Background
Breast cancer is the most commonly diagnosed cancer and the leading cause of cancer death in women around the world [
1]. According to global data, there were approximately 2.1 million newly diagnosed breast cancer cases in 2018, accounting for almost one in four cancer cases among women and 626,679 breast cancer deaths [
2]. Although significant progress has been made in breast cancer research, it remains difficult to predict which female patients are at increased risk of short-term survival and toxicity. In addition to traditional prognostic factors (high histologic grade, lymph node status, involved margins, tumor size) [
3], the identification of new clinical or biological markers is the goal of ongoing research for improving breast cancer management. Cancer patients usually suffer from changes in body composition parameters (e.g. weight loss, a typical characteristic of Cachexia). Cancer cachexia is a multidimensional syndrome that is characterized by unintended loss of both adipose tissue and lean body mass (LBM) and comes with adverse complications [
4]. It is estimated that cachexia is the main cause of death among 30–50% of cancer patients [
5]. In addition, lower physical function, decreased resilience to chemotherapy and radiation treatment, and generally worse prognoses are observed in cachectic patients compared to those with stable weight [
6]. However, other body composition parameters including muscle quantity and density have recently become a subject of research in the field of cancer prognosis [
7].
Sarcopenia is a condition defined as a syndrome associated with loss of muscle mass and strength as well as decreased physical performance in older adults [
8]. It shares some characteristics with age-related changes in muscle tissue, such as decreased satellite cells and fast-twitch muscle fibers and atrophy of slow-twitch muscle fibers [
9]. Numerous complex mechanisms lead to sarcopenia, including neurodegeneration, impaired signaling, inflammation, disuse, and declined nutrient intake. Sarcopenia has been shown to be prevalent in adults with cancer due to the increasing prevalence of disease with age [
10]. Furthermore, inflammation and malnutrition associated with cancer may worsen muscles. Currently, there are several diagnostic imaging techniques for assessing sarcopenia including dual-energy X-ray absorptiometry (DEXA), computed tomography (CT), magnetic resonance imaging (MRI), and bioelectrical impedance analysis (BIA) [
8]. Previous studies have reported that the presence of sarcopenia in patients with cancer is associated with negative clinical outcomes, such as post-operative complications [
11], increased chemotherapy toxicity [
12], and poorer overall survival (OS) [
13]. Recently, a meta-analysis has found that sarcopenia significantly increases mortality risk among various cancer types and stages [
14]. However, this study did not include breast cancer, although it is in fact the most common cancer type among women worldwide.
Inconsistent studies have been published examining whether sarcopenia is a risk factor for breast cancer mortality [
15,
16]. Over the past 5 years, an increasing number of studies have reported that there is an association between sarcopenia and mortality rate among women with breast cancer [
17‐
20]. A systematic review summarizing current literature on the evaluation of body CT-determined sarcopenia in breast cancer patients and its association with clinical outcomes has been published recently [
21]. Undoubtedly, mortality is one of the most important clinical outcomes in clinical oncology. Therefore, the aim of this systematic review and meta-analysis was to systematically assess and quantify sarcopenia as a risk factor for mortality in breast cancer patients.
Methods
We registered with the international prospective Register for Systemic Reviews for our meta-analysis with the number CRD42019138425 and conducted it according to the PRISMA guidelines.
Search strategy and selection criteria
A systematic literature search was initially conducted by two authors independently on PubMed, EMBASE, and the Cochrane CENTRAL Library of articles dating from database inception until May 4, 2019. The search strategy combined keywords and medical subject headings (Mesh) terms, such as mortality (death, survival), breast cancer (tumor, cancer, tumour), and sarcopenia (sarcopenias, sarcopenia, presarcopenia), and was tailored to each database. We used subject terms and truncation symbols in our search strategy to find all relevant studies. In addition, when seeking potential grey literature, references to eligible articles were searched using Google. The search strategy for the PubMed database is provided as Supplementary File
1.
Study selection
All relevant articles were examined initially (title and abstract). After that, screening was conducted independently by two blinded investigators (WWZ and YCZ). When a disagreement on study inclusion or exclusion occurred, the third reviewer (WWZ) intervened and a discussion ensued until a final consensus was reached.
Inclusion and exclusion criteria
Inclusion criteria
(1) Participants: adults 18 years and over with breast cancer; (2) A clear definition of sarcopenia, defined using a consensual method: CT scan (muscle area or muscle volume or skeletal muscle index), DXA (skeletal muscle index), BIA (skeletal muscle index); (3) Design: observational study; (4) Studies exploring the association between sarcopenia and mortality among breast cancer patients.
