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The effects of physical activity on overall survival among advanced cancer patients: a systematic review and meta-analysis



The survival rates of advanced cancer patients remain low despite clinical therapy advancements. However, physical activity showed promising effects in improving cancer outcomes. This review aimed to systematically evaluate and synthesize the effects on overall mortality of post-diagnosis physical activity in advanced cancer patients.


A systematic search of six English databases (PubMed, EMBASE, CINAHL, PsycINFO, The Cochrane Central Register of Controlled Trials, and SPORTDiscus) was conducted from their inception up to 3 February 2021. The association of physical activity with survival was evaluated by combining study-specific hazard ratios with random-effects meta-analysis models.


Eleven studies were identified. Compared with the reference group, higher-level physical activity was not significantly associated with a lower risk of earlier mortality in advanced cancer patients (InHR = − 0.18, 95% CI, − 0.36 to 0.01). When separated by study type, a higher level of physical activity in non-randomised trials was significantly associated with reduced mortality risk (InHR = − 0.25, 95% CI: − 0.44, − 0.06). However, in randomised trials, engaging in exercise was not significantly associated with a lower mortality risk compared with the control group (InHR = 0.08, 95%CI: − 0.17, 0.32).


Discrepancies were uncovered in the effect of physical activity on overall survival in randomised and non-randomised trials. In non-randomised trials, a higher level of physical activity was significantly associated with a lower risk of mortality, whereas no significant effect on survival was observed during exercise interventions compared to the control in randomised trials. Considering the wider benefits of physical activity, exercise can still be recommended to improve outcomes for advanced cancer patients. Nevertheless, it might be too late for advanced cancer patients to start exercising for survival improvements, based on findings from randomised controlled trials.

Peer Review reports


In 2018, there were 18 million new cases of cancer worldwide, the second leading cause of death (estimated at 9.6 million) [1]. The most common newly diagnosed cancers were lung, breast, and colorectal cancers [1]. Among these, approximately half of the newly diagnosed lung and colorectal cancer patients are at an advanced or metastatic stage. Moreover, the majority of patients diagnosed at an earlier stage of the disease eventually develop tumour progression [2, 3]. The 5-year relative survival rates for numerous advanced-stage cancers such as lung, colorectal, breast, liver, and pancreatic remain low, ranging from 2 to 27% [4]. Ultimately, patients with advanced cancer are susceptible to substantial physical and psychological distress that exacerbate near the end of life [5].

Physical activity is being progressively studied as a nonpharmacologic intervention to maximise health benefits and outcomes in a healthy general population and in populations with chronic illnesses and cancers [6, 7]. Along with improving physical and psychological well-being, engaging in regular physical activity or increasing levels of physical activity were associated with decreased mortality risk and longer healthy living among healthy adults and elderly populations [8,9,10,11]. Some reviews have even reported an association between pre- and post-diagnosis physical activity and cancer survival. A review of prospective cohort studies in cancer patients at all stages suggested that higher levels of physical activity decreased the risk of cancer-related mortality, specifically in breast, and colorectal cancer populations [12]. Furthermore, findings from a recent large-scale meta-analysis that included both randomised trials and cohort studies reported that physical activity added to survival benefits in prostate, lung, liver, stomach, oesophageal, and female reproductive cancers of various stages [13]. Potential biological mechanisms have been proposed to explain the protective effect of physical activity on total and cancer mortality. In particular, exercise could lead to favourable effects on factors that contribute to cancer progression, including inflammation, immune function, oxidative stress, and metabolic hormones [14, 15].

Currently, research focused on the implementation and benefits of physical activity in later stages and metastatic cancer populations is significantly fewer than in patients with early-stage cancer, probably due to perceptions of physical disability and limitations in the former population. However, not all patients with metastatic or advanced cancer fall within the palliative or end-of-life cancer spectrum [16]. More than half of these patients are highly functional, with less than one impairment in activities of daily living and having good self-perceived quality of life until their last month of life [17]. Thus, introducing physical activity appears to be an appropriate intervention in this population. Three recently published reviews demonstrated that exercise interventions improved physical function, quality of life, and sleep quality, as well as reduced fatigue in patients with advanced cancer [18,19,20,21]. However, the effects of exercise on survival in this population remain inadequately understood due to the limited publications in survival data of advanced cancer patients, as well as being confined to reviews of longitudinal observational studies [12].

