Acupuncture treatment for insulin sensitivity of women with polycystic ovary syndrome and insulin resistance: a study protocol for a randomized controlled trial
© The Author(s). 2017
Received: 22 July 2016
Accepted: 17 February 2017
Published: 9 March 2017
Our prospective pilot study of acupuncture affecting insulin sensitivity on polycystic ovary syndrome (PCOS) combined with insulin resistance (IR) showed that acupuncture had a significant effect on improving the insulin sensitivity of PCOS. But there is still no randomized controlled trial to determine the effect of acupuncture on the insulin sensitivity in women with PCOS and IR. In this article, we present the protocol of a randomized controlled trial to compare the effect of true acupuncture on the insulin sensitivity of these patients compared with metformin and sham acupuncture. Acupuncture may be an effective therapeutic alternative that is superior to metformin and sham acupuncture in improving the insulin sensitivity of PCOS combined with IR.
This study is a multi-center, controlled, double-blind, and randomized clinical trial aiming to evaluate the effect of acupuncture on the insulin sensitivity in PCOS combined with IR. In total 342 patients diagnosed with PCOS and IR will be enrolled. Participants will be randomized to one of the three groups: (1) true acupuncture + metformin placebo; (2) sham acupuncture + metformin, and (3) sham acupuncture + metformin placebo. Participants and assessors will be blinded. The acupuncture intervention will be given 3 days per week for a total of 48 treatment sessions during 4 months. Metformin (0.5 g per pill) or placebo will be given, three times per day, and for 4 months.
Primary outcome measures are changes in homeostasis model assessment of insulin resistance (HOMA-IR) and improvement rate of HOMA-IR by oral glucose tolerance test (OGTT) and insulin releasing test (Ins). Secondary outcome measures are homeostasis model assessment-β (HOMA-β), area under the curve for glucose and insulin, frequency of regular menstrual cycles and ovulation, body composition, metabolic profile, hormonal profile, questionnaires, side effect profile, and expectation and credibility of treatment.
Outcome measures are collected at baseline, at the end of treatments, and 3 months after the last acupuncture treatment. On completion of the screening visit, randomization will be conducted using a central randomization system.
This study will investigate the effects of acupuncture on the insulin sensitivity of PCOS and IR women compared with metformin and sham acupuncture. We will test whether true acupuncture with needles placed in skeletal muscles and stimulated manually and by electrical stimulation is more effective than metformin and sham acupuncture with superficial needle placement with no manual or electrical stimulation in improving the insulin sensitivity in PCOS women with IR.
ClinicalTrials.gov, NCT02491333; Chinese Clinical Trial Registry, ChiCTR-ICR-15006639. Registered on 24 June 2015.
KeywordsAcupuncture Metformin Sham acupuncture Polycystic ovary syndrome Insulin resistance
Polycystic ovary syndrome (PCOS) is one of the most common endocrine disorders in reproductive age women. It is characterized by chronic anovulation and hyperandrogenism and is often accompanied by obesity and insulin resistance (IR) as IR is present in nearly 40% of PCOS . In addition, IR, hyperinsulinemia, and dyslipidemia worsen with aging, and the risk of miscarriage is three times higher than in healthy women . They are also at an increased risk of pregnancy complications such as impaired glucose tolerance, gestational diabetes mellitus, pregnancy-induced hypertension and preeclampsia, and small for gestational age children . It may affect general health and the quality of life. Both hyperandrogenism and IR contribute to the pathogenesis of many aspects of PCOS [3, 4].
IR in PCOS results from hyperinsulinemia and defects in the insulin signaling pathway. Further, high concentrations of insulin reduce circulating levels of sex hormone binding globulin (SHBG) and increase levels of free testosterone, and the latter leads to menstrual disturbance, development of ovarian cysts, hirsutism, and anovulatory infertility . IR leads to a higher risk of impaired glucose, type 2 diabetes, dyslipidemia, atherosclerosis, and vascular disease .
