Effect of Xuezhikang, an Extract From Red Yeast Chinese Rice, on Coronary Events in a Chinese Population With Previous Myocardial Infarction
Zongliang Lu, MD, PhDa, Wenrong Kou, MDa, Baomin Du, MDb, Yangfeng Wu, MDc,
Shuiping Zhao, MD, PhDd, Osvaldo A. Brusco, MDe, John M. Morgan, MDf, and
David M. Capuzzi, MD, PhDf,* on behalf of the Chinese Coronary Secondary
Results of well-controlled prospective clinical trials showed the efficacy of lipid-lowering therapies in the reduction of cardiovascular (CV) events in western populations, but they were not reported with a Chinese population. This multicenter study was conducted to determine the effects of Xuezhikang (XZK), a partially purified extract of red yeast rice, on lipoprotein and CV end points in Chinese patients who experienced a previous myocardial infarction. Nearly 5,000 of these patients with average low-density lipoprotein cholesterol levels at baseline were randomly assigned either to placebo or to XZK daily for an average of 4.5 years. The primary end point was a major coronary event that included nonfatal myocardial infarction and death from coronary heart disease. Frequencies of the primary end point were 10.4% in the placebo group and 5.7% in the XZK-treated group, with absolute and relative decreases of 4.7% and 45%, respectively. Treatment with XZK also significantly decreased CV and total mortality by 30% and 33%, the need for coronary revascularization by 1/3, and lowered total and low-density lipoprotein cholesterol and triglycerides, but raised high-density lipoprotein cholesterol levels. In conclusion, long-term therapy with XZK significantly decreased the recurrence of coronary events and the occurrence of new CV events and deaths, improved lipoprotein regulation, and was safe and well tolerated. 2008 Elsevier Inc. All rights reserved. (Am J Cardiol 2008;101: 1689 –1693)
Extracts of red yeast rice have been widely used for therapy
the reduction of recurrent cardiovascular (CV) events in a
of patients with circulatory disorders in China for centuries.
multicenter study of Chinese patients with average levels of
These extracts can decrease plasma lipids in animal models
low-density lipoprotein (LDL) cholesterol.
and have been used in several countries, including theUnited States. Lovastatin, the first statin drug approved by
Study medication, design, and patients:
regulatory authorities, was extracted from yeast rice. Xu-ezhikang (XZK), produced by the Beijing WBL Peking
The study medication consisted of 300-mg capsules of
University Biotech Co. Ltd (WPU) (Beijing, Peoples Re-
XZK, each containing the combination of lovastatin, also
public of China), is a partially purified extract of red yeast
termed monoclonin K (2.5 to 3.2 mg/capsule); a small
Chinese rice with multiple components. Results of smaller
quantity of lovastatin hydroxyl acid; as well as ergosterol
clinical trials indicated that red yeast rice preparation can
alter plasma lipoproteins The primary aim of
The study protocol was approved by the data and safety
this study was to evaluate the long-term efficacy of XZK in
monitoring and regional ethics committees of each studysite, and informed consent forms were signed by all enrolledpatients before study initiation. This randomized, double-
blind, placebo-controlled, parallel-group study was carried
Fuwai Hospital, Peking Union Medical College, Chinese Academy of
out with 4,870 patients (age 18 to 70 years) each with a
Medical Science; bWBL Peking University Biotech Co. Ltd, Beijing;cPeking University Health Science Center; dThe Second Xianya Hospital
documented previous myocardial infarction (MI) in 65 Chi-
of Central South University, Peoples Republic of China; eTexas A&M
nese hospitals. During the prior 60 months, all eligible
School of Medicine, Corpus Christi, Texas; fLankenau Institute for Med-
patients had to have incurred an MI that met appropriate
ical Research, Wynnewood, Pennsylvania. Manuscript received June 8,
diagnostic criteria, including increased serum creatine ki-
2007; revised manuscript received and accepted February 18, 2008.
nase. Other entry criteria were total cholesterol 170 to 250
Members of the Chinese Coronary Secondary Prevention Study Group
mg/dl and triglycerides Յ400 mg/dl. Patients with LDL
cholesterol levels Ͼ180 mg/dl at screening could be retested
This study was supported by the Chinese National Scientific and
after 4 weeks of dietary therapy. Patients who met entry
Technological Projects, Peoples Republic of China, and sponsored by WPL
criteria at screening underwent a 4-week diet control period
Peking University Biotech Co. Ltd (WPU), Beijing, Peoples Republic of
during which all lipid-lowering agents were discontinued.
*Corresponding author: Tel: 610-645-8426; Fax: 610-645-2205.