To the best of our knowledge, no systematic review or meta-analysis has been performed previously to investigate the effect of physical activity on survival in advanced cancer populations, encompassing both randomised control trials (RCTs) and non-randomised studies. This review, therefore, aimed to systematically evaluate and synthesize the effects of post-diagnosis physical activity on overall mortality in advanced cancer patients from all available non-randomised studies and RCTs, as well as appraise the methodological quality of the included studies.


Search strategy

This meta-analysis was conducted in accordance with the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines [22]. A comprehensive literature search was conducted using the following databases: PubMed, EMBASE, CINAHL, PsycINFO, The Cochrane Central Register of Controlled Trials (CENTRAL), and SPORTDiscus, from the inception of the databases up to 3 February 2021. The following keywords “advanced”, “cancer”, “exercise”, and “survival”, and their medical subject headings or equivalent and text word terms were used as search terms. For an example of search strategy in PubMed, see Additional file 1. A manual review of the reference lists of the previously published meta-analyses and systematic reviews as well as from the selected articles was performed to identify potentially relevant articles.

Eligibility criteria

Eligibility was determined using the following criteria: (1) peer-reviewed articles or published abstracts in English; (2) RCTs or non-RCTs (i.e., single-arm trial, cohort study, case-control study, cross-sectional study, and observational study); (3) presenting results on adult (aged > 18 years) cancer patients; (4) included the assessment of engagement in physical activity or physical activity as the intervention or a component of intervention; (5) investigating one or more survival outcomes; and (6) included ≥80% participants diagnosed as having advanced cancer or in studies in which separate analysis of advanced cancer is reported. Editorials, letters, comments, case reports, conference letters, qualitative research studies, systematic reviews, and meta-analyses were excluded.

The outcome of interest in this study was survival, measured at the end of the follow-up period through outcome measurements including survival probability, disease-free survival, cancer-specific mortality, and overall mortality. These outcomes were expressed as hazard ratios (HRs) or relative risks. The survival outcome measures that were commonly reported by the included studies were selected in this meta-analysis.

Study selection

The selection was initially based on information in the title and abstract, with the entire manuscript examined if the initial information was inconclusive. Two reviewers (N.T. and S.L.C.) independently examined the search results, and disagreements were resolved by discussions to reach consensus. When more than one article reported on the same study, the article with the larger sample size or longer survival follow-up period was selected.

Data extraction and quality assessment

Data extraction for all relevant studies was independently performed by two reviewers (N.T. and S.L.C.). All information regarding study characteristics (author, year, study design, year of publication), participant characteristics, physical activity characteristics and measures, survival outcome, follow-up duration, and summary of findings, were recorded using a predesigned data-extraction form. When insufficient data or unclear presentations were found in the articles, the corresponding authors were contacted for clarification.

The methodological quality of RCT was independently assessed by the two reviewers using the Cochrane Risk of Bias tool 2.0 (RoB 2) [23]. RoB 2 assessed five domains of bias: (1) bias arising from the randomisation process, (2) bias due to deviations from intended interventions, (3) bias due to missing outcome data, (4) bias in measurement of the outcome, and (5) bias in selection of the reported results. Studies were considered to have “low” or “high” risk-of-bias or “some concerns” in the overall risk-of-bias judgment.