The first-line treatment for overweight or obese women with PCOS is modification of diet and lifestyle. This confirmed that the benefit of improved ovulation and live birth with delayed infertility treatment with clomiphene citrate when preceded by lifestyle modification with weight loss was superior to immediate treatment , but for many subjects it is not easy to sustain . Treatments of IR with insulin-sensitizing agents have been used in women with PCOS . Metformin, an insulin-sensitizing agent known to decrease hepatic glucose production via a transient inhibition of the mitochondrial respiratory-chain complex 1 and an activation of the AMP-activated protein kinase (a cellular metabolic sensor ), improves irregular menstrual cycles in women with PCOS whether IR is present or not . Nevertheless, it is not effective in treating hirsutism, acne, or anovulatory infertility . It also has side effects such as gastrointestinal irritation (diarrhea and nausea) and lactic acidosis, which is rare but serious . In addition, metformin is not recommended for patients with kidney, lung, liver, and heart disease or on a low-carbohydrate diet . Other common insulin-sensitizing agents are thiazolidinediones, including troglitazone (which is no longer available for clinical use), rosiglitazone, and pioglitazone . However, rosiglitazone may result in cardiovascular diseases , and pioglitazone may increase the risk of bladder cancer . Both may double the risk of bone fractures . Given that current pharmacological treatments have such side effects, there is an urgent need to find a better and safer therapy for IR in PCOS women.
As an integrated part of Traditional Chinese Medicine and a relatively safe treatment , acupuncture treatment for PCOS has gained increasing attention in recent years. The effect of acupuncture is most likely mediated via activation of sensory nerve fibers, which in turn modulate the sympathetic activity to the ovaries and in the central nervous system [20, 21]. A review found that acupuncture can correct various metabolic disorders contributing to the development of IR, such as hyperglycemia, overweight, hyperphagia, hyperlipidemia, inflammation, altered activity of the sympathetic nervous system, and insulin signal defect . Thus, acupuncture may have the potential to improve insulin sensitivity . Other findings suggest that electrical acupuncture stimulation affects more functional signaling pathways related to insulin sensitivity, while manual stimulation of acupuncture needles has a greater effect on glucose tolerance . Furthermore, in female insulin-resistant rats both electrical and manual acupuncture stimulation enhances insulin sensitivity via activation of sensory afferents . Our prospective pilot study (ClinicalTrials.gov NCT02026323)  of acupuncture affecting the insulin sensitivity in 81 cases of women with PCOS with IR showed that acupuncture has a significant effect on improving the insulin sensitivity in these patients. But there is still no randomized controlled trial to determine the effect of acupuncture on insulin sensitivity in women with PCOS combined with IR.
Thus, we present the protocol of a randomized controlled trial to investigate the effects of acupuncture on the insulin sensitivity of women with PCOS combined with IR. We hypothesize that true acupuncture is superior to metformin and sham acupuncture in improving insulin sensitivity.
The primary objective of this randomized controlled trial is to evaluate the hypothesis that true acupuncture + metformin placebo (group 1) improves insulin sensitivity, as measured by changes in the homeostasis model assessment of insulin resistance (HOMA-IR), more effectively than sham acupuncture + metformin (group 2) and sham acupuncture + metformin placebo (group 3) in women with PCOS and IR. Secondary objectives include changes in HOMA-β (islet β-cell function), C-peptide index, the insulin response to glucose calculated from the oral glucose tolerance test (OGTT) and insulin releasing test (Ins), frequency of the regular menstrual cycle and ovulation, circulating sex steroids, lipid profile, health-related quality of life and symptoms of anxiety and depression, side effects, and credibility.
This is a randomized controlled trial to determine the effect of true acupuncture + metformin placebo for the improvement of insulin sensitivity in women with PCOS and IR compared with sham acupuncture + metformin and sham acupuncture + metformin placebo. The design of this study is compliant with the Consolidated Standards of Reporting Trials (CONSORT) guidelines  and with the Standard Protocol Items: Recommendations for Interventional Trials (SPIRIT) statement 2013  [see Additional file 1].
