Lisa V. Doan
Jenny Yoon1
Raven Perez
Jing Wang- 1Department of Anesthesiology, Perioperative Care, and Pain Medicine, NYU Grossman School of Medicine, New York, NY, United States
- 2Department of Neuroscience and Physiology, NYU Grossman School of Medicine, New York, NY, United States
Pain associated with breast cancer is a prevalent problem that negatively affects quality of life. Breast cancer pain is not limited to the disease course itself but is also induced by current therapeutic strategies. This, combined with the increasing number of patients living with breast cancer, make pain management for breast cancer patients an increasingly important area of research. This narrative review presents a summary of pain associated with breast cancer, including pain related to the cancer disease process itself and pain associated with current therapeutic modalities including radiation, chemotherapy, immunotherapy, and surgery. Current pain management techniques, their limitations, and novel analgesic strategies are also discussed.
1. Introduction
1.1. Breast cancer overview
Breast cancer is the most commonly diagnosed cancer, accounting for 29% of newly diagnosed cancers in the United States. It is the second leading cause of cancer death in women in the United States. According to the American Cancer Society, in the year 2023, over 297,000 new cases of female breast cancer and over 43,000 deaths are expected in the United States alone (1). Over the last few decades, the incidence of breast cancer increased and is expected to continue to grow. This is partially explained by improved screening and detection strategies as well as significant growth of an aging population. In the year 2020 alone worldwide, there were 2.3 million new diagnoses and 685,000 deaths (2–5). Current global projections predict that new diagnoses will reach 2.7 million annually with 870,000 deaths by the year 2030 (6).
1.2. Breast cancer pain overview
For patients with breast cancer, the burden of illness includes physical, emotional, and psychological distress. The prevalence of pain among patients with cancer is significant and depends on a variety of factors, including patient demographics, cancer type and extent, and treatment interventions. Pain is strongly associated with patients’ experience of breast cancer, as it is a common consequence related either to the disease pathology itself or to therapies, including both surgical and non-surgical interventions (Table 1) (20).
Table 1. Etiology of pain.
2. Methods
Inclusion criteria for this narrative review includes literature published in the English language between 2000 and the present. Primary literature search was conducted in PubMed and Google Scholar. The following search terms were used:
(“Pain”) and “breast cancer” or “risk factors” or (“chemotherapy” and “breast cancer”) or (“immunotherapy” and “breast cancer”) or (“radiation” and “breast cancer”) or (“Metastases” and “breast cancer”) or (“surgery” and “breast cancer”)
3. Predictors for development of breast cancer pain
Cancer-related pain tends to be associated with a complex interaction of factors including but not limited to disease pathology, genetics, lifestyle influences, and psychosocial stressors. For patients with breast cancer specifically, pain can arise in a variety of ways including symptomatic pain and pain related to cancer therapy. Understanding and identifying risk factors for pain will not only help prevent painful experiences for patients but also guide treatment strategies.
3.1. Patient-related predictors
Patient-specific risk factors for breast cancer pain include not only socio-demographics such as age and education level, but also medical, psychological, and behavioral factors.
3.2. Socio-demographics
Young age is one socio-demographic risk factor associated with breast cancer pain. The correlation between young age and breast cancer pain may be partially due to more advanced local disease at time of diagnosis (21). Other potential factors linking young age and breast cancer pain include changes in pain perception, subjective experiences of pain, differing levels of physical activity, and more invasive therapeutic interventions in younger patients (21). The literature supporting the predictive value of age in breast cancer pain primarily refers to pain related to both surgical and non-surgical treatment, rather than primary pain (17, 22–28).
Low socioeconomic status and low education level are also risk factors for breast cancer pain. Breast cancer patients of lower socioeconomic status in terms of income and net wealth are more likely to report greater chronic pain post-treatment (23, 25, 29). While the predictive value of low socioeconomic status could not be demonstrated over time, studies have shown that breast cancer survivors with lower education levels, defined as less than or including 13 years, are more likely to report chronic pain even 7–9 years post-treatment (25, 30–33).
A meta-analysis of risk factors of pain in breast cancer survivors demonstrated no association in chronic pain development in breast cancer patients with or without children, or patients that were in a relationship or single (30–32).
3.3. Medical comorbidities
As with many cancers, breast cancer on average affects an older population. Due to their age, these patients may experience multiple co-morbidities, including prior or existing pain syndromes. Patients with previous pain comorbidities significantly reported more pain associated with breast cancer treatment compared to patients with no illnesses that previously caused pain (17, 30). These comorbidities included back pain, arthritis or arthrosis, fibromyalgia, and neck pain in addition to frozen shoulder, sciatica, migraine, and systemic lupus erythematous (17, 30).
