This article reviews how acupuncture is thought to work, data on acupuncture for managing pain caused by cancer or by cancer treatment, how acupuncture is practiced in the US medical system, discussion of safety issues, and practical tips on how to integrate acupuncture into cancer care.
Oncology (Williston Park). 32(6):310-6.
Figure. Acupuncture Procedure.
Table 1. RCTs of Acupuncture for Pain Related to Cancer
Table 2. RCTs of Acupuncture (AC) for AIAA/AIMSS
Table 3. RCTs of Acupuncture (AC) for CIPN
Table 4. Safety Precautions to Observe With Acupuncture for Cancer Patients
This article summarizes the current evidence regarding the use of acupuncture for pain management in cancer patients. It includes a description of how acupuncture is thought to work and what the intervention entails, data on acupuncture for managing pain caused by cancer or by cancer treatment (radiation, chemotherapy, endocrine therapy), how acupuncture is practiced in the US medical system, discussion of safety issues, and practical tips on how to integrate acupuncture into cancer care.
Pain is one of the most common, burdensome, and feared symptoms experienced by cancer patients.[1] Common sources of cancer pain can include the cancer itself, such as in bone metastasis, soft-tissue infiltration, or nerve compression, as well as the various modalities of cancer treatment, such as in chemotherapy-induced mucositis,[2] chemotherapy-induced musculoskeletal pain,[3] radiation dermatitis,[4] or radiation enteritis.[5] For many survivors, pain may become a long-term sequela of cancer treatment. In particular, taxanes, platinum compounds, vincristine, and bortezomib can cause chemotherapy-induced peripheral neuropathy that can manifest as long-lasting pain in some patients[6]; and aromatase inhibitors can cause persistent diffuse joint pain.[7]
Pain management for cancer patients encompasses both pharmacologic and nonpharmacologic interventions.[8] For pharmacologic options, mainstays for managing somatic pain include acetaminophen, nonsteroidal anti-inflammatory drugs, and opioids. Anticonvulsants such as gabapentin and pregabalin are used for neuropathic pain. Antidepressants, anxiolytics, and corticosteroids are sometimes used as adjuncts to enhance pain control. Aversion to treatment side effects and fear of developing addiction or tolerance are cited as reasons that patients may be reluctant to take adequate pain medicine.[9,10]
Nonpharmacologic interventions are an important part of a comprehensive pain management plan. Since January 2018, the Joint Commission, which accredits more than 20,000 US healthcare facilities, has required hospitals to pay more attention to safe opioid use and to include nonpharmacologic pain treatment modalities in its standard for pain management.[11] In addition, a recent National Cancer Institute (NCI) symposium on acupuncture highlighted the clinical evidence for its use in oncology symptom management.[12] Acupuncture is one of the nonpharmacologic interventions associated with fewer side effects and should be part of a multimodal approach to the management of pain.[13-15]
Acupuncture originated as a therapeutic modality in traditional Chinese medicine.[16] Its theoretical foundation can be traced back to Neijing (“The Yellow Emperor’s Classic of Internal Medicine”), compiled between 305 and 204 BCE. A relatively complete description of meridians and acupuncture points (or acupoints) on the body can be found in Zhenjiu jiayi jing (“Numbered book on acupuncture and moxibustion”), the oldest surviving writing on acupuncture and moxibustion (the application of heat to certain points on the body) published around 260 CE. Classical acupuncture involves the insertion of needles at selected acupoints to a defined depth, followed by manipulation with physical forces, heat, or more recently, electrical stimuli.
According to traditional Chinese medicine, vital energy (“chi” or “qi” in Chinese) flows throughout the body along meridian pathways. Interruption or obstruction of qi was believed to make one vulnerable to illness. The insertion of needles at specific meridian acupoints was thought to regulate the flow of qi, thus producing therapeutic benefit.
