Effects from physical exercise on reduced cancer-related fatigue: a systematic review of systematic reviews and meta-analysis

Effectiveness and Safety of Bright Light Therapy in Oncological Patients: A Systematic Review

Light therapy, also known as bright light therapy, is a nonpharmacological approach to treat seasonal mood disorders and a wide range of other conditions by exposure to artificial light. Bright light therapy is considered a well-tolerated and easy to administer form of treatment with relatively low costs. Our systematic review is focused on the available literature data regarding the applications of this therapy to the field of oncology. Overall, in this context light therapy has showed promising results, providing a safe and potentially effective treatment for a variety of psychological symptoms (especially sleep disturbances and fatigue, but also mood and anxiety symptoms). Thereby, taking into account the enormous impact of all these symptoms on cancer patients' health-related quality of life, the validation and integration of bright white light therapy in the therapeutic armamentarium of these patients may be potentially highly beneficial in the daily clinical practice and could hopefully lead to a more comprehensive and integrated oncology care.

Effects of a Comprehensive Program on Reducing Cancer-Related Fatigue: A Randomized Controlled Trial

CONTEXT

Cancer-related fatigue (CRF) can affect patients undergoing chemotherapy severely. A comprehensive intervention targeted for reducing CRF is lacking.

OBJECTIVES

To evaluate the effectiveness of an innovative multifaceted web-based patient-empowered CRF management program for improving CRF, perceived self-efficacy for fatigue self-management (PSEFSM), physical activity, quality of sleep, anxiety, depression, pain and quality of life (QoL) among gastric cancer patients undergoing chemotherapy in China.

METHODS

A total of 92 eligible gastric cancer patients undergoing chemotherapy were recruited and randomly assigned to two groups. Participants in the intervention group received a 12-week CRF intervention including eight online sessions, patient diary for self-management practice; telephone follow-up and online support via WeChat. The control group received routine care. Primary outcome was CRF. Secondary outcomes included PSEFSM, physical activity, quality of sleep, anxiety, depression, pain, and QoL. Outcome variables were measured three times: at admission(T0), post-intervention(T1) and one-month post-intervention(T2). Repeated measures ANOVA or generalized estimating equations were used to evaluate the intervention effect.

RESULTS

Significant group by time interaction was found in the scores of total CRF and its three dimensions, PSEFSM, total physical activities, quality of sleep, anxiety, depression, and QoL of the two groups (P <0.05). No significant difference was found in pain scores (P >0.05).

CONCLUSION

This study provides evidence that an innovative multifaceted web-based patient-empowered CRF management program is effective in reducing CRF and improving related symptoms (depression, anxiety, quality of sleep), physical activity, PSEFSM and QoL for gastric cancer patients undergoing chemotherapy.

Patient clusters based on demographics, clinical characteristics and cancer-related symptoms: A cross-sectional pilot study

PURPOSE

This study aimed to identify and preliminary validate distinct clusters of patients with cancer based on demographics, clinical characteristics, and symptoms and to inform future research on sample size requirements for achieving sufficient power in clustering analyses.

METHODS

This cross-sectional pilot study involved 114 patients with cancer from two hospitals in northern Italy. Data were collected on demographics, clinical characteristics, and 20 symptoms using the Edmonton Symptom Assessment System in October 2022. t-distributed stochastic neighbor embedding (t-SNE) was used to reduce the symptom data and demographics (e.g., age) into two components, which were then clustered using Ward's method. A Monte Carlo simulation was conducted based on the t-SNE components to estimate the sample size needed to achieve 80% power for different cluster solutions (k = 2, 3, 4).

RESULTS

Two distinct clusters were identified: Cluster 1 (Higher Symptom Burden Cluster) and Cluster 2 (Lower Symptom Burden Cluster). Cluster 1 patients had a higher prevalence of depression, anxiety, and drowsiness. Monte Carlo simulations indicated that 50 patients per cluster were sufficient for k = 2 clusters to achieve 80% power, whereas 90 patients per cluster were needed for k = 3 clusters and 120 patients per cluster for k = 4 clusters.

CONCLUSION

This study identified distinct patient clusters and provided preliminary evidence on the sample size required for clustering analyses in cancer research. Understanding patient clusters enables nurses to provide tailored interventions, potentially improving symptom management and overall patient care.

The course of self-perceived cognitive functioning among patients with lymphoma and the co-occurrence with fatigue and psychological distress

PURPOSE

To investigate the proportion of patients with lymphoma with persistent clinically relevant cognitive impairment, and its relation to  treatment, fatigue, and psychological distress.

METHODS

Patients with diffuse-large-B-cell-lymphoma (DLBCL), follicular-lymphoma (FL), and chronic-lymphocytic-leukemia (CLL)/small-lymphocytic-lymphoma (SLL), diagnosed between 2004-2010 or 2015-2019, were followed up to 8 years post-diagnosis. Sociodemographic and clinical data were obtained from the Netherlands Cancer Registry and the Population-based HAematological Registry for Observational Studies. The EORTC QLQ-C30 was used to assess cognitive functioning and fatigue, and the HADS to assess psychological distress. Individual growth curve models were performed. Results were compared with an age- and sex-matched normative population.

RESULTS

A total of 924 patients were included (70% response rate). Persistent cognitive impairment was twice as high in patients (30%) compared to the normative population (15%). Additionally, 74% of patients reported co-occurring symptoms of persistent fatigue and/or psychological distress. Patients with FL (- 23 points, p < 0.001) and CLL/SLL (- 10 points, p < 0.05) reported clinically relevant deterioration of cognitive functioning, as did the normative population (FLnorm - 5 points, DLBCLnorm - 4 points, both p < 0.05). Younger age, higher fatigue, and/or psychological distress at inclusion were associated with worse cognitive functioning (all p's < 0.01). Treatment appeared less relevant.

CONCLUSION

Almost one-third of patients with lymphoma report persistent cognitive impairment, remaining present up to 8 years post-diagnosis. Early onset and co-occurrence of symptoms highlight the need for clinicians to discuss symptoms with patients early.

IMPLICATIONS FOR CANCER SURVIVORS

Early recognition of cognitive impairment could increase timely referral to suitable supportive care (i.e., lifestyle interventions) and reduce (long-term) symptom burden.