Diabetes has been linked to breast cancer symptoms as well. One study found that breast cancer survivors with a comorbid diabetes diagnosis had poorer physical function and greater fatigue than their counterparts without diabetes (34). Another found that breast cancer survivors with diabetes were more likely to experience tenderness at surgical sites (35).
3.4. Genetics
Genetics may also play an important role in pain perception for cancer patients. Several genes are involved with the inflammatory pathway that contributes to tumor growth and spread, while the cancer itself can also have perineural involvement and release chemokines and cytokines that result in increased sensitization of peripheral nerve terminals and possibly central neurons as well (36, 37). Specifically, algogenic mediators and pro-inflammatory cytokines including interleukin (IL)-1 and tumor necrosis factor (TNF)-α are known to induce inflammatory pain (38).
Studies have demonstrated associations between variations in cytokine genes and the development of pain in patients with breast cancer. For example, one study demonstrated breast cancer patients who were carriers of a minor allele for IL-receptor-1 (ILR1) had a 53% decrease in odds of reporting pre-operative breast pain (37). This is consistent in mice, where removal of IL1R1 function led to a decrease in inflammation and pain behavior (39). Regarding post-operative breast pain, a particular study outlined three small nuclear polymorphisms (SNPs), IL-6, CXCL-8, and TNF, to be associated with differing breast pain phenotypes after surgery. For example, a rare G allele of IL-6 was associated with decreased serum IL-6 concentrations, preventing the development of mild persistent breast pain after oncologic surgery while a common T allele of CXCL-8 was associated with increased serum CXCL-8 and promotion of mild persistent breast pain after oncologic surgery (38).
3.5. Psychological conditions
The relationship between pain and psychological comorbidity such as depression and anxiety that influence pain perception after breast cancer treatment is well known (17). Patient-related psychiatric and psychological risk predictors such as post-traumatic stress disorder, low mood, and anxiety commonly co-exist and influence development of breast cancer-related pain (40). Pain and depression has been established to have a reciprocal relationship as one complicates the nature and management of the other (41). Additionally, psychological distress, measured by standardized depression and anxiety inventories, was found to be predictive of moderate-to-severe acute and chronic post-surgical breast cancer pain, while psychological robustness regarding emotional and cognitive resilience was found to be protective, albeit temporarily, for recovery trajectory (27, 42). Furthermore, there are several studies focusing on individual distress predictors such as fear and catastrophizing that are strongly correlated with chronic pain (43, 44). Pain-related fear also plays role in predicting pain (45).
3.6. Behavioral factors
Behavioral predictors include lifestyle habits such as obesity, substance use, and physical activity. Studies revealed that people with body mass index (BMI) greater than 30 kg/m2 had 1.33 times higher odds for developing chronic pain related to breast cancer treatment, compared to those with BMI less than 30 (95% CI 1.08–1.67, p = 0.008) (17, 25, 31, 32, 46, 47). This may be explained by obesity being associated with elevated pro-inflammatory cytokines that may correlate with chronic pain and inflammatory states (21). Regarding substance use, alcohol use is associated with a significantly lower chance of chronic pain development (31, 32). Multiple studies reveal that smoking cigarettes is associated with increased persistent breast cancer pain (28, 31). Predictors for lower pain frequency include moderate exercise and non-sedentary activity (28, 46, 48–50). Specifically for breast cancer patients, combined training, which includes aerobic and resistance exercises, successfully reduced pain intensity and improved quality of life (51).
4. Breast cancer-specific factors
4.1. Local vs. metastatic cancer
Localized breast cancer in its early stage does not typically involve pain (Table 1) (52, 53). Pain increases as breast cancer advances (53). Pain can become severe in localized breast cancer depending on the size of the tumor and its involvement with the chest, more specifically the muscles and ribs (53). The larger the tumor, the more physical compression that is exerted on the tissue in its immediate surroundings (53). This can ultimately lead to tissue injury and increased inflammation (52, 53).