On the other hand, the quality of observational studies was assessed using the Newcastle-Ottawa Quality Assessment Scale (NOS) on three domains: selection of exposed and unexposed cohorts (representativeness of the exposed cohort, selection of the unexposed cohort, ascertainment of exposure, and demonstration of absence of outcome at the beginning of studies), comparability of exposed and unexposed cohorts (analysis appropriately adjusted for potential confounding factors, including the most important and additional factors), and outcome ascertainment (adequacy of outcome assessment, length of follow-up, and adequacy of follow-up). A total score of 7 or more denotes high-quality studies [24]. The NOS is a comprehensive validated tool used to evaluate the quality of non-RCTs in meta-analysis [24].

Statistical analyses

The pooled estimate for the association of physical activity with the outcome of interest was evaluated by combining study-specific HRs and 95% confidence intervals with random-effects meta-analysis models using log-transformed HR (lnHR). In studies where HR and its variance were not presented, the log HR from the included studies’ survival curves was estimated, obtaining survival results for both groups at time points along the survival curves to estimate HR and 95% confidence intervals between the physically active group and the control group. This approach was conducted as proposed by Parmar et al. [25]. Heterogeneity was investigated in each analysis using I2 values, which describe the percentage of variation across studies due to heterogeneity. Meta-regression was performed to further evaluate heterogeneity in terms of study characteristics. Moreover, we used separate analysis models for the study types (RCT and non-RCT). We performed sensitivity analysis using leave-one-out analysis to test whether individual studies disproportionately influenced the results. We used a trim-and-fill approach and funnel plots to investigate possible publication bias. All analyses of pooled effectiveness were conducted using STATA version 16.


Study selection

The initial search of the specified electronic databases generated a total of 4533 studies, of which 4033 were deemed potentially relevant after removal of duplicates. An additional search of the reference lists returned seven potentially relevant articles, three of which were excluded, leaving 33 eligible studies for full-text review. A total of 14 studies that matched the inclusion criteria were included in the qualitative synthesis, with 11 of the 14 studies included in the meta-analysis due to the absence of HRs or survival curves (Fig. 1).

Fig. 1

PRISMA Flow Diagram of Literature Search and Selection Process

Characteristics of the studies

Tables 1 and 2 summarise the characteristics of the 14 studies. Of the 14 included studies, six were RCTs [26,27,28,29,30,31] and eight were non-RCTs (one single-arm trial and seven cohort studies) [32,33,34,35,36,37,38,39] . The 14 included studies involved 3011 participants, with sample sizes ranging from 31 to 1218. The methodological quality of the studies is presented in Tables 3 and 4. The majority (5/6) of the included RCTs had a high overall risk of bias. The most common reasons for high risk of bias were the absence of blinding, low adherence to intervention, and inappropriate analyses used to estimate the effect of intervention adherence. On the other hand, four non-RCTs (4/8) scored 7 or greater, indicating a high quality. The most common reasons for reduction on the scale were the use of self-administered physical activity assessment tools, which have risks of overestimating the levels of physical activity compared to objective measures [40] and having a non-representative sample in the NOS scale, as studies recruited small sample sizes from a single clinic, limiting their generalizability.

Table 1 Characteristics of the randomized trials
Table 2 Characteristics of non-randomized trials
Table 3 Methodological quality of randomized trials
Table 4 Methodological quality of non-randomized trials

Participant characteristics

Information about the participants are also shown in Tables 1 and 2. The mean age ranged from 53.8 to 68.5 years. Reporting of advanced stages of disease varied, with six studies defining the sample as advanced cancer by stage (IIIB/IV) [26, 27, 30, 35, 38, 39]. Four studies described the sample as having advanced cancer patients [28, 31, 34, 37], three studies characterized the sample as advanced based on their described pathologies [29, 32, 33], and one study by the palliative care treatment the patients received [36]. Six of the studies focused on multiple cancer sites [26, 28,29,30,31, 36], four on lung cancer [27, 35, 37, 39], two on colorectal cancer [32, 34], and breast cancer [33, 38]. Participants in nine of the studies were undergoing cancer treatment, were scheduled for treatment in three of the studies, and completed treatment in one of the studies, whereas one study did not specify treatment conditions.