Although the ideas of qi and meridians are inconsistent with the modern understanding of human anatomy and physiology, recent neuroscience research suggests that acupuncture may provide clinical effects by modulating the nervous system. Neurotransmitters identified in laboratory research and neuronal matrices activated or deactivated during acupuncture have been observed in functional neuroimaging (functional MRI or positron emission tomography) studies.[17] Therefore, qi and meridians can be seen as vehicles used by ancient people to explain clinical responses observed during acupuncture.[18]
In a typical acupuncture treatment, the therapist interviews the patient; performs a physical examination, including pulse and tongue appearance (regarded as windows into the patient’s hemodynamic and microcirculation status); and then arrives at a traditional Chinese medicine diagnosis, which describes syndrome patterns rather than pathologic processes. For example, a constellation of insomnia, irritability, racing thoughts, dry mouth, and hot flashes represents the “heart fire” pattern. Acupoints are then selected based on the pattern diagnosis.
Single-use, sterile stainless steel needles protected by a guide tube are used in modern acupuncture practice. Acupuncture needles are filiform and very thin (28–40 gauge), similar to or thinner than insulin needles. In the United States, acupuncture needles are classified as medical devices. In a typical treatment, acupoints are located and the sites cleaned with alcohol swabs. The needle and its guide tube are placed at each site. A gentle tap applied to the top of the needle makes it penetrate the skin. The guide tube is then removed, and the needle advanced to the desired depth in a gentle twisting and pushing movement (Figure). The therapist may decide to apply heat or electrical stimuli to the needle. Traditionally, heat stimulation is provided by attaching a burning mound of the herb Artemisia vulgaris to the needle. In modern practice, it is provided by a heat lamp. In electroacupuncture, a small electric pulse–generating device connects to pairs of acupuncture needles to deliver electrical stimulation to the acupoints, in a manner akin to transcutaneous electrical nerve stimulation (TENS).
Only a few randomized controlled trials (RCTs; five altogether [total N = 285]) have been conducted to specifically evaluate acupuncture for cancer-related pain (Table 1).[19] RCTs analyzed in a Cochrane review had either crossover or parallel group designs and excluded treatment-related pain such as chemotherapy-induced neuropathic pain or postoperative pain. Interventions included any type of invasive acupuncture: manual, auricular, or electroacupuncture. Comparison groups included no treatment, conventional treatment, sham nonpenetrative acupuncture, or penetrative acupuncture at non-acupuncture points. Primary outcomes were pain scores on scales such as visual analog scales (VAS) or numerical rating scales (NRS), or verbal reporting. Secondary outcomes included quality of life, patient satisfaction, decrease in analgesic consumption, length of hospital and hospice stay, and any adverse events (AEs).
In 1998, Dang and Yang compared 48 gastric cancer patients in two acupuncture groups with a Western medication group that received conventional medication based on the World Health Organization (WHO) analgesic ladder, and with a no-intervention control group. Patients in the Western medication group experienced more effective immediate analgesia during the first 10 days than did patients in the filiform needle or point injection groups, but by the final 10 days of the 2-month treatment period, the effects were similar. There were no significant differences between groups in either transient or long-term effects.[20] In 2003, Alimi and colleagues focused on auricular acupuncture for cancer-related neuropathic pain in 90 patients randomly divided among three groups: one group received two courses of auricular acupuncture at points where an electrodermal signal had been detected; and two placebo groups received auricular acupuncture either at points with no electrodermal signal (placebo points) or with auricular seeds fixed at placebo points. A decrease in VAS scores at 1 and 2 months with auricular acupuncture was found.[21] In 2008, Chen compared acupuncture with oral medication based on the WHO analgesic scale in 66 patients with late-stage unspecified cancer pain.[22] The percentage of participants showing ≥ 31% improvement in VAS scores was significantly higher with acupuncture (94.1% vs 87.5%; P < .05).
The Lu 2012 study randomized 21 women with ovarian cancer, peritoneal cancer, or uterine cancer to receive electroacupuncture or sham electroacupuncture. Although there were no significant differences in reported pain levels after baseline adjustments, improvements in the quality of life measure of social functioning were observed with electroacupuncture.[23] Finally, in 2013, Chen compared electroacupuncture vs sham placebo needles with no electric stimulation in 60 pancreatic cancer patients.[24] After three treatments, pain intensity measured using an NRS had been significantly reduced by electroacupuncture but not by sham acupuncture. Differences between the two groups were significant at treatment day 3 and again 2 days post-treatment.