While breast cancer is localized to the breast at presentation in 61% of cases, it becomes regionally advanced in 32% and metastatic in 7% of cases (54). Bone is the first metastatic site for up to 40% of breast cancer patients (55–58). Bone metastases are also most associated with inflicting pain in women with metastatic breast cancer (59, 60). Both osteolytic and osteoblastic lesions can result in pain (59). The highly vascularized bone marrow is a source of growth factors and blood vessels, fostering an optimum environment for tumor cell nourishment and growth (59). Breast cancer cells produce molecules similar in structure to parathyroid hormone (PTH), which promote cells that build up or break down bone (59). These parathyroid hormone-related peptides have a strong affinity to bone marrow cells (59, 60). This interaction triggers a destructive symbiotic relationship as an increase in the growth of tumor cells directly aids in the formation of osteoclasts responsible for the dissolution and absorption of bone (59, 60). Osteoclastogenesis triggers more bone resorption, releasing a significant amount of growth factors from the bone matrix that further activate the tumor cells and cyclically exacerbate bone destruction (59). This cycle of bone loss can lead to painful pathological fractures, hypercalcemia and nerve compression (52, 59–61).
In addition to osteolytic features, bone metastases in breast cancer also feature osteoblasts, which synthesize and form bone tissue (59, 61). The cycle of tumor cells causing osteoclasts to degrade bone tissue also results in upregulating osteoblasts to lay down new bone tissue (59, 61). Unfortunately, with advanced metastatic bone cancer, these osteoblasts tend to replace the bone matrix and rebuild bone in random locations (59–61). This random build-up disrupts the balance of the bone microenvironment, as these two osteocytes can work alongside each other on the same bone, with a portion of the bone mostly degraded by osteoclasts and another portion dangerously built up with excessive bone matrix and minerals by the osteoblasts (60, 61). There is less research done regarding the role of osteoblasts in breast cancer metastases, as compared to the role of osteoclasts, which are the main cause of pain related destruction in the bone (60, 61). Both osteolytic and osteoblastic lesions are associated with nociceptive, localized pain that are characterized as deep, sharp, and non-radiating (59, 60).
Two-thirds of patients diagnosed with metastatic cancer have reported symptomatic pain, including neuropathic pain, nociceptive pain, or a combination of the two (62). The humerus is one of the most common sites for breast cancer to spread (56). The pain experienced in the humerus is mainly due to resulting pathological fractures in the absence of trauma (56). Breast cancer metastases also favor trabecular bone due to its large surface area that exposes it to bone marrow and blood flow, making it an ideal microenvironment for tumor-cell invasion and survival (61). Bone metastases are usually located in irregularly shaped bones (61). Other bones where cancer commonly metastasizes to consist of the spine, pelvis, femur, ribs, and skull (61). Tumor cells in the spine are particularly dangerous as they can compress the spinal cord and cause nerve damage and in extreme cases, paralysis (61).
In addition to bones, solid tumors resulting from breast cancer tend to metastasize to the brain, liver, and lungs (53, 61). In rare cases, breast cancer can even metastasize to the urinary tract, peritoneum, or bladder (53, 63). The invasion of malignant tumors in these vital organs can cause mass effect leading to nociceptive pain, as well as painful localized inflammation, tissue and nerve damage, the latter resulting in neuropathic pain (53). For example, metastases to the brain can result in painful headaches (53).
Since advanced breast cancer patients live in a constant state of inflammation, cytokines also play an important role in the experience and mediation of pain (52). Studies that have focused on the connection between breast cancer pain and the amount of cytokines produced in patients have noted that women with more advanced breast cancer have significantly higher quantities of cytokine production, and report higher severities of pain associated with their cancer, as opposed to women with localized breast cancer (52).
5. Treatment-related factors
5.1. Chemotherapy
Chemotherapy results in both survival benefits and reductions in mortality in breast cancer patients (64). However, chemotherapy-induced pain, specifically chemotherapy-induced peripheral neuropathy (CIPN) is a clinically significant side effect of chemotherapy (9). The odds for development of chronic pain in patients treated with chemotherapy are 1.44 times compared to those who did not undergo chemotherapy (95% CI 1.23–1.69, p < 0.00001) (28, 30, 31, 33, 65, 66). Another study found that the prevalence of persistent pain was higher in women who received chemotherapy after surgery than women who did not (14.5% vs. 8.4%, p < 0.01) (65).
Breast cancer chemotherapies most commonly associated with dose-dependent CIPN include platin compounds like cisplatin and carboplatin, as well as taxanes like docetaxel and paclitaxel (67–69). CIPN is often sensory in the early process with patients reporting tinging and numbness of the feet or fingers (67–69). Additional sensory symptoms include ataxia and gait disorders of the lower extremities, as well as painful sensations including paresthesia, dysesthesia, tingling, itching, burning, tight, stabbing, and aching (67). Several factors that predispose to peripheral neuropathy due to chemotherapy include diabetes mellitus, alcohol use, inherited neuropathy, preexisting neuropathy, age-related axonal loss, and prior chemotherapy (67, 70). Generally, non-severe taxane-induced peripheral neuropathy improves significantly after discontinuation of the treatment (71). Unfortunately, a prospective trial of patients with high-risk breast cancer found that 44.8% of patients treated with docetaxel met diagnostic criteria for CIPN one year after treatment (8). Another meta-analysis revealed CIPN prevalence at 68.1% within the first month of treatment, 60.0% at three months, and 30.0% at six months of treatment (8).
