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J Cancer 2021; 12(23):7003-7009. doi:10.7150/jca.55803 This issue Cite

Review

The Therapeutic Effects of Acupuncture and Electroacupuncture on Cancer-related Symptoms and Side-Effects

Qiu-Qin Han^1,2,3, Yi Fu^1,2,3, Jia-Mei Le^1,2,3, Yu-Jie Ma^1,2,3, Xin-Dong Wei^1,2,3, Hou-Lin Ji^1,2,3, Haochen Jiang^4,5, Yueqiu Gao^4,5 , Hailong Wu^1,2,3

1. Shanghai University of Medicine & Health Sciences Affiliated Zhoupu Hospital, Shanghai 201318, China.
2. Shanghai Key Laboratory of Molecular Imaging, Shanghai University of Medicine & Health Sciences, Shanghai 201318, China.
3. Collaborative Innovation Center for Biomedicine, Shanghai University of Medicine & Health Sciences, Shanghai 201318, China.
4. Institute of Clinical Immunology, Department of Liver Diseases, Central Laboratory, Shuguang Hospital Affiliated to Shanghai University of Traditional Chinese Medicine, Shanghai 200021, China.
5. Laboratory of Cellular Immunity, Shuguang Hospital Affiliated to Shanghai University of Traditional Chinese Medicine, Shanghai 200021, China.

✉ Corresponding authors: Hailong Wu (E-mail: wuhledu.cn); Yueqiu Gao (E-mail: gaoyueqiucom).

Abstract

In addition to cancer-related death, malignant progression also leads to a series of symptoms and side-effects, which would detrimentally affect cancer patients' the quality of life, adversely influence their adherence to treatments, and, therefore, negatively affect their long-term survival. Acupuncture and electroacupuncture (EA), as two classic treatment methods in traditional Chinese medicine, have been widely employed to cure various diseases. Recently, the clinical application of acupuncture and EA in cancer patients has received great attention. In this review, we summarized the clinical application of acupuncture and EA in alleviating the cancer symptoms, reducing the cancer treatment-related side-effects, and relieving the cancer pain. The symptoms and side-effects discussed in this review include fatigue, insomnia, chemotherapy-associated dyspepsia syndrome (CADS), pain, xerostomia, and anxiety and depression. The underlying mechanisms of the therapeutic effects of acupuncture and EA might be related to the regulation of the mitochondrial function, coordination of the activity of the nervous system, adjustment of the production of neurotransmitters, and alleviation of the immune responses. In conclusion, acupuncture and EA have been proved to be beneficial for cancer patients. More research, however, is required to clarify the potential mechanisms behind acupuncture and EA for widespread adoption in clinical application.

Keywords: acupuncture, electroacupuncture, cancer, surgery, chemotherapy, pain

Introduction

Carcinoma is the leading cause of global morbidity and mortality, so cancer prevention and treatment have become the key research topic in the medical field. In addition to death, the progression of cancer is also accompanied by a series of symptoms and side-effects that is caused by not only cancer itself but also cancer-related therapies, such as surgery, chemotherapy, radiotherapy, etc. These symptoms and side-effects will severely impact the life quality and treatment adherence of cancer patients, and, therefore, adversely affect their long-term survival. Recently, complementary and alternative medicine (CAM), including acupuncture, deep breathing exercises, massage therapy, meditation, naturopathy, and yoga, has been increasingly adopted by cancer patients for seeking relief from cancer-associated symptoms [1]. Among them, acupuncture, a well-practiced therapeutic approach in traditional Chinese medicine, has been implicated as an effective approach in improving cancer-associated symptoms [1].