[(Surviving) life with cancer: the importance of sport and physical activity]

As the survival prognosis of cancer patients continues to improve, the improvement in quality of life during and after cancer treatment is becoming increasingly important 1. Exercise therapy has a positive effect on so-called "patient-reported outcomes" 2. The combination of endurance training and individualized strength training plays a particularly important role here. There is therefore a need for consistent and comprehensive implementation of quality-assured exercise therapy in everyday clinical practice.

Effects of Baduanjin exercise on cancer-related fatigue in patients with prostate cancer treated with androgen deprivation therapy in Shanghai, China: a study protocol for a randomised controlled trial

INTRODUCTION

Cancer-related fatigue (CRF) is one of the most common and painful symptoms in patients with prostate cancer (PCa). Moreover, PCa patients who receive the androgen deprivation therapy (ADT) are more likely to develop CRF. Baduanjin exercise has been shown to improve CRF in some cancers. However, such effects have not been verified in patients with PCa treated with the ADT. So, this study was designed as a randomised controlled trial (RCT) to explore the effects of Baduanjin exercise on CRF in PCa patients treated with the ADT.

METHODS AND ANALYSIS

This study will be a single-centre, assessor and statistician blinded, RCT consisting of a 12 week intervention and 12 week follow-up. Patients with PCa who meet the inclusion criteria will be recruited from Shanghai Hudong Hospital. Participants will be randomly assigned to Baduanjin exercise group (n=42) and the control group (n=42), performing 12 weeks of Baduanjin exercise or reeiving the standard care. The primary outcome will be the clinical effect of Baduanjin exercise on CRF in PCa patients, which will be measured using the Piper Fatigue Self-Assessment (PFS) scale, a multidimensional measure of CRF using three different dimensions: somatic, emotional and cognitive. The secondary outcome will be the clinical effect of the Baduanjin exercise on the patient's level of fatigue, sleep, depression and life quality at the time, which will be assessed by the Brief Fatigue Inventory (BFI), the Pittsburgh Sleep Quality Index (PSQI), the Beck Depression Inventory (BDI) and the Functional Assessment of Cancer Therapy-Prostate (FACT-P).

ETHICS AND DISSEMINATION

This study has been approved by Shanghai Hudong Hospital Ethics Committee, Shanghai province (2022 SHHDKY08). The trial results will be submitted to conferences and peer-reviewed journals.

TRAIL REGISTRATION NUMBER

ChiCTR2300074293.

[Rehabilitative strategies in cancer-related fatigue]

Cancer-related fatigue (CRF) during and after tumor therapy influences all aspects of life and lowers performance and quality of life. Regular CRF screening and diagnostic evaluation are important factors in the care of patients. This article presents strategies for recognizing and treating CRF. Multiprofessional and personalized therapies can improve CRF. Outpatient and inpatient rehabilitative strategies should be implemented after completion of tumor therapy.

iCan, Empowering Recovery: Evaluating a Patient-Centred Cancer Rehabilitation Programme across the Cancer Care Continuum

BACKGROUND/OBJECTIVES

The adverse effects of cancer and the long-term sequelae of associated treatments result in reduced quality of life and increased mortality for patients. Supporting patients with cancer to mitigate adverse outcomes is an important aspect of oncology care and the primary purpose of cancer rehabilitation. A retrospective service evaluation was conducted to evaluate the effectiveness of the core iCan patient-centred cancer rehabilitation service.

METHODS

At the beginning and end of a five-week programme, a series of questionnaires evaluating changes in mental health and wellbeing, and physical activity performance/attitudes, and functional capacity were administered to participants.

RESULTS

Following iCan, we found that functional capacity was improved (30 s sit-to-stand: +6.3 repetition; d = -1.00, p < 0.001) and that self-reported physical activity was increased (~1173 MET-mins/wk; d = -0.76, p < 0.001); participants also perceived greater capability, opportunity, and motivation to be active. Mental wellbeing was also improved (SWEMWBS: d = -0.69, p < 0.001), whilst fatigue was reduced (FACIT: d = -0.77, p < 0.001).

CONCLUSION

It appears that iCan has beneficial effects upon the physical/functional and psychological health of its participants. Where data are available, there appear to be clinically significant improvements across the range of measured functional, wellbeing, and activity/sedentariness outcomes, which suggest that participation in iCan is instrumental in adding value to the health and wellbeing of patients.

Effects of multidimensional exercise management on self-efficacy, blood glucose control, and delivery outcomes in pregnant women with gestational diabetes mellitus

Objective

This study aimed to evaluate the effects of multidimensional quantitative exercise management on self-efficacy, blood glucose control, and delivery outcomes in pregnant women with gestational diabetes mellitus (GDM).

Methods

A randomized controlled trial was conducted with 150 pregnant women diagnosed with gestational diabetes mellitus (GDM). Participants were randomly assigned to either the experimental group (Exp), which received a multidimensional quantitative exercise management intervention, or the control group (Con), which received standard GDM management. Results were compared between the groups included self-efficacy scores, blood glucose levels, and delivery outcomes.

Results

Exp group of pregnant women exhibited drastically superior self-efficacy scores as well as more stable blood glucose levels during pregnancy relative to Con group (P < 0.05). Moreover, visual analogue scale (VAS) of pregnant women and Apgar scores of infants in Exp group were considerably better than those in Con group (P < 0.05). In contrast to Con group, pregnant women in Exp group had considerably better labor outcomes along neonatal complication rates (P < 0.05).

Conclusion

Multidimensional quantitative exercise management had a positive impact on pregnant women with GDM. This intervention method can improve self-efficacy levels along better blood glucose control, and enhance delivery outcomes. These findings suggested that multidimensional quantitative exercise management has potential clinical value in the management of GDM, providing an effective management strategy to improve the health conditions of both pregnant women and infants.

The efficacy of high-fidelity simulation on knowledge and performance in undergraduate nursing students: An umbrella review of systematic reviews and meta-analysis

OBJECTIVES

This umbrella review aimed to consolidate the evidence base on the impact of high-fidelity simulation on knowledge and performance among undergraduate nursing students.

DESIGN

Umbrella review with meta-analyses of pooled effect sizes, followed by an additional meta-analysis of primary studies from the included systematic reviews, excluding overlapping results.

DATA SOURCES

Systematic searches were performed up to August 2023 in PubMed, Embase, and Cochrane Library. We included reviews that compared high-fidelity simulation against other learning strategies.