Exclusion criteria
(1) Article type: only abstract, review articles, letters and laboratory research, case report; (2) Insufficient data; (3) Irrelevant outcome.
The data from the selective studies were independently abstracted by two investigators (XMZ, QLD) using a standardized data-abstraction form. The following information - author, year of publication, country, demographic participant characteristics (e.g., stage of breast cancer, prevalence of sarcopenia, sample size, participant age), measurement methods and criteria of sarcopenia, length of follow-up, and study quality were extracted from the included studies. The investigators cross-checked all extracted data at every step, and any disagreements were dealt with by discussion until a consensus was reached.
Assessment of bias risk
Two independent reviewers (YZY, WWZ) assessed the risk of bias according to the Newcastle Ottawa Scale (NOS) [
22]. The NOS includes six aspects, and the scale’s highest possible total score is 9 points. The following NOS information was used: (1) representativeness of the exposed cohort, (2) comparability of group, (3) blinding of investigators who measured outcomes, (4) time and completeness of follow-up, (5) contamination bias, and (6) other potential sources of bias. We regarded a total score of ≥5 points as high-quality research.
Statistical analysis
Two authors (XMZ, YZY) analyzed the data independently using the software STATA version 14.0 (Stata Corp., College Station, TX, USA). Hazard ratios (HRs), and their 95% CIs of mortality for sarcopenic compared with non-sarcopenic participants were extracted from the studies that were included for meta-analysis. We also performed subgroup analyses according to stage of breast cancer, participant age, and length of follow-up if there was more than one study in a subgroup. The statistical heterogeneity of the included studies was examined with Cochran’s Q statistic using chi-square and I2 statistics, and we defined the cut-off I2 values of 25, 50, and 75% as low, moderate, and high heterogeneity, respectively. We decided to use a random-effects model based on heterogeneity when it was ≥50% or the p-value of the test of heterogeneity was less than 0.05. Otherwise, the fixed-effects model was used. We also conducted a publication bias and sensitivity analysis to test the stability of the meta-analysis, and the results were illustrated using forest plots.
In addition, in order to evaluate the reliability of the study results, we performed a trial sequential analysis (TSA) on all-cause mortality with a two-side α of 5% and a power of 90%. We assumed that breast cancer patients with sarcopenia would be linked with an at least 20% relative risk reduction in all-cause mortality.
Patient and public involvement
Patients or members of the public were not involved in the study.
Discussion
This study examined the association between sarcopenia and mortality in female breast cancer patients. The findings showed that breast cancer patients with sarcopenia had a 71% increased risk of mortality compared to patients without sarcopenia but have high heterogeneity. To the best of our knowledge, this is the first meta-analysis to systematically investigate the relationship between sarcopenia and all-cause mortality in female breast cancer patients. Our study indicated that screening female breast cancer patients for sarcopenia is crucial, because it may be a prognostic factor for female breast cancer patients.
The association between sarcopenia and mortality has been explored in many different populations, ranging from community-dwelling older adults [
23] to nursing home residents [
24]. Recently, a number of studies have found that sarcopenia can increase the risk of mortality among patients with certain types of cancer, such as lung cancer [
25], gastric cancer [
26], and colorectal cancer [
27], indicating that sarcopenia can be a predictive factor in cancer patients. This study has an important implication for medical personnel. First, for patients with early-stage breast cancer, screening for sarcopenia by means of simple CT images or dual-energy X-rays can provide information to medical personnel regarding when to initiate interventions so as to delay or even prevent sarcopenia and thus promote patients’ survival. Several studies have reported that physical training (e.g. aerobic or resistance exercises) [
28,
29] and nutritional supplements (e.g. vitamin D or omega-3 fatty acid dietary supplements) [
30,
31] can prevent the loss of muscle mass. Furthermore, our study found that the prevalence of sarcopenia in breast cancer patients was 45% [95% CI: 32–57], which was higher than in community-dwelling older adults [
32]. Considering this together with the results of previous studies substantiating that sarcopenia can increase the risk of negative clinical outcomes [
33,
34], it is recommended that assessment of sarcopenia should be incorporated as part of the routine clinical assessment for patients with breast cancer, particularly for those who are in the early stage.