Patients and enrollment
Chinese women aged from 18 to 40 years.
Body mass index (BMI) ≥18.5 kg/m2.
Confirmed diagnosis of PCOS according to the Rotterdam criteria in 2003 including at least two of the following three features: (1) oligo- (an intermenstrual interval >35 days or <8 cycles in the past year) or amenorrhea (an intermenstrual interval >90 days), and/or (2) polycystic ovarian morphology, i.e., presence of >12 antral follicles (≤9 mm) and/or ovarian volume >10 ml on ultrasonography scanning, and/or (3) clinical and/or biochemical hyperandrogenism. Clinical hyperandrogenism on the Chinese Mainland is defined as a Ferriman-Gallwey (FG) score ≥5 ; biochemical hyperandrogenism is total testosterone (T) >2.6 nmol/l and free testosterone ≥6.0 pg/ml .
Presence of IR as defined by the homeostatic model assessment—HOMA-IR: [fasting insulin (μU/ml) × fasting glucose (mmol/l)] / 22.5). A value ≥2.14 is considered to be indicative of IR .
No immediate fertility wish and willingness to use barrier contraceptive methods for 7 months.
Willingness to sign the consent form.
- (1)Exclusion of other endocrine disorders:
Uncorrected thyroid disease (defined as thyroid stimulating hormone (TSH) < 0.2 mIU/ml or >5.5 mIU/ml, triiodothyronine (T3) < 1.4 nmol/l or >2.2 nmol/l, and free thyroxine (T4) < 10 pmol/l or >23 pmol/l). A normal level within the last year is adequate for entry.
Poorly controlled type I or type II diabetes (defined as a glycosylated hemoglobin (HbA1c) level >7.0%) or patients receiving antidiabetic medications such as insulin, thiazolidinediones, acarbose, or sulfonylureas likely to confound the effects of the study medication; patients currently receiving metformin XR (extended release) for a diagnosis of type I or type II diabetes or for PCOS are also excluded.
Cushing’s syndrome (defined as an archetype of metabolism syndrome. High glucocorticoid levels lead to muscle, liver, and adipocyte insulin resistance; 17-hydorxycorticosteroids >55 umol/24 h or urinary-free cortisol >304 nmol/24 h).
Congenital adrenal hyperplasia (defined as patients with known 21-hydroxylasedeficiency or other enzyme deficiency leading to the phenotype of congenital adrenal hyperplasia; 17-oh progesterone >10 ng/ml in adrenocorticotropic hormone 1-24 h excited test (after 60 min).
Suspected androgen-secreting adrenal or ovarian tumor.
Use of hormonal or other medication including Chinese herbal prescriptions, which may affect the outcome of the last 2 months.
Receiving acupuncture in the past 2 months.
Within 6 weeks of pregnancy.
Post-abortion or postpartum within the past 6 weeks.
Breastfeeding within the last 4 months.
Not willing to give written consent to the study.
Having a bariatric surgery procedure within the past 12 months or being in a period of acute weight loss.
- (9)Additional exclusion criteria include:
Patients on oral contraceptives, depot progestin, or hormonal implants (including Implanon). A 2-month washout period will be required prior to screening for patients on these agents. Longer washouts may be necessary for certain depot contraceptive forms or implants, especially where the implants are still in place. A 1-month washout will be required for patients on oral cyclic progestin.
Patients with a history of or suspected cervical carcinoma, endometrial carcinoma, or breast carcinoma.
Patients enrolled in other studies that require medications.
Patients taking longer than a 1-month break during the protocol should not be enrolled.
Information to all study subjects
All participants will be advised about the importance of regular physical exercise and a balanced diet by a trained dietician before they receive the treatments. Importantly, they are instructed not to change their exercise or diet habits during the entire study period.