REVIEW METHODS

The risk of bias was assessed for each included systematic review (ROBIS tool) and primary study (RoB 2 or ROBINS-I as appropriate). Random-effect meta-analyses of meta-analyses were performed to estimate the pooled effects of high-fidelity simulation on knowledge and performance. Further random-effect meta-analyses of primary studies were conducted, with overlapping studies excluded (12 %). Subgroup analyses were performed to provide a more comprehensive analysis of the findings. Trim-and-fill analyses were conducted to adjust for potential publication bias.

RESULTS

Six systematic reviews were included and encompassed 133 primary studies (2767 and 3231 participants concerning performance and knowledge, respectively). The adjusted pooled effects for knowledge (SMD = 0.877, 95 % CI: 0.182 to 1.572) and performance (SMD = 0.738, 95 % CI: 0.466 to 1.010) closely aligned with those obtained from meta-analyzing the primary studies for knowledge (SMD = 0.980) and performance (SMD = 0.540), both showing high statistical heterogeneity. Traditional lectures represented the more common comparison. The subgroup analysis revealed significant differences in effect sizes across geographic locations, topics, types of control, and how interventions were reported.

CONCLUSIONS

The results provide robust evidence supporting the integration of high-fidelity simulation into undergraduate nursing programs to enhance students' knowledge and performance. The high reported heterogeneity may be attributed to variations in study contexts or methodologies. Future research should explore the optimal use of high-fidelity simulation in different educational and cultural contexts.

P-move: a randomized control trial of exercise in patients with advanced pancreatic or biliary tract cancer (aPBC) receiving beyond first-line chemotherapy

PURPOSE

Patients with advanced pancreatic and biliary tract cancer (aPBC) frequently suffer from high symptom burden. Exercise can reduce treatment side effects and improve patient-related outcomes (PROMs). However, evidence from prospective studies regarding feasibility and efficacy in advanced settings are sparse. The primary aim of this prospective, randomized-controlled study was to evaluate the feasibility and effects of exercise (ET) in patients with aPBC.

METHODS

Patients with aPBC beyond first-line therapy were randomized according to the minimization procedure with stratification by gender, age, and loss of body weight in the past six months. The intervention group (IG) completed 3 training units/week for 8 weeks (1x supervised strength sessions, 2x individualized home-based sessions). Control group (CG) received recommendations on physical activity during cancer.

RESULTS

41 patients (stage IV pancreatic or biliary tract cancer) were included no adverse events related to exercise occurred during the trial. Physical function increased significantly in IG in 5 out of 7 physical domains. Comparison of IG and CG at 8 weeks (t2) showed significant differences in favour of IG in leg press (p=0.001), bench press (p=0.011), sit-to-stand (p=0.001) and crunch (0.006). Constipation revealed a significant difference in favour of IG at t2 (p=0.033). Quality of life stabilized/increased in IG during the study period compared to a decrease in CG. Throughout/Over the 8 weeks, fatigue notably reduced in the IG (p=0.028).

CONCLUSION

Exercise is safe and feasible in patients with aPBC undergoing further line therapy. Significant improvements in physical functioning and increased quality of life were achieved. German Clinical Trials Register ID: DRKS00021179; Registration date 15.05.2020.

Prevalence and biopsychosocial indicators of fatigue in cancer patients

INTRODUCTION

Symptoms of cancer-related fatigue (CRF) can have a significant impact on patients' quality of life and treatment adherence. We aimed to investigate the relationship between CRF and multiple psychosocial and somatic indicators within a large mixed cancer sample.

METHODS

In this cross-sectional study, N = 1787 outpatients with cancer were assessed for CRF, pain, anxiety, and depression using validated screening instruments. We further obtained clinical parameters (Hb, CRP, creatinine, leukocytes, ASAT, and ALAT), sociodemographic data (age, gender, income, education level, marital status, parenthood, and living area), and lifestyle factors. Multivariate linear regression models were applied to estimate the impact of each indicator on CRF.

RESULTS

Overall, 90.6% of patients experienced some CRF, with 14.8% experiencing severe CRF. No gender difference was found in the prevalence of CRF. Patients with higher levels of pain, depressive symptoms, and lower Hb levels had significantly higher levels of CRF (ps <0.001). Lower levels of CRF were observed in patients who had children (p = 0.03), had less education (p < 0.001), and were physically active for more than 2 h per week before their oncological diagnosis (p = 0.014). The latter was only a significant indicator in the male subsample.

CONCLUSION

The present results demonstrate a high prevalence of CRF and highlight that not only somatic and psychosocial factors, but also lifestyle factors prior to diagnosis appear to be associated with the etiology and persistence of CRF. To effectively treat CRF, a biopsychosocial, personalized approach is recommended.

Only half of the authors of overviews of exercise-related interventions use some strategy to manage overlapping primary studies-a metaresearch study

OBJECTIVES

The conduct of systematic reviews (SRs) and overviews share several similarities. However, because the unit of analysis for overviews is the SRs, there are some unique challenges. One of the most critical issues to manage when conducting an overview is the overlap of data across the primary studies included in the SRs. This metaresearch study aimed to describe the frequency of strategies to manage the overlap in overviews of exercise-related interventions.

STUDY DESIGN AND SETTING

A systematic search in MEDLINE (Ovid), Embase (Ovid), Cochrane Library, Epistemonikos, and other sources was conducted from inception to June 2022. We included overviews of SRs that considered primary studies and evaluated the effectiveness of exercise-related interventions for any health condition. The overviews were screened by two authors independently, and the extraction was performed by one author and checked by a second. We found 353 overviews published between 2005 and 2022 that met the inclusion criteria.

RESULTS

One hundred and sixty-four overviews (46%) used at least one strategy to visualize, quantify, or resolve overlap, with a matrix (32/164; 20%), absolute frequency (34/164; 21%), and authors' algorithms (24/164; 15%) being the most used methods, respectively. From 2016 onwards, there has been a trend toward increasing the use of some strategies to manage overlap. Of the 108 overviews that used some strategy to resolve the overlap, ie, avoiding double or multiple counting of primary study data, 79 (73%) succeeded. In overviews where no strategies to manage overlap were reported (n = 189/353; 54%), 16 overview authors (8%) recognized this as a study limitation.

CONCLUSION

Although there is a trend toward increasing its use, only half of the authors of the overviews of exercise-related interventions used a strategy to visualize, quantify, or resolve overlap in the primary studies' data. In the future, authors should report such strategies to communicate more valid results.