Physical activity type and assessment

All studies examined post-diagnosis physical activity. Among the six RCTs and one single-arm trial, six were a combination of aerobic and resistance training [26,27,28, 30,31,32], three of which consisted of an additional component of behavioural support or nutritional counselling [27, 30, 31]. The remaining one was resistance training alone [29]. Among the remaining seven cohort studies, the majority (5/7) of studies used self-administered questionnaires or questions [33,34,35, 38, 39] whereas the remaining two used accelerometers [36, 37]. The amount of physical activity in four studies was calculated by the metabolic equivalent (MET) [33,34,35, 38], one each by hours of standing, supine or sitting position [36], number of daily step count [37] and kilocalories per week [39].

Survival outcome and assessment

All six RCTs and one single-arm trial compared survival outcomes between the intervention group and the control group or the non-participation control (Table 1). The associations between different levels of physical activities and survival outcomes were examined in the remaining seven cohort studies (Table 2). The median follow-up duration ranged from 8 months to 6.18 years.

Description of the study results: summary of outcomes

The survival outcome between the intervention and control groups was not significant in all RCTs and the single-arm trial. Two out of the seven cohort studies demonstrated significant results between different levels of physical activities and survival outcomes, whereas the other four studies revealed insignificant results.

Meta-analysis of studies: physical activity and cancer survival

Four RCTs and seven non-randomised trials (one single-arm trial and six cohort studies) were included in the meta-analysis. Figure 2 presents the results of the meta-analysis of physical activity and overall survival among advanced cancer patients. Compared with the reference group (lower-level physical activity or control group), higher-level physical activity was not significantly associated with a lower risk of earlier mortality in advanced cancer patients (InHR = − 0.18, 95% CI, − 0.36 to 0.01). Moreover, heterogeneity was moderate (I2 = 37.11%). A separate meta-analysis showed that study types played an effect on the heterogeneity of studies. For non-randomised trials, a higher level of physical activity was significantly associated with a reduced risk of mortality (InHR = − 0.25, 95% CI, − 0.44 to − 0.06, I2 = 22.87%) (Fig. 3). For randomised trials, participation in the intervention group was not significantly associated with a lower risk of mortality, compared with the control group (InHR = 0.08, 95%CI, − 0.17 to 0.32, I2 = 0.00%) (Fig. 3). The trim-and-fill analysis imputed two studies to increase symmetry in the funnel plot for all studies. The effect size from the observed and imputed studies did not change the significance of the meta-analysis with all included studies (InHR = − 0.11, 95%CI, − 0.31 to 0.08) (Fig. 4). The leave-one-out analysis was conducted among subgroups of studies (RCTs and non-randomised trials), and no change in significance was found when removing individual studies.

Fig. 2

Forest plot for the association between PA and overall survival in advanced cancer patients. InHR with 95% CI log hazard ratios with 95% confidence intervals, lower scores in InHR favour intervention.Abbreviations. InHR: Log transformed hazard ratio; PA: Physical activity

Fig. 3

Forest plot for the association between PA and overall survival, as separated by study types. InHR with 95% CI log hazard ratios with 95% confidence intervals, lower scores in InHR favour intervention.Abbreviations. InHR: Log transformed hazard ratio; PA: Physical activity

Fig. 4

Funnel plot of all included studies. The circles indicate studies, and the triangle indicates added hypothetical studies from the trim-and-fill approach


Summary of evidence

To the best of our knowledge, this is the first meta-analysis examining the association between physical activity and overall survival in advanced cancer patients, comprising both randomised and non-randomised trials. Based on the 11 included studies, our comprehensive meta-analysis indicated with moderate heterogeneity that post-diagnosis physical activity had no effect on the overall survival among advanced cancer patients. However, heterogeneity was reduced to low levels when the analysis was separated by study type (randomised and non-randomised trials). Notably, a higher level of physical activity significantly reduced overall mortality in non-randomised trials, whereas the result remained insignificant for randomised trials.