True acupuncture or sham acupuncture and metformin will be started 2 days after the baseline visit including OGTT and Ins. All subjects will be asked to use a barrier method for contraception. True and sham acupuncture treatment will be given three times per week. Each treatment session lasts for 30 min and can be separated by an interval of 1-3 days, with a maximum of 48 treatment sessions during 4 months. After the third treatment, all patients fill in the expectation and credibility questionnaire . Metformin (0.5 g per pill) or placebo will be given, three times per day for 4 months.
True acupuncture protocol
The rationale of acupuncture protocols is based on traditional Chinese and Western medical theories, and the study protocol follows the CONSORT  and Standards for Reporting Interventions in Clinical Trials of Acupuncture (STRICTA)  recommendations. We will use fixed acupuncture protocols. The acupuncture protocol of this randomized controlled trial (RCT) follows the protocol in the previous RCT in women with PCOS including Acupuncture to Treat Insulin Resistance in Women With and Without Polycystic Ovary Syndrome (ClinicalTrials.gov NCT01457209) , Acupuncture and Clomiphene Citrate on Live Birth in Anovulatory Women With Polycystic Ovary Syndrome (ClinicalTrials.govNCT01573858) , and a prospective pilot study of the Effect of Acupuncture on Insulin Sensitivity Polycystic Ovary Syndrome (ClinicalTrials.gov NCT02026323) .
Acupuncture protocol 
4 cun caudal to the umbilicus
Fibrous tissue, linea alba
On the midline, 4 cun superior to the umbilicus
Fibrous tissue, linea alba
Guilai (bilateral) (ST29)
1 cun cranial to the pubic bone and 2 cun lateral of the midline
M. rectus abdominis
Liangqiu (bilateral) (ST34)
2 cun above the superior lateral border of the patella on the line connecting the anterior superior iliac spine found with the knee flexed
M. quadriceps femoris
Yinshi (bilateral) (ST33)
3 cun above the superior lateral border of the patella on the line connecting the anterior superior iliac spine found with the knee flexed
M. quadriceps femoris
Sanyinjiao (bilateral) (SP6)
De Qi four times
3 cun proximal to the medial malleolus
Mm. flexor digitorum longus, tibialis posterior
Zusanli (bilateral) (ST36)
De Qi four times
On the anterior lateral side of the leg, 3 cun below Dubi (ST35), one finger width (middle finger) from the anterior crest of the tibia
Musculi tibialis anterior
Hegu (bilateral) (LI4)
De Qi four times
On the highest point at m. interosseus dorsalis
Mm. interosseus dorsalis I, lumbricalis II, adductor pollicis
Daju (bilateral) (ST27)
3 cun cranial to the pubic bone and 2 cun lateral to the midline
M. rectus abdominis
1.5 cun caudal to the umbilicus
Fibrous tissue, linea alba
2 cun cranial to the umbilicus
Fibrous tissue, linea alba
Extra-meridian point (bilateral)
6 cun above the patella in line with SP10
M. quadriceps femoris
Xuehai (bilateral) (SP10)
With the knee flexed, on the medial side of the thigh 2 cun above the superior medial corner of the patella on the prominence of the medial head of the quadriceps muscle of the thigh
M. quadriceps femoris
Sanyinjiao (bilateral) (SP6)
De Qi four times
3 cun proximal to the medial malleolus
Mm. flexor digitorum longus, tibialis posterior
Taichong (bilateral) (LR3)
De Qi four times
Between metatarsal I & II, just distal to the caput
M. interosseus dorsalis I
Neiguan (bilateral) (PC6)
De Qi four times
2 cun proximal to the processus styloideus radii, between the tendons of the palmaris longus and the flexor carpi radialis
M. flexor digitorum superficialis
Needle insertion technique
Needle insertion should be gentle. The skin is tightened by pressing around the area of needle insertion, and the needle is then gently inserted.