Patients taking other necessary medications unlikely to alter
plasma lipoproteins at stable doses for 4 prior weeks were
0002-9149/08/$ – see front matter 2008 Elsevier Inc. All rights reserved. The American Journal of Cardiology (www.AJConline.org)
Table 1Baseline characteristics of patients in the placebo and Xuezhikang(XZK) groups
Figure 1. Kaplan-Meier curves for the proportion of patients without
primary events in the XZK and placebo groups.
domization and biannually thereafter. The primary study
end point was the occurrence of a major coronary event that
consisted of nonfatal MI or death from coronary or cardiac
causes. Secondary end points included total CV mortality,
total all-cause mortality, need for coronary revasculariza-
tion, and change in lipoprotein lipids. Plasma samples were
drawn from properly fasted study subjects and obtained at
baseline, 6 to 8 weeks after randomization, and at 6-month
Statistical analysis: Treatment effects of XZK were an-
alyzed using the prespecified primary end point of majorcoronary events. Based on published about 2,350
Data are expressed as mean Ϯ SD or percent. HDL ϭ high-density lipoprotein.
intention-to-treat patients per group was sufficient to have90% power to detect a mean 20% decrease in coronaryevents in the treatment group compared with the placebo
permitted to continue those medications at the same dos-
group after 5 years at p Ͻ0.05 (2 tailed) with a 15% dropout
ages. Patients were randomly assigned at a 1:1 ratio into the
rate. Data for baseline patient characteristics and efficacy
XZK and placebo groups. Lipid levels measured after the
and safety were summarized using descriptive statistics and
4-week dietary period were used as baseline.
analyzed using the chi-square test. Numerical data were
Patients with any of the following concomitant condi-
presented as mean Ϯ SD and 95% confidence interval and
tions at the screening visit of significant CV disorders,
analyzed using the t test. Clinical end points of the trial were
including clinically uncontrolled arrhythmias, cardiac val-
calculated based on prespecified definitions. Baseline data
vular disease, unstable angina, congestive heart failure,
were monitored and processed using Powerbuilder software
planned interventions, systolic blood pressure Ͼ180 mm Hg
(Synbase, Berkeley, California). Cumulative incidence
or diastolic blood pressures Ͼ110 mm Hg, and New York
curves were generated using the Kaplan-Meier method for
Heart Association class III or worse congestive heart fail-
the major end points in both study groups. SPSS 11.5
ure; history of completed stroke; uncontrolled diabetes mel-
software (SPSS Institute, Chicago, Illinois) was used for
litus with fasting plasma glucose Ͼ200 mg/dl; clinically
significant renal or hepatic diseases; active malignancy,excluding nonmelanoma skin cancer; any other uncon-
trolled clinical condition that may alter plasma lipids or beconsidered to pose an undue risk or contraindication to
This trial was carried out from May 1996 to December 2003
study participation; premenopausal women of childbearing
in 65 hospitals in China, led by the Cardiovascular Institute
potential; or history of alcohol or narcotic substance abuse
and Fuwai Hospital at the Chinese Academy of Medical
Sciences. Patients (3,986 men, 884 women) were randomly
Eligible patients were randomly assigned into 1 of the 2
assigned at a ratio of 1:1 into the XZK (n ϭ 2,429) and
groups for twice-daily treatment with XZK 600 mg or
placebo (n ϭ 2,441) groups. The study plan was to enroll
placebo, administered orally for an average of 4.5 years.
4,700 patients with 2 interim analyses as prespecified and to
Clinical visits were set at 6- to 8-week intervals after ran-
discontinue the study upon detection of a significant differ-
Coronary Artery Disease/Effects of Xuezhikang on Coronary Events
Table 2Events according to study group (intention-to-treat population)
CI ϭ confidence interval. * Intention-to-treat population. † Difference between the placebo and XZK groups.
ence for the primary end point between the drug-treated and
patients. A significant (p Ͻ0.01) 4.2% increase in high-density
placebo groups. Because the second interim analysis
lipoprotein cholesterol was observed in the XZK group, with
showed p Ͻ0.05 for the primary end point, the study was
no change in the placebo group. No treatment-related serious
discontinued in June 2003. Mean duration of treatment was
adverse events or deaths were reported during the study period,
and XZK appeared to be well tolerated by patients. Total
The XZK and placebo treatment groups were well
adverse experiences and discontinued participation because of
matched at baseline for plasma lipids, concomitant medica-
these or all causes were similar in both groups. Mild transient
tions, CV risk factors, and other baseline characteristics
gastrointestinal side effects were reported similarly in both
Mean LDL cholesterol was 129 mg/dl in both
groups. Changes in laboratory findings did not differ between
groups at baseline, and 98% of patients completed the study.
the 2 treatment groups. Minor occasional and transient in-
Patients treated with XZK showed a highly significant (p
creases in serum transaminase and creatine kinase were ob-
Ͻ0.001) decrease in frequency of major coronary events,
with 10.4% in the placebo group compared with 5.7% in theXZK-treated group. Thus, treatment with XZK produced
striking relative and absolute decreases of, respectively,45% and 4.7% in major coronary events compared with
Most large clinical trials with statin therapy examined the
placebo. These improved outcomes in XZK-treated patients
impact of about a 25% to 40% fall in LDL cholesterol on
increased progressively during the course of the trial
the occurrence of CV events and mortality. This relation
Treatment with XZK during a 4-year period appeared to
appears to be greater in patients with rather high levels of
have prevented 47 major (17 fatal, 30 nonfatal) coronary
LDL cholesterol. The first placebo-controlled multicenter
events. Moreover, the XZK-treated group experienced
trial with a statin showed a significant decrease in both
highly significant relative decreases of 62% in the occur-
all-cause mortality and CV events in simvastatin-treated
rence of nonfatal MI and 32% in fatal coronary events
patients with increased serum However, be-
These patients also experienced a highly signif-
cause patients with coronary atherosclerosis commonly
icant decrease of about 1⁄3 in both CV and total mortality
compared with those treated with placebo. Patients treated
more information is needed to develop strategies to iden-
with XZK also experienced a 1⁄3 decrease in the need for
tify and treat these patients effectively.