The Cochrane analysis reveals a paucity of high-quality studies on acupuncture for cancer pain. No RCTs of acupuncture for pain directly related to cancer have been published since. The small samples sizes, inadequate blinding descriptions, heterogeneous cancer diagnoses, and different study methodologies do not allow for a definitive conclusion. At this juncture, it is fair to say that preliminary evidence suggests acupuncture may be effective for certain kinds of cancer pain in some patients. A short course of acupuncture can be considered for patients with intractable pain that is not adequately controlled otherwise. However, the evidence is not strong enough for us to recommend acupuncture as part of standard care for the management of pain directly related to cancer in adult patients.[19]
Two types of pain caused by cancer treatment in which several acupuncture studies have been conducted are: (1) aromatase inhibitor–associated arthralgia (AIAA) and aromatase inhibitor–associated musculoskeletal symptoms (AIMSS) and (2) chemotherapy-induced peripheral neuropathy (CIPN).
Patients receiving hormone therapy with aromatase inhibitors such as anastrozole, letrozole, or exemestane frequently report debilitating AIAA and AIMSS. A recent meta-analysis has identified three well-designed RCTs that support the use of acupuncture for these symptoms (Table 2).[25] In a three-arm trial conducted by Mao and colleagues[26] in 67 breast cancer patients, electroacupuncture produced clinically important and durable pain reduction as measured with the Brief Pain Inventory at weeks 8 and 12 (P = .0004 and P < .0001, respectively). In a study by Crew and colleagues,[27] 6 weeks of treatment with manual acupuncture produced significant reductions in pain scores in 38 evaluable patients (P < .001), as well as reductions in pain severity (P = .003) and pain-related interference with activities of daily living (P = .002), as compared with non-acupoint sham acupuncture. In a study by Bao and colleagues[28] in 47 evaluable breast cancer patients with AIAA, pain improvements after 8 weeks of treatment were not significantly different between manual and sham acupuncture. However, the sham treatment in this protocol may not have been equivalent to placebo because the nonpenetrating retractable needles used at non-acupuncture points still produced significant skin stimulation, and may therefore have elicited physiologic changes. Interestingly, at the end of treatment, there was a significant reduction in the proinflammatory cytokine interleukin 17, previously implicated in AIMSS, in both groups (P ≤ .009). Importantly, these acupuncture interventions were well tolerated and deemed to be safe, with no infection or lymphedema observed among postmenopausal breast cancer participants. A recent multicenter trial funded by the Southwest Oncology Group found long-term efficacy for acupuncture compared with sham acupuncture.[29]
Patients treated with anticancer agents such as platinums, taxanes, vinca alkaloids, bortezomib, and thalidomide may experience CIPN. Persistent debilitating symptoms include pain, numbness, tingling, and autonomic neuropathy.[30,31] Among pharmacologic interventions, only duloxetine is recommended, with moderate support, for the treatment of neuropathic pain.[32,33]
Three RCTs have evaluated acupuncture for CIPN, with mixed results (Table 3). In 98 patients with multiple myeloma, manual acupuncture along with methylcobalamin was significantly better than methylcobalamin alone, as measured by VAS pain scores, the Functional Assessment of Cancer Therapy/Gynecologic Oncology Group–Neurotoxicity subscale, and nerve conduction velocity studies.[34] However, two RCTs of electroacupuncture produced negative results. A four-arm study in 60 patients randomly assigned to electroacupuncture, electroacupuncture with hydroelectric baths, high-dose vitamin B1/B6, or placebo found no significant differences in improvements.[35] In a CIPN prevention trial, there were no differences between groups at treatment end among 48 evaluable breast cancer patients who received either electroacupuncture or sham treatment during taxane chemotherapy.[36] Moreover, electroacupuncture was associated with worse symptoms and longer time to recover from the pain for which the patients were receiving treatment. These mixed results suggest that certain forms of acupuncture (manual vs electrical) and time of intervention (prevention vs treatment) may affect efficacy outcomes. In addition, low CIPN severity at baseline, inadequate sample size, and the potential for a sham to induce some effect may influence results.[34] Additional RCTs with larger sample sizes, placebo controls, objective endpoints such as nerve conduction studies, and quantitative sensory testing or functional MRIs are needed.