Needles and stimulation
Needle size: 0.25 × 30 mm or 0.30 × 40 or 0.30 × 50 mm. Select needle length with respect to the patients’ BMI: 0.25 × 30-mm needles in women with normal BMI, 0.30 × 40-mm needles in overweight women, and 0.30 × 50 or 75-mm needles in obese women. Depth of insertion may vary from patient to patient. Needles are placed with a depth deep enough to reach muscle/fibrous tissue. When a needle is inserted, the needle is stimulated gently until de qi (needle sensation reflecting activation of sensory afferents). As soon as de qi has been reached, the needle does not hurt or cause any pain and discomfort. Manual stimulation of needles that are not attached to an electrical stimulator is stimulated when inserted, after 10 min, 20 min, and immediately before they are removed after 30 min.
The electrodes are attached to an electric stimulation according to the protocol. The electric stimulator is turned on to program 10, and the intensity is gradually increased. The intensity will be as high as possible without causing pain or discomfort of subjects. The stimulation amplitude/intensity will be adjusted after 10 and 20 min at the same time as when manually stimulated needles are manipulated. After 30 min the stimulator is turned off, electrodes are disconnected, and needles are taken out.
Sham acupuncture protocol
Sham acupuncture protocol 
No known point
On top of acromion
C3-4, n. supraclavicularis
No known point
On humerus, behind LI14
C5-6, n. cutaneous brachii lateralis
True and sham acupuncture treatment
Time of the day and the name of the acupuncturist when the patient receives acupuncture will be recorded.
The intensity of stimulation (mA) is noted. It may vary between different electrodes. Note the range, e.g., 1.2 – 3.0 mA.
Note any other events that may affect the treatment (positive or negative).
Note concomitant medications.
Collect menstrual logs at the end of every cycle.
Metformin and placebo
Metformin (Bristol-Myers Squibb Co., Shanghai, China) and placebo tablets (Jaden Pharmaceutical Co., Ltd., Guangzhou, China) will be packed and tested by a commercial pharmacy supply company (Panlongyunhai Pharmaceutical Co., Kunming, Yunnan, China) specifically for this study. Metformin or placebo will be started 2 days after the baseline visit including OGTT and Ins. Subjects will take 0.5 g/time, three times per day for 4 months. If the patients have adverse effects such as nausea and dizziness, the dose will be reduced to 0.5 g/time, two times or one time per day according to the severity.
Monitoring and examination during the treatment
All subjects will be instructed not to change their physical exercise habits or diet during the entire study. They are asked to use barrier contraception, not hormonal contraception. Physical examination will be performed monthly. Every menstruation should be recorded, including the date, volume, and duration of menstruation during the entire study and follow-up. The conditions of physical exercise and diet will be recorded for every cycle.
Study-specific visits and procedures
Overview of study visits
Follow-up after 4 months of treatment
End of treatment visit 3 months after the last acupuncture treatment
OGTT and Ins
Body composition (weight, height, waist circumference, hip circumference, FG/acne)
Menstrual cycle diary
Fasting blood samples for FGLU, FINS, HbA1c, C-peptide, TSH, T3, free T4
Fasting blood samples for FSH, LH, SHBG, T, E2, PRL
Fasting blood samples for ApoA1,ApoB, TC, TG, HDL-C, LDL-C, BRT, renal and liver profile
Transvaginal or transrectal ultrasound
Women are screened in the morning after an overnight 12-h fast. Detailed information about the study design is given.
Obtain signed informed consent
Complete physical examination
Complete physical examinations will be performed including height, weight, hip, and waist measurements. Height and weight will be recorded to the nearest 0.1 cun and 0.1 kg, respectively. Waist and hip circumference will be recorded to the nearest 1 cun. Hirsute assessment by FG, acne standard acne lesion counts, and pelvic examination will be conducted.
