1. Introduction
Lymphoedema is a chronic disease characterised by asymmetrical tissue swelling due to the accumulation of protein-rich fluid following insufficient lymphatic drainage [
1]. Often underestimated, lymphoedema carries potentially debilitating consequences of symptoms comprising swelling, heaviness, firmness, pain, impaired limb mobility, and fibrotic skin changes [
2]. These symptoms can impede daily function and adversely affect recreational and social relationships, resulting in a decreased overall health-related quality of life (HRQoL) [
3]. Studies suggest that 15.5% of breast, genitourinary, gynaecological and melanoma cancer survivors suffer from symptomatic persistent lymphoedema [
4].
Axillary lymph node dissection (ALND) has been identified as the leading cause of upper limb lymphoedema [
1,
5,
6]. However, it remains a crucial part of the treatment regimen for early operable breast cancer and melanoma with positive sentinel node or regional metastases [
7,
8]. A meta-analysis by DiSipio et al. showed the pooled incidence of lymphoedema after ALND for breast cancer to be 19.9%, compared to 5.6% for sentinel lymph node biopsy [
1]. Most cases of lymphoedema occur within the first 12 months following ALND, with 75% of patients being diagnosed within three years of surgery [
5]. Despite the increasing evidence of ALND as a significant risk factor for lymphoedema, a limited number of studies have explored its potentially serious impact on HRQoL.
The primary objectives of this study were to (i) identify the prevalence of upper limb lymphoedema following ALND and (ii) assess the impact of lymphoedema on patient HRQoL.
3. Discussion
Our findings demonstrate a 45% prevalence rate of clinically diagnosed lymphoedema in patients who underwent ALND. This rate increases to 58% when patients who reported a prior diagnosis of lymphoedema before our study commenced are included. This prevalence is much higher than the conservative estimates of 19.9% [
1]. This could be explained by the presence of many risk factors in our cohort. More extensive surgery (ALND vs. sentinel lymph node biopsy, number of lymph nodes involved, and having a mastectomy) is well-established as a strong risk factor for the development of lymphoedema [
1,
5,
6]. Our results showed that the number of lymph nodes removed and undergoing mastectomy were positively associated with the clinical diagnosis of lymphoedema. Indeed, 65.8% of our patients underwent mastectomy as their primary surgery. A high BMI is also a strong predictor of the development of lymphoedema after ALND [
1,
9], which was positively associated with a clinical diagnosis of lymphoedema. The mean BMI for our study cohort was 27.9. Additionally, most of our patients (84%) received radiotherapy, which is a moderate risk factor for the development of lymphoedema [
1,
5]. However, our findings did not show a statistically significant association between radiotherapy or chemotherapy with lymphoedema diagnosis. As for other variables, age, diabetes, cardiovascular and respiratory conditions, depression/anxiety, smoking, reconstruction, breast cancer grade and subtype, were not associated with the prevalence of lymphoedema. This was consistent with a systematic review that found low evidence for age as a risk factor for the development of lymphoedema [
10]. A study by Miller et al. [
11] suggested that immediate implant reconstruction significantly reduces the risk of lymphoedema, but this was not demonstrated in our study noting the limited sample size from available data.
A standardised HRQoL instrument for lymphoedema is vital to assess its long-term impact on patients, while taking into consideration physical, psychological, social and spiritual aspects of quality of life [
12]. Currently, there are eight validated lymphoedema-specific HRQoL tools available. Of the eight questionnaires, LYMQOL [
13] is the most cited questionnaire with good psychometric properties and was therefore adopted for this study. It is however important to note that LYMQOL has widely been used to monitor changes in quality of life in patients undergoing treatment, whereas in our study, LYMQOL was used to provide a static score to assess their current QoL. As such, we recruited 35 healthy subjects to complete the questionnaire as a baseline control to analyse if there is a significant difference in HRQoL in our study cohort.
In our LYMQOL assessment, the LE group reported suboptimal scores in the appearance domain compared to the non-LE group. Previous studies have suggested that the appearance of a swollen limb can contribute to psychological distress [
14]. However, no statistically significant differences between the LE group and the non-LE group were observed across other LYMQOL domains or overall QoL scores, despite the LE group reporting worse scores. The LE group reported significantly worse scores in all domains of LYMQOL when compared to the control group, though there was no significant difference in overall QoL. These findings do not provide sufficient evidence to conclude that lymphoedema has adverse impacts on HRQoL at a statistically significant level. Instead, our findings suggest the vulnerability of patients who underwent ALND as part of treatment for breast or cutaneous malignancies compared to the general population.
Our study also yielded inconclusive evidence to support the increased prevalence of anxiety or depression in patients with lymphoedema. Nevertheless, 32.9% of our patient cohort reported a prior diagnosis of anxiety and/or depression. This prevalence is much higher than the general population’s prevalence of 1.9% for depression and 3.8% for anxiety in our geographic area, as reported by a systematic review that accounted for the effects of the COVID-19 pandemic [
15].
