Acupuncture for palliative cancer pain management: systematic review

Cancer-related pain represents one of the most frequent and distressing symptoms faced by oncology patients, affecting more than half of all cases and two-thirds of those with advanced disease. This discomfort extends far beyond physical sensation, deeply interfering with daily activities, sleep, social relationships, and the cognitive capacity of patients. With population aging and lifestyle changes, the number of people with cancer is projected to exceed 20 million by 2026, making effective pain management an increasingly urgent public health priority.

Cancer pain treatment traditionally relies on opioid medications, but about two-thirds of patients still report inadequate relief or experience significant side effects such as nausea, constipation, and drowsiness. Between 10% and 20% of individuals cannot tolerate these medications, requiring alternative approaches. In addition, there is growing concern about the risk of dependence and patient reluctance to use these medications, even when clinically indicated. These factors highlight the need for safe and effective complementary therapies that can be integrated into palliative care.

This study aimed to critically analyze the available evidence on the use of acupuncture in pain management for cancer patients in palliative care. The researchers conducted a comprehensive systematic review, searching multiple medical databases from inception through October 2020. Only studies involving adults with cancer diagnosis who received acupuncture in a palliative care setting were included, with pain assessment using validated instruments. The rigorous methodology included independent selection by two reviewers and evaluation of evidence quality according to internationally recognized criteria.

The analysis revealed only five studies that met the established criteria, totaling 189 participants. The studies were conducted between 1999 and 2019 in countries such as the United States, United Kingdom, and Canada, with sample sizes ranging from 20 to 68 patients. The acupuncture techniques used were diverse, including traditional needle acupuncture, electroacupuncture, percutaneous electrical stimulation, and auricular acupuncture. All studies reported favorable effects of acupuncture in pain relief, with the majority of works reporting no significant adverse events.

When mentioned, side effects were minimal, such as leg stiffness or temporary drowsiness, which resolved spontaneously.

For patients and their families, these results suggest that acupuncture may offer a promising and safe therapeutic option as a complement to conventional treatments for cancer pain. The technique may be especially valuable for those who experience intolerable side effects from medications or wish to reduce their dependence on opioids. For healthcare professionals, the findings indicate that acupuncture may be considered as part of a multidisciplinary approach in palliative care, potentially improving patients' quality of life and offering an additional tool in the therapeutic arsenal.

However, it is crucial to acknowledge the important limitations of this study. The methodological quality of the studies analyzed was considered low to moderate by rigorous scientific criteria, with only one study reaching a more robust level of evidence. The small number of participants and the variety of acupuncture techniques used make definitive conclusions about efficacy and optimal treatment protocols difficult. In addition, the scarcity of studies specifically focused on palliative care reveals an important gap in the medical literature that needs to be filled.

The authors emphasize that, although the results are encouraging, higher-quality studies with larger samples and more rigorous designs are needed to definitively establish the role of acupuncture in palliative oncology care. They also acknowledge the inherent challenges of conducting research in this context, including recruitment difficulties, high dropout rates, and ethical issues specific to working with patients in palliative care. Even with these limitations, this review represents an important first step in understanding the potential of acupuncture in this specific clinical setting, offering hope for a more integrated and humanized approach to caring for cancer patients.