Perform transvaginal or transrectal ultrasound of ovaries
Ovaries, including the ovarian size in three dimensions, the size of the largest ovarian follicle/cyst and size of every follicle with a mean diameter greater than 10 mm, and total antral follicle count (small follicles with mean diameter <10 mm) of each ovary will be obtained through transvaginal or transrectal ultrasound.
Check urine pregnancy test
Fasting blood samples to exclude other endocrine disorders
Fasting (at least 4 h) blood samples are taken to exclude any endocrine disorders:
Fasting glucose, fasting insulin, HbA1C (>7%), C-peptide, TSH (<0.2 mIU/ml or >5.5 mIU/ml), T3 (<1.4 nmol/l or >2.2 nmol/l), and free T4 (<10 pmol/l or >23 pmol/l).
Provide progestin prescription to induce withdrawal bleeding, with instructions to begin medication once eligibility has been determined.
After the screening visit, if a woman fulfills inclusion criteria and has signed the informed consent form, she will be assigned to the baseline visit. The baseline visit takes place day 2–5 of a spontaneous period or after a withdrawal bleeding after an overnight fast.
Circulating sex steroids: Fasting serum levels of follicle-stimulating hormone (FSH), luteinizing hormone (LH), estradiol (E2), prolactin (PRL) and T, and sex hormone binding globulin (SHBG).
Lipid profile: Triglycerides (TG), total cholesterol (TC), high-density lipoprotein (HDL-C), low-density lipoprotein (LDL-C), apolipoprotein A1 (ApoA1), apolipoprotein B (ApoB), blood routine test(BRT), and renal and liver profiles.
Glucose homeostasis and insulin sensitivity: The OGTT and Ins with 75 g glucose. Blood samples will be obtained to measure plasma glucose, serum insulin, and C-peptide at 0, 60, and 120 min during the OGTT and Ins.
Quality of life will be assessed by the short form 36 (SF-36) , the Chinese Quality of Life (ChiQOL) , sleeping questionnaires , international physical activity questionnaire (IPAQ) , questionnaire of eating and weight patterns (QEWP) , and the Polycystic Ovary Syndrome Questionnaire (PCOS-QOL) . We will also assess symptoms of anxiety and depression by the Zung SAS and Zung SDS questionnaires and complete the quantization table of traditional Chinese medicine (TCM) syndromes about PCOS.
Assess TCM syndromes of patients
Syndrome differentiation (Bian Zheng) in TCM is the comprehensive analysis of clinical information gained by the four main diagnostic TCM procedures: observation, listening, questioning, and pulse analysis, and it is used to guide the choice of treatment by acupuncture and/or TCM herbal formulae . In PCOS, patients are empirically differentiated into four categories: (1) phlegm-dampness syndrome, (2) blood stasis syndrome, (3) phlegm, and (4) blood stasis.
Visit after 4 months of acupuncture treatment
Physical examination will be performed, including vital signs, height, weight, and hip and waist measurements as well as repeating hirsute and acne assessments after the end of treatment or pregnancy.
The serum levels of sex hormone steroids and the metabolic profile will be repeated.
The transvaginal or transrectal ultrasound will be repeated for antral follicle counts.
OGTT and Ins will be repeated.
Blood will be collected for storage and for determination of DNA and sphingolipid levels.
QOL, sleeping, IPAQ, anxiety/depression questionnaires, QEWP, and the quantization table of TCM will be repeated.
Menstrual logs will be collected.
Adverse events and concomitant medications will be recorded.
The questionnaires about acupuncture treatment will be answered.
End of treatment visit
The end of treatment visit will be done 3 months after the last acupuncture treatment (see points 1-8 under Visit after 4 months of acupuncture treatment). All the subjects will be followed up by visiting the acupuncturists monthly for 3 months. The conditions of physical exercise and diet will be record every month.
Adverse events will be categorized and the percentage of patients experiencing adverse events and serious adverse events during the treatment period and follow-up period will be documented and reported to the Data and Safety Monitoring Board (DSMB). These will be reviewed on a quarterly basis by the DSMB, and serious adverse events will be immediately reviewed.