Taxane acute pain syndrome (TAPS) is chemotherapy-induced pain due to taxane chemotherapy with an unreliable incidence between 2.8% and 72% in breast cancer patients, perhaps due to the underestimation and inconsistent definition of the phenomenon (10–12). Despite this, TAPS is described as diffuse, nonlocalized arthralgia and myalgia, and multiple studies have found that it is at its maximum at around three days of treatment with decline of pain after around five to seven days (9–12). TAPS incidence may also depend on the dosing and frequency of chemotherapy. One study found that 26% of patients with docetaxel-induced myalgia and arthralgia required a dose reduction from the initial dose of 100 mg/m2 (72). Other studies have found that TAPS incidence was also higher in patients receiving three weekly treatments of paclitaxel compared to patients receiving one weekly treatment (73–75).
In addition to direct neurotoxic damage, chemotherapy can also result in the adverse effect of impaired muscle function, weakness, and wasting (76, 77). Breast cancer patients undergoing chemotherapy specifically were found to have worse muscle function compared to healthy noncancer peers (76, 77). A systematic study revealed that early-stage breast cancer patients lost 1.3 kg lean body mass and continued to lose body mass during and after adjuvant chemotherapy (78). Compounded with worse muscle function, breast cancer patients may continue to experience joint and muscle pain that significantly affects their quality of life even years after completion of chemotherapy (69).
5.2. Immunotherapy
While breast cancer was once thought to be immunologically quiescent, recent findings supporting the immunogenicity of breast cancer have led to expansion of the use and study of immunotherapy as a viable breast cancer treatment (79). To date, the most established form of immunotherapy is the application of monoclonal antibodies. Monoclonal antibodies can treat breast cancer through direct elimination of tumor cells, activation of the immune cells to target tumor cells, or vascular disruption (80). Despite the demonstrated efficacy of monoclonal antibody treatment in reducing breast cancer recurrence and mortality, however, this therapeutic avenue may result in infusion- and inflammation-associated pain. Trastuzumab, a HER2 targeting recombinant monoclonal antibody, is among the first of targeted therapies for breast cancer and is now considered standard care for HER2-positive breast cancer patients (81). While generally well-tolerated, multiple clinical trials have found that patients may experience flu-like symptoms during and immediately after Trastuzumab infusion (82, 83). These symptoms, which can include headache, fever, shortness of breath, or nausea, are described as mild-to-moderate in severity, beginning during infusion and declining in severity in the days following infusion (84).
Immune checkpoint inhibitors (ICI) represent a rapidly developing subset of monoclonal antibodies. The research surrounding checkpoint inhibitors is promising, with one phase III trial demonstrating that atezolizumab, a PD-L1 targeting checkpoint inhibitor, increased both progress free survival and overall survival outcomes in untreated triple negative breast cancer patients (85). In addition to the infusion-related flu-like symptoms, clinical trials investigating checkpoint inhibitors for breast cancer have determined that this treatment is associated with arthralgia, fatigue, and skin toxicities, which may result in pain for patients (86). In regard to severity, most ICI-related adverse events are manageable with steroids and immunosuppressants, largely mitigating the need for dose-reduction (87). However, it is important to note that immunotherapy such as ICI inhibitors are often used in conjunction with chemotherapy for best results (80). This should be considered when assessing immunotherapy-associated pain.
Other potential avenues of breast cancer immunotherapies include therapeutic vaccines and oncolytic viruses. Because of their novelty, the research remains investigational and there is a dearth of research focusing on pain, especially in the long-term, that is associated with these therapies. In general, however, dendritic cell vaccines have been shown to be well-tolerated by patients (88, 89).
Despite these promising findings, one area of concern regarding immunotherapy is the possibility of psychological and neurological side effects, which can increase pain perception. For example, it has been shown that up to 10% of patients taking Trastuzumab develop depression (90). Furthermore, although not common, autoimmune encephalitis has been noted by multiple studies as an ICI-associated adverse effect (91, 92). Because both depression and neuroinflammation have been shown to exacerbate perceptions of pain, these adverse effects of immunotherapy should be further studied (93, 94).