Interestingly, significant associations between physical activity and survival were shown among non-randomised trials when the analysis was separated from RCTs. The discrepancies in the overall results in RCTs and non-RCTs may be attributed to the relatively shorter follow-up time (end-point range: 12–35 months) in RCTs than in non-RCTs (median range: 8–74 months). Hence, the survival data collected in RCTs might not be as complete as those in non-randomised trials to reflect the impact of physical activity on survival. In addition, RCT participants may have only started exercising after participating in the study, whereas for cohort studies, participants may have adopted the habit of exercise for a period of time before participating in the study. Therefore, the absence of significant findings in RCTs may reflect that it is too late for advanced cancer patients to start exercising to exert favourable effects on survival. All included RCTs did not exclude those with a history of exercise, and that may lead to contamination in the control group and minimal difference in physical activity between the two groups. Furthermore, the insignificant results yielded by comparing the overall survival between the intervention and control groups in the included RCTs might be attributed to the adherence to exercises. The adherence rate of intervention groups to the protocol of the physical activity intervention ranged from 69 to 76.9% [26,27,28], with one study not reporting adherence [29]. The amount of physical activity engaged in by the participants in the intervention group after the intervention period as well as the amount of physical activity engaged in by the control group at baseline were not reported in the included studies. Hence, it is possible that the intervention did not elicit a substantial difference in the amount of physical activity engaged in by the different groups. This finding is supported by one included study revealing minimal differences in the physical activity levels between groups during the study period, which might explain the lack of differences in outcomes [27]. Future RCTs should record and report the total amount of physical activity engaged in by both intervention and control groups to allow a more accurate comparison. In addition, three of the four included studies did not explicitly report HRs with variance; instead, the log HRs were estimated by the reviewers from the published survival curves. It should be noted that the results of the estimated log HRs might be subject to underestimation of the true impact of physical activity on survival [25].

Nonetheless, the significant results in the included non-randomised trials should be considered with the potential for bias and confounding within observational studies. The causation is difficult to imply based on the associations reported by the non-randomised trials included in our meta-analysis. For example, patients with higher levels of physical activity could be explained by the fact that they have better physical functioning and less symptom burden, and thus they are more active and could potentially have a longer survival duration. This assumption is supported by the findings of two included non-RCTs studies that higher proportion of patients with better performance status were reported in more physically active ones [33, 34]. Other limitations for observational studies include the possible risk of residual confounding factors that make it difficult to elucidate the real relationship between physical activity and overall survival.

We observed a growing number of studies conducted on physical activity in cancer patients since 2010, and there is still a paucity of evidence for physical activity among advanced cancer patients that could allow comprehensive and separate analyses by primary cancer sites. However, the optimal dose, modality, and timing of physical activity for advanced cancer patients in order to maximise its beneficial effects on survival outcomes remain unclear. Future studies could specifically include only one group of advanced cancer populations in order to generate more specific results and physical activity recommendations. Furthermore, only the effect of conventional physical exercises, namely aerobic or resistance or a combination of both exercises, on survival outcomes were reported in existing studies. There were yet to have studies evaluating the effect of mind-body exercise on survival. Increasing research has been conducted on mind-body exercise, another modality of exercise that combines body movement and meditation, such as tai chi, qigong, and yoga. A recent meta-analysis demonstrated that mind-body exercise led to significant improvements in various aspects such as physical fitness, fatigue, sleep quality, psychological distress in cancer survivors [41]. Therefore, future studies could investigate the effect of mind-body exercise on survival in cancer patients. Only post-diagnosis physical activity levels were assessed in the included studies, none of the studies investigated the pre-diagnosis physical activity levels. This maybe a confounding factor as previous studies found that pre-diagnosis physical activity levels is associated with survival in other cancer patients [42, 43]. Future studies should examine the pre-diagnosis physical activity levels that might have an impact on survival. Although physical activity was not directly associated with a reduction in the risk of mortality, other beneficial effects of physical activity in advanced cancer patients cannot be underestimated. The favourable effects demonstrated in previous reviews included improvement in physical function, sleep quality, quality of life, and reduction of depression, fatigue, and pain as well as decreased psychological complaints [18,19,20,21].

