patients and control group included 655 patients.

Figure 1
Figure 1:
Randomized controlled trials screening process.

All included RCTs were carried out in China between the year 2009 and 2017, performed in single center and published in Chinese journals. Details of the individual studies are as described in Table 1. The chemotherapy varied among the studies, but all were regular regimen. The doses of administered Kushen injection ranged from 12 to 30 mL. Six studies had reported clinical response rate (CRR, short term).[19,21,23,24,29,30] Eight studies reported performance status improvement by KPSS,[16,19,21–23,25,28,31] in which 4 studies adopted measurement of performance status improvement rate,[16,19,25,28] the other 4 adopted average KPSS.[21–23,31] Three studies compared the tumor marker CEA and CA15-3 decrease rate between the 2 intervention groups.[16,25,32]

Table 1
Table 1:
The basic characteristics of the included studies.

3.2 Quality assessment

All studies were RCTs and it was reported that there was no significant difference between 2 intervention groups in respect to the age, diagnosis, stage, performance status, etc, in all studies. However, the randomization generation methods were not well described. Blindness had not been adopted in all studies. Most of the studies did not include follow-up period. Only two studies had mentioned follow-up.[17,32] One study reported 3 death due to primary breast cancer during follow-up,[17] and 1 study reported 1 drop-out due to drug allergy.[16] Based on Cochrane risk of bias tool, all the included studies were rated as studies with high bias risk (Table 2).

Table 2
Table 2:
Quality assessment of included randomized controlled trials.

4 Outcomes

4.1 The clinical response

In this analysis, we had pooled the data of 6 studies and made heterogeneity test. P = .02 (>.01) indicated no significant difference between the included studies. The result of pooled RR calculation indicated that there was no significant difference in respect to CRR between the 2 intervention groups (RR 1.07, 95% CI 0.78–1.47, P = .66) (Fig. 2).

Figure 2
Figure 2:
Forest plot of clinical response rate in patients treated with Kushen injection plus chemotherapy and chemotherapy alone.

4.2 Performance status improvement

Four studies reported performance status improvement rate had been included in the analysis. Due to statistical calculation limitation, the 4 studies compared average KPSS cannot be included as well. In heterogeneity test, P = .31, I2 = 17%, which indicated small heterogeneity between the studies. Random-effects model was still adopted due to the reasons mentioned in former part. The pooled RR calculation indicated that the Kushen injection combined with chemotherapy can significantly increase performance status improvement rate compared with chemotherapy alone (RR 1.25, 95% CI 1.09–1.42, P < .0001) (Fig. 3).

Figure 3
Figure 3:
Forest plot of performance status improvement rate in patients treated with Kushen injection plus chemotherapy and chemotherapy alone.

4.3 Adverse reactions

We calculated pooled RR for liver dysfunction, kidney dysfunction, leukocyte decrease, nausea and vomiting, diarrhea, hair loss, platelet decrease, and oral mucositis. The results are summarized in Table 3. Except for the analysis of leukocyte decreased (P = .008, I2 = 68%), the rest of the analysis all demonstrated small heterogeneity. P-values obtained in these analyses all demonstrated statistical significance between the 2 intervention groups. These results suggested Kushen injection combined with chemotherapy might significantly decrease the ADRs of liver dysfunction, kidney dysfunction, nausea and vomiting, diarrhea, hair loss, platelet decrease, and oral mucositis.

Table 3
Table 3:
Comparison of ADEs among patients treated with Kushen injection + chemotherapy and chemotherapy alone.