5.3. Radiotherapy
Adjuvant radiation therapy improves survival rates and decreases risk of recurrence in patients with breast cancer. Despite this, radiation therapy is associated with acute and chronic side effects including fatigue, edema, skin fibrosis, and pain (95, 96). These symptoms depend on the irradiated volume and intensity of treatment but may have considerable impact on the potential development of neurotoxicity and neuropathic pain (95, 96).
Multiple studies demonstrate that adjuvant radiotherapy significantly increased the risk of patients reporting pain up to 1.5 times (24, 97). According to a recent study, 24%–47% of patients with breast cancer reported persistent pain of the irradiated area after radiotherapy completion (14). A prospective study demonstrated that pain related to breast radiotherapy peaked at 1-week following radiotherapy treatment regardless of dose or extent of the irradiated region. Additionally, patients younger than 59 years of age experienced more acute breast pain following radiation than patients over 60 years of age (14). The combination of both chemotherapy and radiotherapy is significantly associated with higher risk of breast cancer survivors reporting pain (30).
Radiation-induced brachial plexus neuropathy (RIBPN) is a peripheral neuropathic condition that can occur in breast cancer patients treated with radiation therapy to the chest wall, neck, or axilla, and can occur at variable times between six months to twenty years after radiation (98). While symptoms commonly initially present with paresthesia and pain, often the pain persists simultaneously as motor weakness and eventually, upper limb paralysis can occur (98). Another common source of pain after radiotherapy treatment is radiation dermatitis, a skin reaction of the irradiated area that occurs in up to 95% of patients (15). It consistently peaks around two weeks after radiotherapy, and can manifest in a variety of symptoms including erythema, edema, desquamation, and pain (99). A prospective study demonstrated that both overall pain and breast pain peaked after one week of radiotherapy, regardless of the radiotherapy dosage, fractionation, or extent of irradiated region. This may be attributed to the development of acute radiation dermatitis of the breast or chest wall closely following radiotherapy (14).
5.4. Endocrine/hormonal therapy
While neoadjuvant chemotherapy and radiotherapy has proven efficacious and become a standard of care in breast cancer treatment, endocrine therapy is also gaining traction in cancer therapies, demonstrating efficacy, high tolerability, and good compliance (100). Hormonal agents like tamoxifen and aromatase inhibitors do not seem to cause neuropathy (101, 102). However, multiple studies demonstrate that the use of hormone therapy is an independent predictor to long-term pain. These studies have postulated that musculoskeletal adverse effects related to the use of aromatase inhibitors or the increased incidence of breast fibrosis with the use of tamoxifen may be responsible for development of pain (69, 103–105). While the exact mechanism of hormone therapy-induced arthralgia is unknown, the sudden decrease in estrogen due to aromatase inhibition may be a possible hypothesis, as similar arthralgia is prevalent in peri- and post-menopausal women (106, 107). For aromatase inhibitor use, risk factors for the development of arthralgia include younger age, adjuvant chemotherapy, use of granulocyte colony-stimulating factor, and prior history of arthralgia, arthritis, or fibromyalgia. On the other hand, studies have demonstrated that at least half of patients experienced resolution of arthralgia around 6-months from onset of aromatase inhibitor therapy (106, 108). For tamoxifen use, patient are less likely to experience joint symptoms compared to aromatase inhibitor use. A study demonstrated that 75% of patients experiencing joint symptoms from aromatase inhibitor use transitioned to tamoxifen and obtained relief in symptoms (109).
Duloxetine has been studied in regards to reducing the pain associated with aromatase inhibitor use. Duloxetine is a serotonin noradrenalin reuptake inhibitor, and it enhances signaling through both serotonin and noradrenergic systems (110). It has been used widely for a range of neuropathic pain conditions including fibromyalgia, diabetic neuropathy, and trigeminal neuralgia (110–112). One study demonstrated that duloxetine relieved joint and musculoskeletal pain in breast cancer patients undergoing aromatase inhibitor therapy (113). A 2022 meta-analysis, however, found that the efficacy of duloxetine was similar to that of placebo (114).
In addition, some studies illustrate that endocrine therapies demonstrated an increased risk for more frequent pain, specifically in post-menopausal women who underwent surgical treatment (31).
5.5. Breast surgery
Surgical intervention for breast cancer treatment includes resection of the entire breast in a simple or radical mastectomy, or a partial mastectomy with or without surgical management of the axillary lymph nodes. Currently, advances in surgical treatment and efforts to reduce risk of recurrence strongly guides the increased use of mastectomy treatment (115, 116). Up to 60% of breast cancer survivors report persistent postsurgical pain, inevitably leading to reduced quality of life, impaired functionality, and need for therapeutic interventions (17–19). Post-surgical pain can be organized into acute and chronic pain with varying risk factors and symptoms.