In addition, metastatic breast cancer patients usually receive chemotherapy or radiotherapy to increase their overall likelihood of survival. However, they are susceptible to drug side effects and other complications such as malnutrition and cachexia [
35]. How to optimize a chemotherapy regimen for metastatic breast cancer patients remains a long-standing dilemma in clinical practice. Traditionally, physicians calculate the dose of chemotherapy according to the body surface area [
36]. Recently, some studies have reported that breast cancer patients with sarcopenia have greater risk of grade 3–4 toxicity and of suffering from a number of adverse effects than non-sarcopenic breast cancer patients [
16]. This indicates that sarcopenic breast cancer patients are more vulnerable to the side effects of chemotherapy. Therefore, screening for sarcopenia, particularly among metastatic breast cancer patients, becomes important for determining chemotherapy dosage.
The underlying mechanism that causes sarcopenia to increase the risk of all-cause mortality among breast cancer patients is more complicated. These factors may explain the relatively strong correlation between sarcopenia and mortality. First, the main feature of sarcopenia is muscle loss, which is a result of an imbalance between the pathways of synthesis and degradation of proteins, leading to an increase in muscle cell apoptosis and a decline in regenerative capacity [
37]. That muscle loss increases the risk of mortality has been confirmed in several previous studies [
38,
39]. Second, there is more evidence showing that muscle atrophy is associated with immune pathways and inflammation [
39]. Previous studies have found that lower levels of muscle mass are distinctly associated with high neutrophil to lymphocyte ratios, which are markers of systemic inflammation, which increases mortality [
40]. Third, sarcopenia is linked to proteolytic cascades, for instance the tumor necrosis factor (TNF-α) [
41], which have been demonstrated to promote tumor migration and invasion and are associated with a deterioration in breast cancer prognoses [
42]. Last but not least, sarcopenia is a geriatric syndrome rather than a disease, involving nervous system alterations as well as nutritional, hormonal, immunological, pro-inflammatory cytokines, aging and physical activity changes [
43]. The mechanism behind how sarcopenia leads to increased risk of mortality is very complex and requires more scientific research.
We conducted a subgroup analysis by disease stage and found that the presence of sarcopenia with non-metastatic breast cancer increased the risk of mortality compared to non-metastatic breast cancer without sarcopenia. However, the findings of this meta-analysis did not show an increased risk of mortality among metastatic breast cancer patients. It is acknowledged that there is high heterogeneity in each age group. We were particularly surprised by this result, as a previous study had confirmed that sarcopenia increased the risk of mortality in patients with metastatic solid tumors [
14]. Possible reasons could be that only two studies explored the relationship between sarcopenia and mortality in metastatic breast cancer patients. It is acknowledged that there were only 206 cases in the two studies of metastatic breast cancer patients, which means that some selective bias could have existed. Hence, it is possible that the number of studies included for analysis was too small to produce a significant result. Therefore, further studies on this issue should be conducted to clarify this unexpected result.
Age subgroup analysis found that participants aged 55 years and older with sarcopenia had a higher risk of mortality than participants younger than 55 years with sarcopenia. The results of this study suggest that aging could possibly play an important role in disease prognosis. According to some studies, the prevalence of sarcopenia increases as people age [
44], while aging accelerates the process of sarcopenia [
45]. Therefore, physicians need to screen breast cancer patients for sarcopenia earlier and undertake interventions to treat breast cancer patients with sarcopenia.
Our study has both strengths and limitations. One strength was that we conducted appropriate statistical analysis and performed comprehensive sensitivity and publication bias analysis. In addition, to our knowledge, this is the first meta-analysis to explore the relationship between sarcopenia and all-cause mortality in breast cancer patients. However, our systematic review and meta-analysis have some limitations. These limitations include the inclusion of studies that are observational and lack randomized controlled trials, which might include confounding factors that might influence the result. Furthermore, the number of studies included is small, which means that we could not perform certain subgroup analyses, such as subgroup analysis of sarcopenia measurement. In addition, it is acknowledged that breast cancer patients with sarcopenia may also have cachexia, which can affect the degree of muscle function. Unfortunately, all six studies included in this review did not take cachexia into account. Finally, the cut-off values for defining sarcopenia were different. One study used median muscle volume to dichotomize patients as having sarcopenia or not, whereas four studies used SMI < 41.0 cm2/m2 to determine sarcopenia, which means that there could be an overestimation or underestimation of the effects of sarcopenia.
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