Exercise Therapy in Oncology—the Impact on Quality of Life and Side Effects

BACKGROUND

The diagnosis and treatment of cancer are highly stressful. Exercise therapy is often used to mitigate the adverse effects of treatment. But how good is the evidence base, and what has changed in recent years? In this narrative review, we present the current data and what it implies for the care of adults with cancer.

METHODS

This review is based on data from meta-analyses and systematic reviews concerning 16 relevant clinical endpoints (outcomes) of exercise therapy for cancer patients.

RESULTS

The literature evaluated for this paper reveals that targeted exercise therapy is feasible and safe under appropriate supervision. It is highly effective for improving eight endpoints (anxiety, depression, fatigue, quality of life, physical function, secondary lymphedema after breast cancer, urinary incontinence, post-mastectomy pain syndrome in breast cancer) and may also have a beneficial effect on sleep quality, cardiotoxicity, and cognitive function. Less conclusive studies are currently available with respect to chemotherapy-induced polyneuropathy, nausea/vomiting, and bone health. There is currently insufficient data to suggest any benefit with respect to sexual function and risk factors for falling.

CONCLUSION

The data shows that exercise therapy for cancer patients is safe and has manifold effects on selected clinically relevant parameters. Further studies should be performed regarding the possible utility of exercise therapy against treatment-related side effects for which the evidence is currently insufficient. On the basis of the currently available and already existing recommendations, quality-assured exercise therapy can be recommended to cancer patients suffering from a wide range of neoplastic conditions.

Microbiome-Modifiers for Cancer-Related Fatigue Management: A Systematic Review

OBJECTIVES

This study systematically investigates the evidence regarding the use of probiotics in managing cancer-related fatigue (CRF).

STUDY DESIGN

We conducted a systematic review of randomized controlled trials.

DATA SOURCES

The systematic search encompassed six databases: PubMed, CINHAL, Cochrane Database of Systematic Reviews, Web of Science, Scopus, and EMBASE, covering the period from inception to December 2023. The assessment of risk of bias employed the Cochrane risk of bias tool (RoB 2). A narrative synthesis and an exploratory meta-analysis were conducted to summarize the evidence.

RESULTS

Among 460 records, three studies met the eligibility criteria and were included in the review. These studies involved a total of 284 participants with colorectal and breast cancer. One study demonstrated a marginal improvement in CRF postchemotherapy in colorectal cancer patients using probiotics. Another study, also using probiotics, reported a significant reduction in CRF among colorectal cancer patients undergoing chemotherapy. Additionally, a study employing synbiotics showed a substantial decrease in CRF severity in breast cancer patients receiving chemotherapy.

CONCLUSION

The study presents initial but varied evidence suggesting the potential of probiotics and synbiotics as adjunctive therapies in managing CRF alongside anticancer treatments.

IMPLICATIONS FOR NURSING PRACTICE

In nursing practice, large-scale clinical trials are urgently needed to evaluate the effectiveness of probiotics in treating cancer-related fatigue during cancer therapy. Insights from this review could guide nurses in selecting appropriate probiotic strains and integrating microbiome modifiers into comprehensive care plans, potentially enhancing the quality of life for cancer patients.

Synbiotics in Oncology: A Scoping Review Protocol on Their Impact and Outcomes in Cancer Care

Symptom management remains challenging in cancer care. Emerging from nutritional science, nutritional metabolomics has seen exponential growth over recent years, aiming to discern the relationship between dietary habits and health consequences. This protocol aims to present the rationale and methodology for conducting a scoping review to summarize the extent of evidence on synbiotics utilization in cancer symptom management among adults. The scoping review will be undertaken in accordance with the Joanna Briggs Institute (JBI) principles and the research process guided by the PRISMA 2020 scoping reviews extension. The following electronic databases will be searched from the inception: PubMed, Cinahl, Web of Science and Scopus. The authors expect to map the literature regarding the clinical outcomes, including patient-report measures and patient-experience measures, on which the effects of probiotics were tested, and identify potential gaps. This protocol presents a rigorous methodological approach to map the literature on the clinical outcomes that the utilization of synbiotics might improve. This analysis will shape future researchers to examine the efficacy of probiotics on specific clinical outcomes in oncology care. Nurses are uniquely positioned to influence cancer symptom management through the selection and use of appropriate interventions in the field of nutritional supplements, along with nutritional counseling.

Effect of a Single Light-intensity Walking Session on Sleep Quality of Patients with Bladder Cancer: A Randomized Cross-Over Study

OBJECTIVES

Exercise has been recommended to enhance sleep. However, there is a paucity of studies investigating the relationships between exercise and sleep problems in patients with bladder cancer. The authors explored the effects of a single bout of light-intensity walking on the sleep quality of patients with bladder cancer who have sleep disorders.

DATA SOURCES

A total of 14 patients with bladder cancer with sleep disorders were recruited for this trial. The participants were randomly assigned to the walking or control condition in a cross-over design to explore the effects of a single light-intensity walking session on objectively measured sleep quality. A two-way repeated measures analysis of variance and a nonparametric permutation test were used to examine intervention effects. Twelve participants (85.7%) completed the trial. A significant group × time interaction for sleep latency (P = .023) was identified. The pairwise comparison showed significant results (P = .012) for the difference between the post-test sleep latency and the pre-test. No significant group × time interactions were observed for the remaining seven sleep parameters. Additionally, only the main effects of time on length of awakening and time in bed were significant (P < .001).

CONCLUSION

A single bout of light-intensity walking has a positive effect on shortening the sleep latency of patients with bladder cancer who have sleep disorders.

IMPLICATIONS FOR NURSING PRACTICE

Oncology nurses can encourage patients with bladder cancer to exercise, even light-intensity walking, which may improve sleep quality.