Acute post-operative pain describes pain after surgical intervention within two weeks. The most consistent surgical risk factors associated with acute post-operative pain include axillary dissection and reconstruction, which are associated with 3–4-fold increased risk of moderate-severe pain and opioid use two weeks post-surgery (117–120). Additionally, longer duration of surgery and higher pain catastrophizing scores were found to be associated with increased severity of acute pain (121). The incidence of acute post-operative pain after breast cancer surgery is estimated to be between 61% and 67% (122). The underlying mechanism of acute post-mastectomy pain is likely caused by direct damage to tissue complicated by short-term, self-limited inflammatory changes at the surgical site (123). There may also be a component of tolerance or hyperalgesia in patients who are treated with short-acting opioid medications in the perioperative period (124). As such, there is a need to explore non-opioid management for acute post-operative pain because without treatment, there is high likelihood to progress to chronic post-operative pain.
Chronic pain induced by breast cancer surgery is termed post-mastectomy pain syndrome (PMPS), and it can involve phantom breast pain, intercostobrachial neuralgia, neuroma pain, or pain from nerve injury (53). In particular, mastectomies have a strong association with PMPS which is defined as pain that lasts at least three months after surgical intervention (125). Currently, the standard perioperative multimodal analgesia is modestly effective in PMPS prevention (126).
Numerous studies have explored the association with breast cancer surgery and chronic post-surgical pain (CPSP). The prevalence of CPSP in general is approximately 10% after all surgeries, with high intensity acute post-surgical pain being the strongest predictor for developing CPSP (127, 128). Regarding patients being treated for breast cancer, a study evaluating persistent pain following surgery, radiotherapy, and chemotherapy found that the greatest pain prevalence rate was in the post-surgery group (129). A large nationwide study demonstrated 58% of women experienced sensory disturbances in the surgical region even 1–3 years after surgery (24). Furthermore, a systematic review of observational studies reported an estimated median prevalence of persistent pain after breast cancer surgery at 37.5% at a median follow-up of 24 months (IQR 30%–51%) (97). A separate survey determined that 53% of breast cancer survivors suffered moderate-to-severe chronic pain after surgery and 18% suffered from severe chronic pain two years after surgery (24). The development of persistent pain after surgery involves a variety of mechanisms including direct tissue injury during surgery and inflammatory processes from surrounding tissue trauma. Postoperative healing can also result in inflammation, neuromas, and increased sensitivity due to nerves becoming entrapped in healing incisions (18, 130, 131). Meta-analyses demonstrated that patients with lymphedema after surgery were at 2.58 times higher odds of developing chronic pain than patients without lymphedema (28, 30, 33, 66).
5.6. Axillary surgery
A strong predictor of chronic pain after breast cancer surgery is axillary lymph node dissection (17, 97). The complex structure of the axillary region contributes to higher prevalence of chronic pain in patients with surgery in this area (132). A study demonstrated that axillary lymph node dissection was associated with a statistically significant increase of 1.77 times likelihood of pain compared with sentinel lymph node dissection, as well as significantly increased 4.97 times likelihood for sensory disturbances (24). Notably, the lateral cutaneous branch of the second intercostal nerve crosses the axilla and innervates the medial arm, and is the most commonly injured nerve during mastectomy surgeries, especially with axillary lymph node dissection (133). Axillary lymph node dissection was associated with 21% increase in the absolute increase in risk of chronic pain. Despite the risk of CPSP, the risks of omitting axillary surgery are also significant and include undertreating and reducing survival in breast cancer patients, as these dissections are confirmed methods to remove cancerous tissue and stage breast cancer accurately (97). Additional co-morbidities from axillary surgeries besides pain include reduced shoulder range of motion, upper extremity and hand weakness, lymphedema, and numbness (17, 134).
Compared with axillary lymph node dissections, sentinel lymph node biopsies are associated with fewer upper limb morbidities and no significant difference in survival (134, 135). Among the complications among breast cancer patients undergoing sentinel lymph node biopsies, sensory disorders were found to be the most common followed by pain (135). Patients with breast cancer undergoing sentinel lymph node biopsies are reported to have statistically significantly less pain, numbness, and shoulder movement restrictions at six months after surgery (136).