Acupuncture has been defined as the insertion of fine needles into specific acupuncture points (acupoints) in the human body. In Eastern Asia, acupuncture has been widely employed to treat various diseases for over 2,500 years. Notably, the benefits of acupuncture in treating various diseases have been gradually recognized by Western society. For example, the World Health Organization (WHO) and the National Institutes of Health (NIH) released a report on acupuncture in 2003, suggesting more than 100 types of diseases and conditions could be treated by acupuncture [2]; the NIH issued a Consensus Statement on Acupuncture to support the use of acupuncture for adult postoperative and chemotherapy-associated nausea and vomiting, postoperative dental pain, addiction, stroke rehabilitation, headache, menstrual cramps, fibromyalgia, myofascial pain, osteoarthritis, low back pain, carpal tunnel syndrome, and asthma [3]; the FDA had approved acupuncture needles for use by licensed practitioners [4]; the number of total licensed acupuncturists has increased 257% from 1998 to 2018 in the United States [5]. Recently, a study on integrative oncology (IO) service in North America, Europe, and Australia showed that acupuncture is one of the most frequent IO services in the United States and the European Union [6].

Electroacupuncture (EA) is developed around the mid-1900s and is a modified approach of acupuncture that applying weak electronic currents through the needles after conventional acupuncture procedure. Although it is still controversial, EA has been shown to achieve similar or even better effects compared to acupuncture. Moreover, the efficacy of acupuncture mainly depends on the manipulation technique of the acupuncturist, but EA can be practiced more reproducibly and is more suitable for both basic and clinical research. In this review, we introduced the effects of acupuncture and EA on cancer-related symptoms and side-effects, the possible mechanisms behind acupuncture, and the hindrance against the wide application of acupuncture and EA in cancer-related treatment.

Effects of acupuncture and EA on the symptoms and side-effects related to cancer and cancer treatment

Cancer and cancer treatments are frequently associated with a lot of symptoms and side-effects including fatigue, insomnia, chemotherapy-associated dyspepsia syndrome (CADS), radiation-induced xerostomia (RIX), pain, vomit and nausea, cognitive impairment, distress, anxiety, depression, etc. Because some of those symptoms and side-effects are tightly related, we mainly discussed the therapeutic potential of acupuncture and EA in some of those symptoms and side-effects in this review.

Fatigue

Cancer-related fatigue (CRF) has been recognized as one of the most common cancer-related side-effects [7] and usually cannot be alleviated by adequate sleep or rest [8]. The onset of CRF commonly occurs before the cancer treatments and it frequently gets worse during the therapies [9, 10]. Although cancer patients usually will be relieved from CRF after treatment completion, near 25% to 30% of cured patients still suffer persistent fatigue for up to 10 years [11, 12]. More importantly, CRF has been recognized as a risk factor for short survival in cancer patients [13, 14].

The effective treatment options for CRF are limited, consisting of non-pharmacologic interventions like physical activity and psychosocial and mind-body interventions. However, a recent clinical trial, including 302 breast cancer outpatients, showed that acupuncture could significantly relieve CRF [15]. Meanwhile, EA has been shown to significantly improve fatigue in breast cancer patients treated with aromatase inhibitors [16, 17]. In addition, acupuncture has been shown to improve fatigue in lung cancer patients [18] and head and neck cancer (HNC) patients, who were subjected to chemoradiation therapy [19]. Furthermore, a meta-analysis study on ten randomized controlled trials confirmed acupuncture as an effective means for CRF [20]. Therefore, acupuncture and EA could serve as an effective and feasible approach to relieve CRF.