4.4 Tumor marker decrease

The forest plot information for meta-analysis of tumor marker decrease is summarized in Table 4. The pooled estimates demonstrated that there was no significant difference in 2 tumor marker decrease rates between the 2 interventions (CEA: RR 1.45, 95% CI 0.99–2.12, P = .06; CA15-3: RR 1.68, 95% CI 1.00–2.83, P = .08). However, significant heterogeneity exists between included studies (CEA: P = .01, I2 = 76%; CA15-3: P = .0006; I2 = 87%). Therefore, we conducted sensitivity analysis. When we remove the trial conducted by Zhijun[25] in both analysis of CEA and CA15-3, the pooled result changed slightly (CEA: RR 1.45, 95% CI 0.99–2.12), P = .32; CA15-3: RR 1.24, 95% CI 1.06–1.45), P = 0.008), but there existed no heterogeneity between the remaining studies.

Table 4
Table 4:
Comparison of tumor marker decrease rate for patients treated with Kushen injection + chemotherapy and chemotherapy alone.

4.5 Publication bias

A funnel plot was adopted to analyze the publication bias. The 6 studies were included in the meta-analysis for clinical response[19,21,23,24,29,30] (Fig. 4). The asymmetry seems not significant, which indicated the publication bias is not obvious, thus its influence on pooled effect can be ignored. On the contrary, the analysis of performance status improvement had included only four studies, therefore its funnel plot had not been performed.

Figure 4
Figure 4:
Funnel plot of clinical response for the publication bias.

5 Discussion

According to analysis result, Kushen injection combined with chemotherapy is not superior to chemotherapy alone among postoperative patients with breast cancer in respect to response rate. The response rate analysis had included 6 studies. In the forest plot, the 95% CI horizontal line of risk ratio of only 1 study dropped to be living with the invalid upright string right side completely, which indicated this study support the superiority of combination of Kushen injection and chemotherapy over chemotherapy alone in respect to response rate. However, the rest 5 studies and the result of overall effect demonstrated that Kushen injection combined with chemotherapy did not improve response rate significantly compared with chemotherapy alone.

In the analysis of performance status improvement, Kushen injection combined with chemotherapy seems to be superior to chemotherapy alone. Among the 4 studies included, 95% CI horizontal lines of risk ratio of 3 studies are completely living on the right side of the invalid upright string, so does that of the overall effect, which indicated the superiority of combination therapy. This analysis included only 4 studies, which had reported performance status improvement rate. Other 4 studies had also reported effect of experimental drug on performance status, but the measurements are average KPSS before and after treatment, which cannot be included for analysis for overall effect; otherwise more studies could be included in the analysis and analysis conclusion could be more convincing and reliable.

As to the analysis of tumor marker decrease rate, it was indicated Kushen combined with chemotherapy did not significantly change the tumor marker decrease rate.

According to the analysis result of ADRs, Kushen injection combined with chemotherapy had significantly decreased the rate of liver dysfunction, kidney dysfunction, nausea and vomiting, diarrhea, hair loss, platelet decrease, and oral mucositis, which suggested that Kushen injection might ease the toxic reaction induced by chemotherapy.

It was widely accepted that in solid tumor treatment, therapy for 1 target is not adequate to suppress the progression of tumor. Clinical studies had shown that multi-target suppression is superior on anti-tumor effect to that of single-target therapy. Multi-target therapy might decrease toxicity and prevent drug resistance induced by single target therapy. Multi-target suppression has been the future direction of tumor treatment.[32] Traditional herbal medicine is usually from natural origin, containing multiple components. These features make them natural and good candidate for cancer treatment. In clinical practice, TCM combined with chemotherapy or radiotherapy has shown to protect patients from impairment induced by chemotherapy or radiotherapy, decreased the ADRs, and even improve anti-tumor efficacy.[33] Inclusion of TCM in research upon anti-tumor would be promising and beneficial.