6. Breast cancer pain management
The World Health Organization (WHO) proposed an analgesic ladder in 1986 to guide pain treatment for cancer patients (137). While this guideline has undergone modifications throughout the years, it provides a simple structure for managing pain, reducing morbidity caused by pain in 70%–80% of patients (138). According to this analgesic ladder, cancer pain treatment should follow a sequential order from non-opioid drugs to weak opioids for mild-to-moderate pain to strong opioids for moderate-to-severe pain (137). Additionally, adjuvant medications such as tricyclic antidepressants, anti-convulsants, and corticosteroids may be utilized for different types of pain (53, 139). However, limitations to pharmacotherapy remain, as patients may develop unwanted side effects and even a ceiling effect often due to dose-limiting side-effects after chronic use (137).
As previously discussed, pain is usually not a symptom of breast cancer unless the cancer develops into its later stages. More often, patients report pain post-intervention. In this section, we will discuss pain management guidelines for specific causes of breast cancer pain (Table 2).
Table 2. Treatment of breast cancer pain.
6.1. Metastatic pain management
As advanced breast cancer often involve metastasis to the bone, it is important to consider treatment of bone pain and skeletal-related events including fractures and future orthopedic intervention (152). Often, management includes analgesics medications including both opioid and non-opioid options, bone-targeted medications including osteoclast inhibitors, and adjuvants including corticosteroids and anti-convulsants (153). For patients with painful bony metastases that is difficult to manage pharmacologically, WHO guidelines recommend palliative radiation treatment, including both single and fractionated radiotherapy (140, 154). Massage therapy has also shown to be effective in relieving pain for patients with metastatic bone pain (142). Ultimately, however, opioids remain the first-line standard of care for palliative management of breast cancer pain (155).
6.2. Chemotherapy or radiotherapy pain management
Chemotherapy that prolongs survival in breast cancer patients often induce neurotoxic side effects including pain which is believed to be primarily affecting peripheral sensory nerves. Administration of fingolimod, a FTY720 pro-drug, has been demonstrated to enhance the chemotherapy benefits when treating triple negative breast cancer while also suppressing CIPN (156). In a double-blind, placebo-controlled trial of 206 breast cancer patients, those who received ganglioside-monosialic acid (GM1) also experienced less chemotherapy-induced peripheral neuropathic pain than counterparts receiving a placebo treatment (26.4% vs. 97.8%, P < 0.001) (157). Furthermore, neuropathic agents such as gabapentin and pregabalin have been studied in clinical trials as potential avenues for CIPN treatment. Gabapentin and pregabalin inhibit the alpha(2)delta-1subunit of voltage-gated calcium channels presynaptically at the first synapse of the primary sensory neurons in thedorsal horn of the spinal cord, which are known to be upregulated in nerve injuries (158). Clinically, studies investigating the efficacy of gabapentanoids seem to have mixed results, with some studies suggesting that gabapentanoids may decrease chemotherapy-induced myalgias in breast cancer patients, but more recent studies fail to support these findings (159–161).
In regards to non-pharmacological agents, therapeutic massage has been shown to reduce pain ratings and NSAID use as well as improve relaxation, mood disturbances, and fatigue in patients receiving cancer chemotherapy (144). Meta-analyses have demonstrated that acupuncture is not effective for chemotherapy or radiation-induced pain (151). Finally, a 2021 meta-analysis found that exercise improves CIPN symptoms (143).
6.3. Surgical pain management
Several options are commonly utilized in practice for management of surgical pain, including pharmacologic and interventional regional techniques (Table 3).
Table 3. Recent trials of therapies for breast cancer pain.
For treatment of acute surgical pain, standard regimen includes nonsteroidal anti-inflammatory drugs (NSAIDs), acetaminophen, and opioids. Systemic dexamethasone has also been demonstrated to positively impact post-operative pain, nausea, and vomiting in patients who underwent lumpectomy and mastectomy procedures (145, 146). An induction of 0.25 mg/kg followed by an IV infusion of 2–10 mcg/kg/min of ketamine administered intraoperatively has also been effective in significantly reducing the incidence of acute post-operative pain in comparison to intraoperative opioids used during breast cancer surgery (147).
Local nerve blocks represent another mode of anesthesia commonly used in breast surgeries. Multiple studies have demonstrated their ability to reduce acute post-surgical pain (148, 168, 169). In addition to acute pain, local nerve blocks have been shown to have some ability to mitigate longer-lasting post-operative pain as well, with results ranging from a few months to a year (148, 149). One study also found that receiving a paravertebral nerve block lowered average doses of narcotics taken by mastectomy patients over a six-month post-operative period (170). While there are several types of local nerve blocks, comparative studies have found that paravertebral nerve blocks seem to be the most impactful in terms of analgesia efficacy and duration (162, 163).