Insomnia

Insomnia, also called sleeplessness, is recognized as the most prevalent sleep problem worldwide. The reported prevalence of insomnia in cancer patients is up to 50%, which is three times higher than that in the general population [21]. As cancer-related insomnia (CRI) is frequently viewed as a normal and transient response to cancer itself or cancer treatment, CRI is commonly neglected by both clinicians and cancer patients, leading to having a chronic insomnia symptom in a substantial proportion of cancer patients [22-24]. CRI could be treated by both pharmacologic and non-pharmacologic approaches. Hypnotic agents, including Benzodiazepines (BZDs) and non-BZDs agents, and antidepressants, such as amitriptyline, doxepin, mirtazapine, and trazodone, are commonly used in the pharmacologic treatment of CRI [25]. Although medication could improve sleep outcomes in the short-term, the significant side-effects and the concerns of drug-drug interactions limit their use. Meanwhile, as the non-pharmacologic approaches, acupuncture and EA have been shown to be effective for treating primary insomnia [26], insomnia after stroke [27], menopause insomnia [28], and chronic pain-related insomnia [29], but whether they are effective to treat CRI remains controversial. A previous study recruited 6 randomized controlled trials only showed a low level of evidence supporting the therapeutic advantage of acupuncture in the treatment of CRI [30]. On the contrary, other studies showed that acupuncture could produce meaningful and durable improvements in CRI in cancer survivors [31] and patients [32]. However, all of these studies suffer the weakness of a small sample size, so more adequately powered clinical trials are needed to clarify the therapeutic efficacy of acupuncture and EA in treating CRI.

Chemotherapy-Associated Dyspepsia Syndrome (CADS)

Chemotherapy is routinely employed in combination with radiotherapy, surgery, hormone therapy, or immunotherapy for treating many types of cancers. Despite the effectiveness in reducing tumor burden, chemotherapy also unavoidably raises many irreparable side-effects, such as chemotherapy-associated dyspepsia syndrome (CADS). CADS is defined as a collection of gastrointestinal symptoms after receiving chemotherapy, including early satiety, anorexia, diarrhea, nausea, and vomiting [33]. It has been reported that up to 20% of cancer patients had to postpone or even terminate potentially curative chemotherapy due to CADS [34]. Although prophylactic administration of antiemetics can reduce nausea and vomiting in 70-90% of cancer patients [35], these antiemetics have limited effects on chemotherapy-induced early satiety, anorexia, and diarrhea.

Acupuncture has been commonly employed in China to treat gastrointestinal symptoms for thousands of years and the possible mechanisms behind might be through the altering acid secretion, GI motility, and visceral pain [36]. A previous study has demonstrated that chronic EA at ST36 can improve cisplatin-induced dyspepsia symptoms and gastric dysmotility in rats probably by enhancing vagal efferent activity and reducing satiety hormones [37]. In addition, EA at CV12 has shown to be effective to improve cisplatin treatment-induced anorexia in rats [9]. More importantly, several randomized multicenter crossover studies have shown that acupuncture could serve as a supportive antiemetic approach to reduce the medical use of antiemetics in pediatric cancer patients, who are receiving highly emetogenic chemotherapy [38, 39]. Intriguingly, a single-blind, randomized, and controlled clinical trial with a total of 142 liver cancer patients enrolled showed that transcutaneous electrical acupoint stimulation (TEAS) significantly improved cisplatin-induced anorexia compared to placebo controls [40]. Therefore, evidence from both experimental studies and clinical trials supports acupuncture and EA as a feasible and effective approach to alleviate CADS.

Pain Related to Cancer and Cancer Treatments

Pain is the most common symptom of cancer and is reported in 90% of cancer patients at various progression stages [41]. Moreover, moderate to severe pain has been claimed in 40% of patients carrying early or intermediate stage cancer and 80% of cancer patients at advanced stages [42, 43]. More importantly, near 70% of cancer pain is undertreated [43].