In our questionnaire, we invited our patients to share their experiences regarding their follow-up post-ALND and report any previous treatment for lymphoedema received. Unfortunately, many patients expressed a negative perception of feeling ‘forgotten’ after axillary clearance surgery and being left alone to find external services to manage their lymphoedema. In total, 22% of patients were already self-funding lymphoedema treatment through a private therapist, and those who had undergone treatment reported worse LYMQOL scores for appearance and symptoms than those who had not. Our results do not support the general findings of other studies that have demonstrated an improvement in QoL following lymphoedema treatment [
16]. This discrepancy may indicate insufficient follow-up under the government-funded system, variations in treatment protocols, or potential selection bias in our study population resulting from voluntary participation. As expected, clinical diagnosis of lymphoedema was positively associated with treatment for lymphoedema.
Of note, five patients without clinical or prior diagnosis of lymphoedema were undergoing treatment for lymphoedema. There is conflicting evidence of the use of compression garments for the prevention of lymphoedema in the literature. A randomised controlled trial (RCT) by Ochalek et al. showed that the use of compression garments in the first two years after surgery reduced the incidence of lymphoedema [
17], which was supported by a separate RCT by Paramanadam et al. suggesting that prophylactic use of compression sleeves in the first year after surgery reduced and delayed the occurrence of lymphoedema in women who underwent ALND for breast cancer [
18]. In contrast, a recent RCT by Bundred et al. demonstrated that early intervention with external compression garments does not prevent lymphoedema [
19]. The pathogenesis of lymphoedema is characterised by the process of inflammation, fibroadipose deposition, impaired lymphangiogenesis and dysfunctional lymphatic pumping [
20], and one could argue that the use of compression garments may mask the symptoms of arm swelling rather than interfere with the immunologic process. In support of this idea, skin infections were shown to increase the risk of lymphoedema, but precautionary measures such as preferential avoidance of ipsilateral venepuncture, injection or blood pressure measurements, or the use of compression garments during air travel were shown not to be associated with lymphoedema development [
21,
22]. What seems clear, however, is that exercise and weight loss have a strong benefit in the prevention of lymphoedema [
23,
24], which is suggested to be partly a result of changes in body composition or decreased subcutaneous tissue inflammation [
20]. The current standard of care for prevention involves minimising axillary interventions, avoiding weight gain with a healthy diet and exercise, and avoiding infection with skin and nail care [
25].
In a typical assessment to screen for lymphoedema, upper-extremity volume estimates are obtained through bilateral circumferential measurements and perometry, and signs and symptoms report of limb heaviness and swelling are used. In our study, bilateral upper limb circumference measurement was used due to its efficiency and convenience for routine clinical use [
26], as well as to avoid confounding effects from patient-reported outcome measures that are already covered by LYMQOL. However, the use of upper limb circumference measurements to diagnose lymphoedema has its own limitations, including the risk of overestimating the prevalence of lymphoedema [
27] and inter-rater disparities. The latter concern was addressed by having only three members of the research team perform the measurements, all of whom received the same training to ensure consistent techniques were applied for each participant. Other objective diagnostic tools include water displacement, perometry, bioimpedance spectroscopy, lymphoscintigraphy, 3D laser scanning, CT, MR lymphangiography and indocyanine green (ICG) lymphography [
28]. Of these, ICG lymphography is a relatively newer modality that can identify early lymphatic obstruction and grade the severity of lymphoedema. ICG lymphography involves laser-assisted near-infrared angiography with ICG as a fluorescent marker to visualise lymphatic flow [
29] and assess the patency of the lymphatic system [
30,
31]. A well-cited systematic review by McLaughlin et al. recommends screening every 6–12 months for a minimum of 2–3 years [
32]. The high prevalence of lymphoedema warrants routine lymphoedema screening in patients undergoing ALND, but its cost-effectiveness and clinical utility must be considered. We suggest that the simplicity and accessibility of the circumference measurement can serve as a preliminary screening tool to provide an indication for the use of more reliable and comprehensive diagnostic tools for correlation.
There are several limitations to our study. Firstly, participation was voluntary, potentially resulting in selection bias as those who agreed to participate may have been more likely to have experienced symptoms of lymphoedema. The recruitment of only 73 out of 344 potential candidates also represents a relatively small sample size. Additionally, measurements were taken at different times post-surgery and only once, rather than through periodic follow-ups. Importantly, the treatment itself adds a major bias, as it may be a factor that improves QoL or indicates a worse condition from the first place, as evidenced by the treated group having poorer scores in certain LYMQOL domains than the group without treatment. A prospective enrolment of all patients undergoing ALND with bilateral upper limb circumference screening may provide a more accurate prevalence of lymphoedema and a comparison of quality of life between those with and without lymphoedema.
As a retrospective cohort study, our findings suggest that upper limb lymphoedema remains a significant risk in patients undergoing ALND for breast cancer and other cutaneous malignancies, but its potentially negative impacts on quality of life are not demonstrated in the context of the limitations discussed. In view of this, routine screening should be incorporated into standard post-ALND follow-up protocols in order to facilitate early intervention due to its high prevalence. A prospective cohort study can further address how each of the risk factors affects the prevalence of lympheodema, and routine HRQoL surveys such as LYMQOL can be used to track the effect of treatment and provide additional insight into the health burden experienced by lymphoedema patients.