Studies have also evaluated the efficacy of postoperative analgesics for pain control after oncologic breast surgery. One study revealed that postoperative COX-2 inhibitors in conjunction with paravertebral neve blocks decreased pain intensity with activity on post-op day five but demonstrated no effect on postoperative hyperalgesia (164). Ultimately, there is significant variation in pain management strategies after breast surgery and often involves multimodal approach including regional nerve blocks, narcotics, and non-opioid medication use (171). Meta-analysis has also demonstrated that acupuncture is effective for surgery-induced pain (151).
Furthermore, some studies have demonstrated the efficacy of pre-operative gabapentin and pregabalin for the treatment of acute and chronic post-surgical pain after breast cancer surgery in terms of both reduced pain scores and opioid use in the post-operative recovery area (150). However, there is limited literature to substantiate these findings, and further investigation is necessary to confirm the efficacy of pre-emptive analgesic therapies.
Efforts are being made to establish interventions that decrease the risk of PMPS as well. For example, cryotherapy is being studied as a well-tolerated intervention that may prevent post-mastectomy chronic pain (165). A recent randomized control trial treated 31 participants undergoing mastectomy with an ultrasound-guided percutaneous cryoneurolysis procedure and 29 participants with a sham procedure (165). On post-operative day 2, these participants had a median pain score of 0, significantly lower than the median pain score of 3.0 for their sham-procedure counterparts [difference −2.5 (97.5% CI, −3.5 to −1.5)] (165). This improved analgesia lasted throughout a year, with chronic pain developing in 3% of cryoneurolysis participants compared to 17% of sham participants at the one-year checkpoint (165).
The literature for management of PMPS is not as extensive as that for acute post-operative pain. Currently, the management of PMPS is multidisciplinary (172). Randomized clinical trial results support the potential of medical management of PMPS including pregabalin or venlafaxine, which have been demonstrated to result in significant reductions in pain (166, 173). For pain intractable to such pharmacologic interventions, one study has shown that pulsed radiofrequency of the stellate ganglion can successfully reduce neuropathic pain intensity and increase functional improvement for up to 6 months (167). Ultrasound-guided peripheral nerve blocks have also been described for treatment of PMPS (149). Furthermore, there are situations in which surgical interventions are warranted, particularly in the case of peripheral nerve injury. A retrospective study found that 16.5 months after intercostal nerve resection and implantation, 6 of the 10 patients self-reported excellent results, and an additional patient reported good results (174).
7. Discussion
Breast cancer pain is multifactorial (Table 1). Pain can come from the cancer itself and may arise from treatment-related factors. Pain is also influenced by patient-specific factors, such as socioeconomic factors, psychological factors, and medical comorbidities. Though recent clinical trials have focused their efforts on the reduction and relief of acute postoperative pain, as well as chemo-, radio-, and hormonal therapy induced pain, treatment of cancer-related pain often relies on opioids, and there is need for further study of effective and safe pain therapies.
Pain management research needs to include interventions for the prevention of PMPS, for established PMPS, and other chronic pain caused by breast cancer treatments. The authors are currently studying perioperative ketamine for the prevention of PMPS (NCT05037123), hypothesizing that by targeting acute postoperative pain and mood, the severity and incidence of PMPS will be decreased, overall reducing the use of long-term opioid use, as well as reducing the risk of chronic postoperative pain in women with breast cancer.
Author contributions
LD and JW contributed to conception and design of the manuscript. All authors contributed to writing of the manuscript. All authors contributed to the article and approved the submitted version.
Funding
This work was supported by the Department of Anesthesiology, Perioperative Care, and Pain Medicine and the Interdisciplinary Pain Research Program of the NYU Grossman School of Medicine.
Conflict of interest
The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
Publisher's note
All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article, or claim that may be made by its manufacturer, is not guaranteed or endorsed by the publisher.
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Keywords: breast cancer, cancer pain, pain management, post-surgical pain, neuropathy
Citation: Doan LV, Yoon J, Chun J, Perez R and Wang J (2023) Pain associated with breast cancer: etiologies and therapies. Front. Pain Res. 4:1182488. doi: 10.3389/fpain.2023.1182488
Received: 8 May 2023; Accepted: 27 November 2023;
Published: 11 December 2023.
Edited by:
Salahadin Abdi, University of Texas MD Anderson Cancer Center, United StatesReviewed by:
Juan M. Jimenez Andrade, Universidad Autónoma de Tamaulipas, MexicoMaree Therese Smith, The University of Queensland, Australia
© 2023 Doan, Yoon, Chun, Perez and Wang. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
*Correspondence: Lisa Doan bGlzYS5kb2FuQG55dWxhbmdvbmUub3Jn Jing Wang amluZy53YW5nMkBueXVsYW5nb25lLm9yZw==