Change in HOMA-IR.
Improvement rate of HOMA-IR.
HOMA-β: Islet β-cell function will be evaluated by the formula (20 × fasting insulin (mU/ml) / (fasting plasma glucose (mmol/l) − 3.5))  and by the C-peptide index (CPI) Fasting C-peptide (nmol/l)/f-glucose (mmol/l) × 100 .
The insulin response to glucose will be assessed by calculating the area under the curve during the OGTT and Ins performance for glucose (AUCglu) and insulin (AUCins) using the trapezoidal rule .
Frequency of menstrual cycles and ovulation.
Body composition: weight, BMI, waist-to-hip circumference, and FG and acne lesion counts.
Metabolic profile: glucose and insulin concentrations, C-peptide, HbA1c, TC, TG, HDL-C and LDL-C, and ApoA1 and ApoB.
Hormonal profile: FSH, LH, T, and SHBG.
Questionnaires: SF-36, ChiQOL, sleeping questionnaires, IPAQ,QEWP, PCOS-QOL, Zung SAS, Zung SDS questionnaires, and the quantization table of TCM syndromes about PCOS will be used to assess the quality of life and sleep and the emotional state and to measure the moderate physical activity.
Side effect profile.
Expectation and credibility of treatment.
Data management and quality control of data
Both the Case Record Form (CRF) and web-based electronic database will be used to manage individual participant data. Quality control of the data will be handled at two different levels: the investigators will be required to ensure the accuracy of the data as the first level of control when they input the records in CRF. The second level will include data monitoring and validation that will be carried out by an independent group. A web-based electronic database, ResMan (www.medresman.org), is used as a double input database. Finally, the individual participant data except the private information will be allowed to be share with the public within 6 months after the trial completion.
Sample size calculations
In our pilot study  evaluating the effect of acupuncture on insulin sensitivity in PCOS women with IR, HOMA-IR reduced significantly after 3 months of acupuncture treatment when an interim analysis was performed and changed from (4.3 ± 2.5) vs. (3.7 ± 2.1). HOMA-IR ≥2.14 was considered to be abnormal. We anticipate that the HOMA-IR after 4 months of true acupuncture treatment will decrease 25%, and sham acupuncture will be decreased 5% as it is well known that sham is not an inert procedure. Therefore, the difference is 20%, with two-sided α assigned to be 5% and β 20% at the upper limit, respectively, at which the power is 80% and the rate of attrition estimated to be 20%. Thus, the sample size has been inflated from 95 to 114 per group, totaling 342 cases for the three arms. The sample size was calculated using the software statistics toolkit supported by the Department of Obstetrics and Gynecology of the Chinese University of Hong Kong (http://www.obg.cuhk.edu.hk/ResearchSupport/StatTools/index.php).
Randomization and patient allocation
Subjects will be randomly allocated into one of the three treatment arms by a 1:1:1 treatment ratio: (1) true acupuncture + metformin placebo, (2) sham acupuncture + metformin, and (3) sham acupuncture + metformin placebo. The Data Coordination Centre (DCC) statisticians will generate the randomization scheme for the study. The true and sham acupuncture treatments will be known only to the acupuncturists besides the DCC data manager. The metformin and placebo having the same package will be organized in a kit consisting of 4 sacks for each subject with 336 tablets in total, respectively. The kit will be labeled with an ID number mapped to the metformin and placebo known only to the DCC personnel. The metformin and placebo assignments will be double-blind to any site investigators.
A central randomization system will be used to allocate patients. Patients will be stratified based on three sites and randomly assigned. The Chinese Clinical Trial Registry takes the responsibility for generation of the random number sequence by computer software, and the allocation sequence is deposited in ResMan, a web-based database. When a new participant enrolls, the allocation information will be obtained by inputting a special password in ResMan. It is not possible to speculate the allocation status of the participant before getting the information.