Impact of Exercise Interventions on Sustained Brain Health Outcomes in Frail Older Individuals: A Comprehensive Review of Systematic Reviews

Several systematic review studies highlight exercise's positive impact on brain health outcomes for frail individuals. This study adopts a Comprehensive Review of reviews (CRs) approach to amalgamate data from existing reviews, focusing on exercise's influence on brain health outcomes in older frail and pre-frail adults. The methodology involves a thorough search of Portuguese, Spanish, and English-indexed databases (i.e., Ebsco Health, Scielo, ERIC, LILACS, Medline, Web of Science, SportDiscus) from 1990 to 2022, with the AMSTAR-2 tool assessing evidence robustness. The search terms "physical exercise", "elderly frail", and "systematic review" were employed. Results: Out of 12 systematically reviewed studies, four presented high-quality (with metanalyses), while eight exhibit critically low quality. Positive trends emerge in specific cognitive and neuromotor aspects, yet challenges persist in psychosocial domains, complex cognitive tasks, and ADL outcomes. This study yields reasonable and promising evidence regarding exercise's influence on quality of life and depression in frail older individuals. However, the impact on biochemical markers remains inconclusive, emphasizing the need for standardized methodologies. Conclusions: The findings highlight the importance of acknowledging methodological nuances for clinicians and policymakers when translating these results into impactful interventions for aging populations. This emphasizes the necessity for a comprehensive and customized approach to exercise interventions aimed at fostering the sustainability of overall well-being in older individuals, aligning with United Nations Sustainable Development Goal 3.

Cancer-Related Fatigue in Head and Neck Cancer Survivors: Longitudinal Findings from the Head and Neck 5000 Prospective Clinical Cohort

Cancer-related fatigue (CRF) is a common side-effect of cancer and its treatments. For head and neck cancer (HNC), CRF may exacerbate the symptom burden and poor quality-of-life. Using data from the Head and Neck 5000 prospective clinical cohort, we investigated clinically important CRF over a year post-diagnosis, assessing temporal trends, CRF by HNC site and treatment received, and subgroups at higher risk of CRF. Recruitment was undertaken in 2011-2014. Socio-demographic and clinical data, and patient-reported CRF (EORTC QLQ-C30 fatigue subscale score ≥39 of a possible 100) were collected at baseline (pre-treatment) and 4- and 12- months post-baseline. Mixed-effects logistic multivariable regression was used to investigate time trends, compare cancer sites and treatment groups, and identify associations between clinical, socio-demographic and lifestyle variables and CRF. At baseline, 27.8% of 2847 patients scored in the range for clinically important CRF. This was 44.7% at 4 months and 29.6% at 12 months. In the multivariable model, after adjusting for time-point, the odds of having CRF over 12 months were significantly increased in females and current smokers; those with stage 3/4 disease, comorbidities and multimodal treatment; and those who had depression at baseline. The high prevalence of clinically important CRF indicates the need for additional interventions and supports for affected HNC patients. These findings also identified patient subgroups towards whom such interventions could be targeted.

Association of post-stroke fatigue with physical activity and physical fitness: A systematic review and meta-analysis

BACKGROUND

It has been hypothesized that post-stroke fatigue (PSF) is associated with reduced physical activity (PA) and impaired physical fitness (fitness). Understanding associations between PSF and PA, and/or fitness could help guide the development of targeted exercise interventions to treat PSF.

AIMS

Our systematic review and meta-analysis aimed to investigate PSF's associations with PA and fitness.

SUMMARY OF REVIEW

Following a registered protocol, we included studies with cross-sectional or prospective observational designs, published in English or a Scandinavian language, which reported an association of PSF with PA and/or fitness in adult stroke survivors. We searched MEDLINE, Embase, AMED, CINAHL, PsycINFO, ClinicalTrials.gov, and World Health Organization's International Clinical Trials Registry Platform from inception to November 30, 2022. Risk of bias was assessed using Quality in Prognosis Studies. Thirty-two unique studies (total n = 4721 participants, 55% male), and three study protocols were included. We used random-effects meta-analysis to pool data for PA and fitness outcomes, and vote-counting of direction of association to synthesize data that could not be meta-analyzed. We found moderate-certainty evidence of a weak association between higher PSF and impaired fitness (meta r = -0.24; 95% confidence interval (CI) = -0.33, -0.15; n = 905, 7 studies), and very low-certainty evidence of no association between PSF and PA (meta r = -0.09; 95% CI = -0.34, 0.161; n = 430, 3 studies). Vote-counting showed a higher proportion of studies with associations between higher PSF and impaired fitness (pˆ = 0.83; 95% CI = 0.44, 0.97; p = 0.22, n = 298, 6 studies), and with associations between higher PSF and lower PA (pˆ = 0.75; 95% CI = 0.51, 0.90; p = 0.08, n = 2566, 16 studies). Very low- to moderate-certainty evidence reflects small study sample sizes, high risk of bias, and inconsistent results.

CONCLUSIONS

The meta-analysis showed moderate-certainty evidence of an association between higher PSF and impaired fitness. These results indicate that fitness might protect against PSF. Larger prospective studies and randomized controlled trials evaluating the effect of exercise on PSF are needed to confirm these findings.

Effectiveness of physical activity interventions on reducing perceived fatigue among adults with chronic conditions: a systematic review and meta-analysis of randomised controlled trials

Fatigue is barrier of physical activity participation in adults with chronic conditions. However, physical activity alleviates fatigue symptoms. This systematic review and meta-analysis aimed to (1) synthesise evidence from randomised controlled trials (RCTs) exploring the effects of physical activity interventions on fatigue reduction and (2) evaluate their effectiveness. Medline/CINAHL/EMBASE/Web of Science and Scopus were searched up to June 24th, 2023. Two reviewers independently conducted study screening and selection (RCTs), extracted data and assessed risk of bias (RoB2). Outcome was the standardised mean difference (SMD) with 95% confidence intervals in fatigue between experimental and control groups. 38 articles met the inclusion criteria. Overall, physical activity interventions moderately reduced fatigue (SMD = 0.54, p < 0.0001). Interventions lasting 2-6 weeks demonstrated a larger effect on fatigue reduction (SMD = 0.86, p < 0.00001). Interventions with 18-24 sessions showed a large effect on fatigue reduction (SMD = 0.97, p < 0.00001). Aerobic cycling and combination training interventions had a large to moderate effect (SMD = 0.66, p = 0.0005; SMD = 0.60, p = 0.0010, respectively). No long-term effects were found during follow-up. Physical activity interventions moderately reduced fatigue among adults with chronic conditions. Duration, total sessions, and mode of physical activity were identified as key factors in intervention effectiveness. Further research is needed to explore the impact of physical activity interventions on fatigue.

Effects of High-Intensity Interval Training and Combined High-Intensity Interval Training Programs on Cancer-Related Fatigue and Cancer Pain: A Systematic Review and Meta-analysis

PURPOSE

This systematic review and meta-analysis assessed the effectiveness of high-intensity interval training (HIIT) alone and combined HIIT programs compared with usual care on cancer-related fatigue (CRF) and pain related to cancer or cancer-related treatments.