Acupuncture and EA have been widely employed to relieve non-malignant acute and chronic pain [44]. Recently, acupuncture and EA-induced analgesic effect has been reported in both experimental cancer models and cancer patients. EA at GB30 and ST36 have been reproducibly shown to improve cancer-induced hyperalgesia in the rat bone cancer model by multiple groups [45-47]. EA at Baihui, Quchi, Neiguan, Xuehai, Zusanli, and Sanyinjiao have been shown to alleviate cancer pain in patients with advanced hepatocellular carcinoma [48]. A case report suggested that acupuncture may greatly improve the neuropathic pain induced by bone metastasis in patients with advanced cancer[49]. A recent case report study demonstrated that acupuncture is an effective and safe therapeutic option for reducing cancer pain with minimal side-effects and lowering the need for narcotic analgesics [50]. A randomized controlled clinical trial demonstrated that EA at Jiaji (Ex-B2) from T8 to T12 bilaterally could significantly relieve pancreatic cancer pain [51]. In addition to the analgesic effect on cancer pain, acupuncture and EA were also shown to improve pain caused by cancer treatments, such as surgery and chemotherapy. EA at Neimadian (Extra) and Neiguan (PC 6) have been shown to improve post-operation pain in esophageal cancer patients, who underwent thoracic surgery [52]. A previous study has shown that EA significantly inhibits allodynia and hyperalgesia in an established rat model of paclitaxel-induced peripheral neuropathy [53]. EA has been reported to improve thalidomide- or bortezomib-induced peripheral neuropathy in patients with multiple myeloma [54]. Moreover, a very recent randomized controlled pilot trial demonstrated that acupuncture could significantly improve taxane-induced peripheral neuropathy in breast cancer patients [55]. Therefore, multiple lines of evidence have indicated that acupuncture and EA could serve as complementary therapy to relieve pain that is associated with cancer and cancer treatments.

Xerostomia

Salivary glands are significantly sensitive to radiation therapy and will be irreversibly damaged at doses higher than 50 Gy [56]. It has been reported that more than half of the patients, who received radiation therapy involving major salivary glands, experienced hyposalivation, a symptom also termed radiation-induced xerostomia (RIX), by the end of treatment [56]. RIX is a common and often debilitating adverse effect of radiation therapy among patients with head and neck cancer. A randomized clinical trial found that acupuncture resulted in significantly fewer and less severe RIX symptoms 1 year after the treatment compared to standard care control [57].

Anxiety and Depression

Anxiety and depression are common complications of cancer, influencing cancer patients' quality of life, their adherence to treatment, and their survival [58, 59]. The prevalence rates of anxiety and depression in cancer patients were 19% and 12.9% respectively [60]. The results regarding whether acupuncture could improve cancer-related anxiety and depression are controversial. A clinical trial with 47 enrolled breast cancer patients (23 for real-acupuncture vs. 24 for sham-acupuncture) revealed that acupuncture has no significant effect to improve anxiety and depression associated with the treatment of aromatase inhibitors (AIs) [61]; whereas another clinical trial showed that EA could significantly improve anxiety and depression associated with AIs treatment in breast cancer patients [16]. Meanwhile, a clinical trial including 302 breast cancer patients showed that acupuncture could improve cancer-related anxiety and depression [15]. It is worth noting that, in all three clinical trials above, anxiety and depression are the secondary measurement outcomes. One study, using depression as the primary outcome, illustrated that acupuncture can effectively reduce malignancy-related depression [32]. In summary, large clinical trials assessing anxiety and depression as the primary outcome need to be conducted to evaluate the role of acupuncture in cancer-related anxiety and depression.

Mechanisms Related to the Therapeutic Effects of Acupuncture and EA

Although many efforts have been made to understand the effects of acupuncture and EA in the treatment of cancer-related symptoms and side-effects, the mechanisms by which acupuncture and EA achieve therapeutic benefits remain largely unknown. The main focus has been on investigating the mechanisms of the analgesic effects of acupuncture and EA. In the early 1970s, Han's group, for the first time, strongly suggested the involvement of central chemical mediators in the analgesic effect by acupuncture. They transferred the cerebrospinal fluid of acupunctured donor rabbits into recipient rabbits and achieved analgesic effects in recipients [62]. From then on, a series of studies have demonstrated that the analgesic effects may be attributed to the neurotransmitters induced by acupuncture and EA. For example, naloxone, a specific opioid receptor antagonist, had been shown to partially reverse the analgesic effect of acupuncture on electrical stimulation-induced tooth pulp pain and chronic pain in humans and monkey subjects [63, 64]; poor EA-induced analgesia had been observed in CXBK mice that are deficient with opioid receptors [65]; protection of endogenous opioid peptides by using peptidase inhibitors could potentiate acupuncture analgesia [66, 67]. In addition, some clinical trials have demonstrated that acupuncture and EA could significantly decrease the expression of substance P to relieve pain in patients with fibromyalgia [68], acute herpes zoster [69], knee osteoarthritis [70], and so on. Moreover, EA has been shown to relieve the pain of knee osteoarthritis by enhancing the response of serotonin via the upregulation of serotonin receptor 2A/C [71].