coronary revascularization, which was 2.8% compared with
This trial was designed to test the efficacy and safety of
4.2% in placebo-treated patients. No significant differences
XZK in a Chinese patient population with previous MI and
were observed for other measures, except for deaths caused
average levels of LDL cholesterol to test the impact of this
by cancer 29 patients experienced cancer-related
therapy on recurrent coronary events. Results showed that
death in the placebo group compared with 13 in the XZK-
treatment of this study population with XZK produced pro-
found changes in both lipoprotein lipids and the number of
XZK produced significant decreases in levels of total and
recurrent coronary events. The decrease in these events found
LDL cholesterol and triglycerides and increases in high-den-
in the present study appear to exceed those reported with statin
sity lipoprotein cholesterol compared with placebo
monotherapy in a similar trial of western patients enrolled in
These differences were significant (p Ͻ0.05) by 6 to 8 weeks
the Cholesterol and Recurrent and other statin tri-
after randomization, and were maintained over the study du-
ration. Treatment with XZK also produced a significant (p
However, comparisons of results, treatments, and out-
Ͻ0.001) decline in plasma total cholesterol of 13% from base-
comes in this and other studies require very cautious inter-
line compared with only a 2% decrease in the placebo group.
pretation. Although the 2 populations differed in several
LDL cholesterol was diminished significantly by 20% in the
respects, the potentially greater impact of XZK in Chinese
XZK-treated group compared with 3.5% in placebo-treated
patients reported in this trial should not be interpreted to
The American Journal of Cardiology (www.AJConline.org)
stem solely from the baseline characteristics of the popula-tion tested. The greater effect of XZK may be caused at least
in part by the potential properties of its nonstatin compo-nents. XZK has several ingredients, of which the lovastatincomponent, although quantitatively predominant, is un-likely to account solely for the favorable plasma lipid-
lowering and the rather striking CV benefit found. Thus, itis likely that components other than lovastatin in XZK, such
as lovastatin hydroxy acid, plant sterols, isoflavones, and
isoflavone glycosides, also likely contributed to However, this issue requires additional study. It is important
to acknowledge that the various components of XZK prep-arations have not as yet been adequately isolated, analyzed,and characterized for their consistency, stability, and indi-
vidual pharmacologic and other properties and, therefore,
In conclusion, this study showed that long-term treatment
with XZK significantly decreased the recurrence of coronary
events and total mortality in Chinese patients with average
levels of LDL cholesterol. Moreover, treatment with XZK
significantly improved plasma lipoprotein lipids and was safeand well tolerated by these study participants. However, future
use of this product will depend on the separation, identification,characterization, and development of a carefully formulated
preparation of red yeast rice. Additional studies of its proper-
ties and therapeutic potential are necessary. Appendix Investigators: Fuwai Hospital (Y.S. Xu, D.F. Gu, X. Jia, Z.
Chen, J.L. Sun, J. Chen); Peking University Shougang Hos-
pital (X.H. Yu, J.H. Wang, N. Wang, R.P. Zheng, S.H. Zhang); Heilongjiang Yichun Forrest Industry Central Hos-
pital (C.X. Liu, L.H. Sun, Y.C. Zhao, Y. Lin, J.B. Huang);
Capital Medical University Beijing Chaoyang Hospital(D.Y. Hu, X.C. Yang, Y.Z. Liu, M.M. Gao, P. Zhang);
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Y.Q. Shi, T.S. Hu); Chongqing Medical University First
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Huang); Hebei Baoding Second Hospital (J.C. Zhang, H. Yu, Q.S. Shi, X.Z. Wang, B. Jiang); Shangdong University
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(J. Shu, L.T. Ma, H. Ge, M.J. Zhang, Z.R. Lv); Beijing
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(Y.L. Huang, X.F. Qu, J.J. Li, H. Guo); Shangdong Dezhou
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hai Medical Collage Hospital (L. Li, Y. Liu, Y.P. Li, F. Mei); Shandong Liaocheng Second People’s Hospital (K.Z. Writing committee: Z.L. Lu, S.P. Zhao, Y.F. Wu, B.M.
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SAFETY DATA SHEET 09100 SELKILL FLY SPRAY Trust Hygiene Services Limited 1. IDENTIFICATION OF THE PREPARATION AND COMPANY PRODUCT CODE: PRODUCT NAME: DISTRIBUTOR: 2. COMPOSITION/INFORMATION ON INGREDIENTS The full text for all R-Phrases are displayed in Section 16 3. HAZARDS IDENTIFICATION Limited evidence of a carcinogenic effect. R51/53 Very Toxic to aquatic