METHODS

Articles published prior to January 2023 were searched in the following digital databases: PubMed, Cochrane Database of Systematic Reviews and Cochrane Controlled Clinical Trials (CENTRAL), Web of Science, Scopus and ScienceDirect. Randomized controlled trials were included that met the following criteria: (i) adult cancer patients and survivors (>18 yr old); (ii) HIIT or combined HIIT programs versus usual care; (iii) assessment of fatigue and pain. Cochrane tool was used for assessing Risk of Bias (RoB) and Review Manager (RevMan 5.2) was used for data analysis.

RESULTS

Based on limited number (12) of studies included, we found HIIT and combined HIIT interventions have significant effect sizes on reducing both CRF (standardized mean difference, 0.63; 95% confidence interval, 0.42-0.84; P < 0.001) and cancer-associated pain (standardized mean difference, 0.44; 95% confidence interval, 0.25-0.63; P < 0.001).

CONCLUSIONS

This systematic review and meta-analysis indicate that HIIT and combined HIIT programs can reduce CRF and pain.

Physical Activity Levels in People with Cancer Undergoing Chemotherapy: A Systematic Review

OBJECTIVES

Physical activity (PA) has been shown to improve chemotherapy side effects, survival rates and treatment adherence in people with cancer. This review aimed to identify whether people undergoing chemotherapy in different exercise interventions meet PA guidelines during chemotherapy.

DATA SOURCES

Databases searched were CINAHL complete, PubMed, Cochrane Library, EMBASE, AMED, Joanna Briggs Institute, OVID MEDLINE, and Google Scholar. Eligibility and risk-of-bias were reviewed by two authors. PROSPERO registration: CRD42018093839.

CONCLUSION

Thirty-three studies were eligible (14 randomized controlled trials, six pre-post, and 13 cross-sectional studies), which included 2,722 people with cancer undergoing chemotherapy. Studies (n = 11/13) found PA interventions successfully increased or maintained PA participation levels, whereas PA declined without intervention. This review has identified that due to limited evidence it is not possible to determine the most appropriate intervention to improve PA for people undergoing chemotherapy. Despite the well-documented benefits of PA, most people undergoing chemotherapy do not achieve the PA guidelines. Clinicians should be aware that during treatment, participants may not meet PA guidelines even if they participate in an intervention. However, interventions may prevent PA levels from declining. Further research is required to determine the most effective approaches to increase PA levels while undergoing chemotherapy.

IMPLICATIONS FOR NURSING PRACTICE

Nurses are well placed to have conversations with patients undergoing chemotherapy regarding PA levels. PA should be considered as part of a treatment regimen. Tailored advice must be provided aiming to improve health outcomes. Referral to an exercise professional is best practice to improve the uptake of PA.

Non-pharmacologic interventions for improving cancer-related fatigue (CRF): A systematic review of systematic reviews and pooled meta-analysis

INTRODUCTION

Literature encloses numerous systematic reviews (SRs) on nonpharmacologic interventions for improving cancer-related fatigue (CRF). The effect of these interventions remains controversial, and the available SRs have not been synthesized yet. We conducted a systematic synthesis of SRs and meta-analysis to determine the effect of nonpharmacologic interventions on CRF in adults.

MATERIAL AND METHODS

We systematically searched 4 databases. The effect sizes (standard mean difference) were quantitatively pooled using a random-effects model. Chi-squared (Q) and I-square statistics (I²) tested the heterogeneity.

RESULTS

We selected 28 SRs, including 35 eligible meta-analyses. The pooled effect size (standard mean difference, 95% CI) was -0.67 (-1.16, -0.18). The subgroup analysis by types of interventions showed a significant effect in all the investigated approaches (complementary integrative medicine, physical exercise, self-management/e-health interventions).

CONCLUSIONS

There is evidence that nonpharmacologic interventions are associated with CRF reduction. Future research should focus on testing these interventions on specific population clusters and trajectories.

PROSPERO REGISTRATION

CRD42020194258.

Effectiveness of exercise interventions in the management of cancer-related fatigue: a systematic review of systematic reviews

BACKGROUND

Cancer-related fatigue is a widely prevalent global public health concern with serious consequences. Increasing evidence suggests the effectiveness of exercise intervention in treating cancer-related fatigue, but there is a lack of a summary of relevant literature on the same to help reach a clear consensus.

OBJECTIVE

To summarize evidence regarding the efficacy of exercise interventions to reduce cancer fatigue, as determined in systematic reviews (SRs) and/or meta-analyses (MAs).

METHOD

From inception to September 2022, PubMed (1948-2022), Embase (1974-2022), Cochrane Library (1993-2022), CINAHL (1937-2022), Web of Science (1997-2022), China Knowledge Resource Integrated Database (1999-2022), Wanfang Database (1993-2022), and Chinese Biomedical Database (1994-2022) were searched for inclusion to the study. Two reviewers independently extracted the data from the included articles. AMSTAR II was to evaluate the methodological quality of the reviews.

RESULTS

A total of 46 systematic reviews were assessed for data on exercise intervention in reducing cancer-related fatigue among cancer patients. In addition, some studies have reported adverse events during the exercise intervention period. The quality of the included systematic review was found to be low or critically low.

CONCLUSIONS

The present systematic review of systematic reviews supports exercise intervention for reducing cancer-related fatigue. Further higher-quality studies are warranted to improve the level of evidence for exercise interventions for application in the treatment of cancer-related fatigue.

Long Term Effects of a Social Capital-Based Exercise Adherence Intervention for Breast Cancer Survivors With Moderate Fatigue: A Randomized Controlled Trial

OBJECTIVES

This study reports on the long-term effects of the Better Life After Cancer: Energy, Strength, and Support (BLESS) program, a 12-week social capital-based exercise adherence program for breast cancer survivors (BCS), implemented using a randomized controlled trial design. The study investigated outcomes related to cancer-related fatigue (CRF), quality of life (QOL), physical activity, depression, anxiety, sleep quality, and social capital.

METHODS

Participants who had moderate or greater CRF were randomly assigned to the intervention (n = 24), consisting of supervised and home-based exercise, or the control (n = 26), who received exercise leaflets. Generalized estimating equations models were fitted for the outcome variables. The assessment points were baseline (M1), immediately after completing the intervention at 12 weeks (M2), 1 month (M3), and 6 months post-intervention (M4).