Clinical implications

No evidence of detrimental effects of physical activity due to intervention was reported in the included studies. It might be possible that among advanced cancer patients, it is too late to start exercising for it to have effects on survival. Although the findings suggested that physical activity may have no effect on the overall survival in advanced cancer populations, healthcare professionals should consider the wider evidence of the beneficial effects of physical activity on other health-related outcomes, namely physical function, sleep quality, quality of life, and psychological distress [18,19,20,21].

Strength and limitations

The strengths of this meta-analysis include its inclusion of both randomized and non-randomized trials, and studies reporting HRs with variance or survival curves. Thus, the results were more comprehensive in reflecting the association between physical activity and survival in an advanced cancer population. However, our meta-analysis has several limitations that merit further consideration. First, the number of studies included was relatively small, which limited the use of meta-regression for various factors as well as dose-response analyses. However, we were able to use study types (RCT and non-RCT) to explain the heterogeneity, and the heterogeneity reduced to 0 and 22.87%, respectively. Second, information on physical activity in non-randomised studies was self-reported except in two studies which utilized accelerometers; thus, it was prone to potential recall errors that may have biased the results. Future epidemiologic studies could adopt objective measurements of physical activity. Third, the majority of the included randomised trials did not account for other confounding risk modifiers, such as contamination in the control group that might potentially affect the results. Fourth, only 2 out of 7 non-RCTs have reported the performance status separately for the physically active and inactive cohorts, which might be a potential reason accounting for the differences in survival. Lastly, the log HRs in the four included studies were estimated from the published survival curves, which are prone to underestimation of the impact.


In conclusion, this meta-analysis of currently available evidence suggests that participation in physical activity interventions may have no effect on overall survival among advanced cancer patients. However, the conclusion should be interpreted with the consideration of results possibly differing when randomised and non-randomised trials are separated. A higher level of physical activity was significantly associated with a lower risk of mortality in non-randomised trials, whereas no significant effect on survival was shown in exercise groups compared to control groups in RCTs. Given the safe nature and wider beneficial effects of physical activity, a set of recommendations for physical activity could be developed to serve as a component of survivorship for advanced cancer populations. The insignificant results in RCTs may be attributed to the presence of confounding risk modifiers such as contamination. There is a need for adequately powered, randomised, controlled exercise interventions to carefully interpret the impact of physical activity on survival and other clinically relevant outcomes such as number of hospital admissions, days spent in hospital, and financial toxicity.

Availability of data and materials

The datasets generated and/or analysed during the current study are available in PubMed,, EMBASE,, CINAHL,, PsycINFO,, The Cochrane Central Register of Controlled Trials (CENTRAL),, and SPORTDiscus,



Confidence interval


Hazard ratio


Log transformed hazard ratio


Metabolic Equivalent


Newcastle-Ottawa Quality Assessment Scale


Preferred Reporting Items for Systematic Reviews and Meta-analyses


Randomized control trial


Risk of Bias tool


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We would like to thank Matthew Sydes and Jayne Tierney for developing the spreadsheet for estimating hazard ratios from published survival curves.


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NT and CCL conceived and designed this study. NT and SLC were involved in literature search and screening. NT and RS analysed and interpreted the data. NT wrote the first draft. RS, DSTC and CCL reviewed and edited the paper. All authors read and approved the final manuscript.

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Correspondence to Chia-Chin Lin.

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Additional file 1.

Search strategy for PubMed. List of keywords used for literature search in PubMed.

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Takemura, N., Chan, S.L., Smith, R. et al. The effects of physical activity on overall survival among advanced cancer patients: a systematic review and meta-analysis. BMC Cancer 21, 242 (2021).

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  • Advanced cancer
  • Meta-analysis
  • Physical activity
  • Survival