Acupuncture has become increasingly integrated into mainstream supportive cancer care in the United States as a result of the increasing evidence base and patient preferences. In a recent study of 592 breast cancer survivors, patients preferred acupuncture at rates similar to those for drugs to manage pain.[37] Higher expectation of benefit, lower perceived barriers, and stronger natural health beliefs predicted preferences for acupuncture over drugs. Acupuncture services are offered at 73% of NCI Comprehensive Cancer Centers.[38] The extent to which acupuncture is integrated into mainstream healthcare varies by geography, institution, patient population, and insurance coverage. The number of physicians who perform acupuncture is unknown, as state laws vary, with some requiring from 100 to 300 hours of additional acupuncture training, while others consider acupuncture within the scope of practicing medicine and do not require additional training. The American Academy of Medical Acupuncture, the board of which has more than 470 certified diplomats, represents more than 1,300 physician acupuncturists in North America, as well as international members.
There are more than 27,000 licensed non-physician acupuncturists in the United States, with most located in California, Florida, and New York. Most states grant licenses or certifications to individuals who are not medical school graduates if they have successfully completed training in a qualified program of traditional Oriental medicine (usually 2,000 hours). The National Certification Commission for Acupuncture and Oriental Medicine validates entry-level competency in the practice of acupuncture and Oriental medicine through professional certification. In some states, acupuncture can also be provided by chiropractors, dentists, and podiatrists who may not have received additional acupuncture training.[39,40]
Although insurance plans vary and most do not cover this modality, acupuncture coverage has increased in recent years under certain conditions. For example, some may cover acupuncture treatment only if it is deemed medically necessary and provided by a legally qualified physician practicing within the scope of his or her license. Chronic pain and nausea/vomiting are the most common indications that qualify as medically necessary. If a symptom does not improve after 4 weeks, further acupuncture treatment is considered medically unnecessary.[41] Medicare and Medicaid do not cover acupuncture under any circumstances. Due to these limitations, many patients have to pay out of pocket for acupuncture treatments, and financial factors therefore remain the most significant barrier.
Acupuncture is generally safe when performed by qualified practitioners. The most common AEs are minor bleeding, needling pain, or faintness (needle shock). Serious AEs are extremely rare. Only 94 minor AEs were reported across 65,000 treatments over a period of 6 years in Japan.[42] Minor bleeding or hematoma was reported following 1 in 5 treatments in a Swedish study of 9,000 acupuncture treatments; fatigue, sweating, and other minor AEs were rare.[43] The largest series to date-over 760,000 treatments in 97,733 patients in Germany-reported only 6 cases of potentially serious AEs, including exacerbated depression, hypertensive crisis, vasovagal reaction, asthma attack, and pneumothorax.[44]
Special precautions are required in cancer patients, especially those undergoing active treatment who may be prone to infection or bleeding (Table 4). In addition, practitioners should use clean needle techniques and observe universal precautions for all patients.
Although some medical centers have acupuncturists on staff, most oncology clinicians do not have in-house access to acupuncturists. To make acupuncture accessible to their patients, clinicians should cultivate relationships with, or at least be aware of, a few licensed or certified acupuncturists in their community whom they trust and to whom they can refer patients.
If clinicians do not know any acupuncturists in the community, they may want to consult their colleagues in physical medicine, sports medicine, rehabilitation medicine, pain medicine, or infertility medicine. Clinicians in those fields are more likely to have already incorporated acupuncture in their practice, and thus may have some names to recommend. These acupuncturists should have good professional judgment and be aware of the safety precautions and common acupuncture point prescriptions and needling techniques that have been shown to be effective for specific symptoms.
There are several training courses offered by academic cancer centers that train acupuncturists in such skills. Our institution, Memorial Sloan Kettering, offers online continuing education courses for licensed acupuncturists and traditional Chinese medicine professionals that are specifically designed to address the use of acupuncture in the cancer patient.
It is also helpful for clinicians to be aware of whether acupuncture treatments are covered under their patients’ insurance plans and for what indications, so that proper referrals can be made. Once their patients start to receive acupuncture, clinicians should monitor for symptom improvement or lack thereof. Such monitoring can help clinicians know which acupuncturists are particularly skilled in treating cancer patients.
Financial Disclosure:The authors’ work on acupuncture for cancer pain has been supported by funding from the National Institutes of Health/National Cancer Institute Cancer Center Support Grant P30 CA008748.
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