RESULTS

A significant reduction in the total CRF score was found for both groups. We observed a significant time by group effect at M2, indicating a reduction of behavioral/severity CRF scores and a higher increase of physical activity. Also, there was an increase in the QOL score of both groups at M2, M3, and M4, compared to M1. Both groups had reduced anxiety at M3 and M4 compared to M1. The time by group effect for depression, sleep quality and social capital was not statistically significant.

CONCLUSION

This 12-week exercise adherence program improved behavioral/severity CRF and physical activity post-intervention. Both the experimental group and control group showed significant improvements in CRF, QOL, and anxiety domains compared to the baseline, which extended to 6 months post-intervention.

TRIAL REGISTRATION

Korean Clinical Research Information Service (KCT0005763).

Evaluation of a city-wide physical activity pathway for people affected by cancer: the Active Everyday service

PURPOSE

The primary goal of this article is to present an evaluation of a UK-based city-wide physical activity pathway for patients with a cancer diagnosis, the Active Everyday service. Active Everyday was a co-produced physical activity service for people affected by cancer. The service was underpinned by a behaviour change care pathway model developed by Macmillan Cancer Support charity.

METHODS

This was a retrospective evaluation assessing physical activity levels and changes to outcome measures (fatigue, perceived health, and self-efficacy) over 6 months. Each participant self-reported their levels of physical activity for the previous 7 days at three-time points: baseline (T1), at 12-week exit from the scheme (T2), and at 6-month follow-up (T3).

RESULTS

The Active Everyday service received 395 referrals, of which 252 attended a baseline assessment. Participants' fatigue and self-efficacy improved between T1 and T2 and T1 and T3. Perceived health improved across all time points. Participant exercise levels showed significant differences between T1 and T2.

CONCLUSION

The service, provided over 3 years, resulted in positive health and wellbeing outcomes in people affected by cancer who engaged in the service. Future services must routinely include exercise referrals/prescriptions as a standard part of care to help engage inactive individuals. Services should focus on targeted promotion to people from ethnic minority groups, and a wide socioeconomic population.

Beneficial Exercises for Cancer-Related Fatigue among Women with Breast Cancer: A Systematic Review and Network Meta-Analysis

CONTEXT

Cancer-related fatigue (CRF) is the most common cause of physical powerlessness in women with breast cancer (BC). The practice of continuous effective exercise is beneficial with respect to reducing CRF.

OBJECTIVE

To explore exercise efficacy and respective ranks with respect to reducing CRF in women with BC within the inter-treatment and post-treatment periods.

METHODS

Throughout this systematic review and network meta-analysis, articles published from 2000 to March 2022 were included. Article searches were conducted on the MEDLINE, Embase, CINAHL, and CENTRAL databases. Adult women with BC and different exercise programs were compared with those involved in regular care as a control during or after treatment. In addition, randomized controlled trials (RCT) were also included. A risk-of-bias assessment, with the revised Cochrane risk-of-bias tool regarding RCT and probability-based ranking, was established based on the surface under the cumulative rank (SUCRA) method via network meta-analysis.

RESULTS

a total of 5747 women with BC followed seven exercise interventions. Yoga (SMD = -0.54, 95% CI [-0.86, -0.22]) was ranked first (94.5%), with significant effects in respect of mitigating CRF, followed by resistance exercise (66.2%), and aerobic resistance (63.3%), while Qigong ranked last (22.2%) among the 36 RCT in inter-treatment. Aerobic resistance exercise (SMD = -0.52, 95% CI [-0.98, -0.07]) induced significant effects in respect of mitigating CRF in the 38 RCTs in the post-treatment period. Yoga, aerobic yoga, and aerobic resistance exercise ranked as the top three (75.5%, 75.0%, and 72.4%, respectively), whereas relaxation ranked last (38.8%) in the post-treatment period.

CONCLUSION

Yoga, aerobic resistance, and aerobic yoga are recommended for the purposes of inter- and post-treatment exercise to reduce CRF in women with BC by enhancing their physical resilience and long-term quality of life.

Effects of exercise interventions on cancer-related fatigue in breast cancer patients: an overview of systematic reviews

OBJECTIVE

This overview of systematic reviews aims to critically appraise and consolidate evidence from current systematic reviews (SRs)/meta-analyses on the effects of exercise interventions on cancer-related fatigue (CRF) in breast cancer patients.

METHODS

SRs/meta-analyses that explored the effects of exercise interventions on CRF in breast cancer patients compared with the routine methods of treatment and care were retrieved from nine databases. The methodological quality of the included SRs was appraised using A MeaSurement Tool to Assess systematic Reviews II (AMSTAR II). The Grading of Recommendations Assessment, Development and Evaluation (GRADE) was used to calculate the grading of outcomes in the included SRs. The exercise type, frequency, duration, and inclusion/absence of supervision were further evaluated with subgroup analyses. The Stata 16.0 software was utilized for data analysis.

RESULTS

Twenty-nine reviews were included. The overall methodological quality and level of evidence of the included reviews were unsatisfactory, with only three reviews rated as high methodological quality and no review identified as high-quality evidence. Moderate certainty evidence indicated that exercise could improve fatigue in breast cancer patients (SMD = - 0.40 [95%CI - 0.58, - 0.22]; P = 0.0001). Subgroup analysis based on the types of exercise showed that yoga (SMD = - 0.30 [95%CI - 0.56, - 0.05]; I2 = 28.7%) and aerobic exercise (SMD = - 0.29 [95%CI - 0.56, - 0.02]; I2 = 16%) had a significantly better effect on CRF in breast cancer patients; exercising for over 6 months (SMD = - 0.88 [95%CI - 1.59, - 0.17]; I2 = 42.7%; P = 0.0001), three times per week (SMD = - 0.77 [95%CI - 1.04, - 0.05]; I2 = 0%; P = 0.0001), and for 30 to 60 min per session (SMD = - 0.81 [95%CI - 1.15, - 0.47]; I2 = 42.3%; P = 0.0001) can contribute to a moderate improvement of CRF. Supervised exercise (SMD = - 0.48 [95%CI - 0.77, - 0.18]; I2 = 87%; P = 0.001) was shown to relieve CRF.