Kushen had been applied in tumor treatment for a long time in China. In Chinese traditional medicine, it is recorded that Kushen had the effects of heat clearing and damp inhibiting, blood cooling and toxin relieving, stagnation eliminating, and pain relieving.[34] Modern scientific studies had explored the mechanism of anti-tumor activity of Kushen. In vitro, CKI suppressed tumor cell growth by inducing apoptosis[35] and inhibits the migration, invasion and adhesion capacity by downregulating the expression of CD44v6 protein.[36] As one of the major alkaloids of CKI, Kushen has been well documented to have anti-tumor effects in different cancer cells, including breast cancer cell lines (MCF-7), gastric cancer cells (SGC-7901 and MKN45), gallbladder carcinoma cells (GBCSD), osteosarcoma tumor cells (UMR-108), and liver cancer cells (HepG2).[37,38] Specifically, Kushen effect on breast cancer has also been explored. In mice, Kushen injection can suppress human breast cancer stem-like cells by downregulating the canonical Wnt/β-catenin pathway.[39] In vitro, Kushen injection inhibited proliferation of MCF-7 human breast cancer cell line by breaking the cell cycle, and induced apoptosis in a dose-dependent fashion.[40] Moreover, its effect of analgesic, haemostatic, anti-stress, anti-inflammation, and immune function improvement had been proven in vitro.[8] In the clinical trials for Kushen combined with chemotherapy upon breast cancer, almost all evidenced Kushen as adjuvant therapy can improve life quality, decrease ADRs and improve immune function (not analyzed in the present meta-analysis). In the present meta-analysis, overall effect demonstrated that Kushen injection can improve life quality and decrease ADRs. These positive results encouraged us to make further exploration and investigation toward Kushen injection in tumor treatment, such that it can be more widely recognized and applied.

This meta-analysis is the 1st one of CKI combined with chemotherapy on breast cancer patients published in international journals. There are 2 meta-analysis in the same topics were published in Chinese journals[41,42] in the year of 2012. The present meta-analysis had updated the trials and reviewers had strictly followed the inclusion and exclusion criteria.

The limitations of the study are as follows: Up to date, none of the trials investigating Kushen combined chemotherapy on breast cancer patients had registered. All of the trials have not been rigorously designed and are methodologically inadequate. Randomization and allocation was only mentioned, but details have not been described. Blinding was carried out in none of the trials. In the quality assessment, the trials included are all rated as studies with high bias risk and low quality. Those disadvantages will decrease the reliability of the collected data and even the conclusion. However, the consistency of the published results is fairly good, so the conclusion of the present met-analysis shall be still reliable. All the studies were carried out in China, and published in Chinese journals, which might lead to limited generalization of analysis conclusion, and on the contrary, publication bias. However, according to funnel plot, the publication bias in the analysis of clinical response was not obvious. There is lack of uniform standard for measurements. Some measurements in trials are not suitable for meta-analysis, therefore a few trials or some certain measurements in trials cannot be included in the analysis. For example, many studies had reported the positive effect of Kushen combined with chemotherapy on immune function, which was measured with average immunoglobulin level or T-cell subset level. Due to limitation of statistical analysis, we cannot make overall effect with these measurements. In fact, immune functions improvement is an important measurement in breast cancer treatment, and distinct clinical benefit of Kushen injection. The individual studies all focus on the short-term clinical benefit and did not measure the long-term effect. Measurements such as PFS, OS, and TTP are important measurements physicians will take into account.

In conclusion, the present meta-analysis supported that CKI combined with chemotherapy might improve performance status and decrease rate of ADRs compared with chemotherapy alone, but might not improve CRR. However, we still need more RCTs with good designing, rigorous execution, multi-centers, large sample, and long-enough follow-up period to further validate the clinical effect of Kushen as adjuvant therapy among patients with breast cancer.

Author contributions

Conceptualization: Man Ao.

Data curation: Xu Xiao.

Formal analysis: Xu Xiao, Qingshan Li.

Investigation: Xu Xiao.

Supervision: Man Ao.

Validation: Man Ao.

Visualization: Man Ao.

Writing – original draft: Man Ao.

Writing – review & editing: Qingshan Li.

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            Keywords:

            breast cancer; chemotherapy; compound Kushen injection; meta-analysis

            Copyright © 2019 the Author(s). Published by Wolters Kluwer Health, Inc.