The studies on mechanisms of acupuncture and EA for treating other cancer-related symptoms and side-effects are limited. A previous study has shown that EA can improve chronic fatigue by reducing mitochondrial oxidative stress and increasing ATP synthesis [72]. Acupuncture and EA have been shown to improve insomnia by reducing the sympathetic nervous activity [73], suppressing the activation of the hypothalamic-pituitary-adrenal (HPA) axis [74, 75], increasing the levels of Gamma-aminobutyric acid (GABA) and GABA(A) receptor [76], and elevating the generation and secretion of melatonin [77]. EA at CV12 has been shown to improve CADS via an increase in the secretion of ghrelin and cholecystokinin (CCK) and a decrease in the secretion of 5-hydroxytryptamine (5-HT) into the serum [9, 78]. In addition, chronic EA at ST36 has been shown to improve cisplatin-induced dyspepsia via modulating the production of the vagal and gastrointestinal hormones including fasting ghrelin, glucagon-like peptide-1, and peptide YY [37].

Summary

This review summarized the application of acupuncture and EA in cancer patients for improving cancer-related symptoms and side-effects, such as fatigue, insomnia, chemotherapy-associated dyspepsia syndrome (CADS), radiation-induced xerostomia (RIX), anxiety and depression, and pain (Table 1). We also simply introduced the potential mechanisms involved in the therapeutic effects of acupuncture and EA (Table 2). Given that the actual mechanisms of acupuncture and EA remain largely unknown, more basic and clinical studies are needed to endorse the broad clinical application of acupuncture and EA in the treatment of cancer-related symptoms and side-effects.

Acknowledgements

Funding

This review was by grants from the National Natural Science Foundation of China (31870905 to H Wu, 81673938 and 81874436 to Y Gao, 81903961 to J Le), the Scientific Program of Shanghai Municipal Health Commission (SHWJ2019211 to H Wu), the Shanghai Municipal Education Commission (ZZJKYX19006 to Q-Q Han), the Natural Science Foundation of Shanghai (19ZR1424000 to J Le), the National Natural Science Foundation of China (No. 81830052), Construction Project of Shanghai Key Laboratory of Molecular Imaging (18DZ2260400), Shanghai Municipal Education Commission (Class II Plateau Disciplinary Construction Program of Medical Technology of SUMHS, 2018-2020), the School-level Fund (E3-0200-21-201011-73) and the Hundred Teacher Talent Program of Shanghai University of Medicine and Health Sciences.

Author Contributions

Qiu-Qin Han drafted the manuscript. Yi Fu, Jia-Mei Le and Yu-Jie Ma finished the two Tables. Xin-Dong Wei, Hou-Lin Ji and Haochen Jiang undertook the work of literature search. Hailong Wu and Yueqiu Gao, as the corresponding authors, edited the manuscript. All authors read and approved the final manuscript.

Availability of data and materials

All data generated or analyzed during this study are included in this published article.

Competing Interests

The authors have declared that no competing interest exists.

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Author contact

Corresponding authors: Hailong Wu (E-mail: wuhledu.cn); Yueqiu Gao (E-mail: gaoyueqiucom).

Received 2020-11-12
Accepted 2021-4-27
Published 2021-10-11

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