CONCLUSION

Exercise played a favorable role in alleviating CRF in breast cancer. Yoga was recommended as a promising exercise modality for CRF management in the majority of the included studies. Exercising for at least three times per week with 30 to 60 min per session could be recommended as a suitable dosage for achieving improvement in CRF. Supervised exercise was found to be more effective in alleviating CRF than unsupervised exercise. More rigorously designed clinical studies are needed to specify the exact exercise type, duration, frequency, and intensity to have an optimal effect on CRF in breast cancer patients.

TRIAL REGISTRATION

ClinicalTrials.gov Identifier: CRD42020219866.

Developing practice guidelines to integrate physical activity promotion as part of routine cancer care: A knowledge-to-action protocol

Background

Cancer is a leading cause of disease burden worldwide and the first cause of mortality in Canada with 30.2% of deaths attributable to cancer. Given aging of the population and the improvement of prevention and treatment protocols, the number of cancer survivors is steadily increasing. These individuals have unique physical and mental health needs some of which can be addressed by integrating physical activity promotion into ongoing and long-term care. Despite the benefits of being active, delivery of PA programs for cancer patients in both clinical and community settings remains challenging. This knowledge-to-action protocol–called Kiné-Onco–aims to develop a practice guideline for the delivery, implementation, and scaling-up of cancer-specific physical activity promotion programs and services in clinical and community settings located in Québec, Canada.

Method

The Kiné-Onco project involves knowledge synthesis of scientific and grey literature to establish the benefits and added value of physical activity for cancer patients and survivors, describes current practices in delivering physical activity programs, analyses quantitative data from electronic health records (EHR) of patients participating in a novel hospital-based physical activity program, collects and analyses qualitative data from patients and healthcare providers interviews about lived experience, facilitators, and barriers to physical activity promotion, outlines deliberative workshops among multidisciplinary team members to develop implementation guidelines for physical activity promotion, and summarizes a variety of knowledge transfer and exchange activities to disseminate the practice guidelines.

Discussion

This paper describes the protocol for a knowledge-to-action project aimed at producing and sharing actionable evidence. Our aim is that physical activity promotion programs and services be scaled up in such a way as to successfully integrate physical activity promotion throughout cancer treatment and survivorship in order to improve the physical and mental health of the growing population of individuals having received a cancer diagnosis.

Psycho-oncology interventions focusing on fatigue and sleep disturbances

PURPOSE OF REVIEW

Cancer-related fatigue (CRF) and sleep disturbances are common symptoms among patients with cancer. They are often conceptualized as a part of a larger symptom cluster, also comprising pain and emotional distress. Despite their prevalence and long-lasting effects, CRF and sleep disturbances are still poorly addressed in clinical settings. Specific interventions are needed to manage these symptoms.

RECENT FINDINGS

In addition to conventional pharmacological therapies, other kinds of interventions are increasingly being developed in oncology. This review will discuss three categories of interventions for patients with cancer and their interest in alleviating CRF and sleep disturbances: physical exercises (e.g., aerobic, resistance training, running, free weights), psychological interventions (e.g., cognitive-behavioural therapy, psychoeducational interventions), and mind-body interventions (e.g., yoga, mindfulness, hypnosis). The multicomponent aspect of these interventions seems particularly important to address these symptoms.

SUMMARY

The findings detailed in this review will allow the scientific community, as well as health professionals working in oncology settings, to be informed about new nonpharmacological therapeutic options to help patients to manage their symptoms. It could eventually help to improve existing interventions for these patients.

Current Resources for Evidence-Based Practice, March 2022

An extensive review of new resources to support the provision of evidence-based care for women and infants. The current column includes a discussion of systemic racism and its effect on maternal health in the United States and commentaries on reviews focused on barriers and facilitators to HPV vaccination and delayed cord clamping in preterm infants.

Astragalus membranaceus (Huang Qi) for cancer-related fatigue: A protocol for systematic review and meta-analysis

BACKGROUND

Cancer-related fatigue (CRF) is one of the most common complications of cancer. The incidence of CRF is higher than 80%. The NCCN describes it as a distressing, persistent, subjective sense of physical, emotional, and/or cognitive tiredness or exhaustion. It exists in cancer treatment and may last for months or even years. CRF seriously impairs patients' quality of life. However, there is still a lack of effective drug treatment. Astragalus can improve patients' fatigue state in the clinical practice of Chinese medicine. There are some studies on the treatment of CRF with Astragalus-containing prescription. However, there is no comprehensive analysis of them. We will perform a meta-analyze on the therapeutic effect of Astragalus-containing prescription for CRF.

METHODS

We will search China National Knowledge Infrastructure, Chinese Scientific Journal Database, Chinese Biomedical Literature Database, Wanfang Database, EMBASE, MEDLINE, and the Cochrane Registry of Controlled Clinical Trials. The information is from the databases' inception to December 15, 2021. According to the Cochrane Handbook for Systematic Reviews of Interventions, data extraction and processing are carried out. Review Manager 5.4 is used for meta-analysis.

RESULTS

We will take the severity of CRF as the primary outcome.

CONCLUSIONS

We will conduct a meta-analysis to evaluate the efficacy of Astragalus-containing prescriptions in treating CRF.

Exercise-Induced Extracellular Vesicles Delay the Progression of Prostate Cancer

Increasing evidence suggests that regular physical exercise not only reduces the risk of cancer but also improves functional capacity, treatment efficacy and disease outcome in cancer patients. At least partially, these effects are mediated by the secretome of the tissues responding to exercise. The secreted molecules can be released in a carrier-free form or enclosed into extracellular vesicles (EVs). Several recent studies have shown that EVs are actively released into circulation during physical exercise. Here, we for the first time investigated the effects of exercise-induced EVs on the progression of cancer in an F344 rat model of metastatic prostate cancer. Although we did not observe a consistent increase in the circulating EV levels, RNA sequencing analysis demonstrated substantial changes in the RNA content of EVs collected before and immediately after forced wheel running exercise as well as differences between EVs from runners at resting state and sedentary rats. The major RNA biotype in EVs was mRNA, followed by miRNA and rRNA. Molecular functions of differentially expressed RNAs reflected various physiological processes including protein folding, metabolism and regulation of immune responses triggered by the exercise in the parental cells. Intravenous administration of exercise-induced EVs into F344 rats with orthotopically injected syngeneic prostate cancer cells PLS10, demonstrated reduction of the primary tumor volume by 35% and possibly—attenuation of lung metastases. Hence, our data provide the first evidence that exercise-induced EVs may modulate tumor physiology and delay the progression of cancer.