Statistical analysis strategy
The Kolmogorov-Smirnov test will be used to test the normal distribution of continuous variables. Continuous variables will be presented by mean ± standard deviation if they are normally distributed or by median with interquartile range if they are not normally distributed. Both per protocol (PP) analysis and intention-to-treat analysis (ITT) will be used to determine the robustness of the evidence. Analysis of variance (ANOVA) with Bonferroni corrections will be used for comparing the differences between groups of continuous data in accordance with a normal distribution or Kruskal-Wallis test for non-normal distribution data when appropriate; χ2 tests will be used for comparison of dichotomous data. For the primary outcome, analysis of covariance (ANCOVA) (accompanying LSMEAN and 95% CI) will be used. ANOVA will be used to calculate the changes from baseline to after treatment and follow-up, respectively, and it will also be used to compare the differences between treatment arms with respect to the primary outcome, HOMA-IR. Effect of continuous data will be reported by both P-value and mean difference with 95% confidence interval and categorical data by P-value and relative risk (RR) and risk difference (RD) with 95% confidence interval; the number needed to treat (NNT) will be calculated if there is statistical significance between groups. All statistical analyses of the data will be performed by using SPSS software version 21.0 (SPSS Inc., Chicago, IL, USA).
Although we have confirmed that the combination of manual and low frequency EA can improve insulin sensitivity, hormone levels, and anxiety situation in patients with PCOS by the prospective study (ClinicalTrials.gov NCT02026323) , it had the limitation of being a single center study without comparison groups. There is still a lack of high-quality studies to determine the effect of acupuncture on insulin sensitivity in PCOS women and IR.
Based on the results of the prospective observational study (ClinicalTrials.gov NCT02026323) , we designed this randomized, double-blind, placebo-controlled, and multi-center study protocol to evaluate whether acupuncture treatment is more effective than metformin and sham acupuncture in improving the insulin sensitivity of PCOS and IR. The use of a larger sample size in a randomized setting, controlled by sham acupuncture and common medicine of insulin-sensitizing agents, will reduce the risk of type II error. Therefore, the results of this study may provide evidence for using acupuncture in future clinical practice in this area.
The study was registered at ClinicalTrials.gov on 24 June 2015. Recruitment was started on 11 November 2015 and is expected to end in March 2018. Recruitment is ongoing and 114 participants were randomized as of the end of December 2016. The final report will be available in 2018.
The DSMB members include Mei Han (Beijing University of Chinese Medicine) and Min Hu (Goteborg University) chaired by Hongying Kuang at Heilongjiang University of Chinese Medicine.
This work was supported in part by the Natural Science Foundation of Guangdong Province in China (grant no. 2015A030310508) and funded by the Science and Technology Planning Project of Guangdong Province in China (grant no. 2014A020221060).
Availability of data and materials
Upon the completion of the study, supporting data will be available upon request.
JL and EHYN contributed equally to this work. JL drafted the manuscript for important intellectual content and sought funding and ethical approval. EHYN conceived and designed the study and critically revised the manuscript for important intellectual content. ESV critically revised the manuscript for important intellectual content and designed the acupuncture protocol. ZH, XS, HW, ML, CX, and NS had input to the design of the study and recruited subjects. ML helped to draft the manuscript and carried out acupuncture treatment. CY and JL carried out acupuncture treatment. TW was responsible for randomization and data management. HM conceived and designed the study and sought funding and ethical approval. All authors read and approved the final manuscript.
The authors declare that they have no competing interests.
Consent for publication
Ethics approval and consent to participate
This study had been approved by the ethics committee of the First Affiliated Hospital of Guangzhou Medical University, Xuzhou Maternity & Child Health Hospital, Dalian Municipal Women and Children’s Medical Center, Guangdong Women and Children’s Hospital, and Hexian Memorial Affiliated Hospital of Southern Medical University (Reference: 2015010). All participants signed the informed consent form prior to participation.
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