Mindfulness-based Interventions Across the Cancer Continuum in the United States: A Scoping Review

OBJECTIVE

To review mindfulness-based interventions (MBIs) tested in randomized controlled trials (RCT) across the cancer continuum.

DATA SOURCE

Articles identified in PubMed, CINAHL, Web of Science, PsycINFO, and Embase.

STUDY INCLUSION AND EXCLUSION CRITERIA

Two independent reviewers screened articles for: (1) topic relevance; (2) RCT study design; (3) mindfulness activity; (4) text availability; (5) country (United States); and (6) mindfulness as the primary intervention component.

DATA EXTRACTION

Twenty-eight RCTs met the inclusion criteria. Data was extracted on the following variables: publication year, population, study arms, cancer site, stage of cancer continuum, participant demographic characteristics, mindfulness definition, mindfulness measures, mindfulness delivery, and behavioral theory.

DATA SYNTHESIS

We used descriptive statistics and preliminary content analysis to characterize the data and identify emerging themes.

RESULTS

A definition of mindfulness was reported in 46% of studies and 43% measured mindfulness. Almost all MBIs were tested in survivorship (50%) or treatment (46%) stages of the cancer continuum. Breast cancer was the focus of 73% of cancer-site specific studies, and most participants were non-Hispanic white females.

CONCLUSION

The scoping review identified 5 themes: (1) inconsistency in defining mindfulness; (2) differences in measuring mindfulness; (3) underrepresentation of racial/ethnic minorities; (4) underrepresentation of males and cancer sites other than breast; and (5) the lack of behavioral theory in the design, implementation, and evaluation of the MBI.

The effect of mindfulness-based interventions on biomarkers in cancer patients and survivors: A systematic review

Various reviews and meta-analyses have shown the positive effects of mindfulness-based interventions (MBIs) on the mental health of cancer patients and survivors. Some studies have also investigated the impact of MBIs on physiological markers of health in oncology, but a systematic review has not been conducted in this field. The current paper aims to fill this gap in the literature. Following preferred reporting items for systematic reviews and meta-analyses 2020 guidelines, data were obtained from the databases of Pubmed, Scopus, Web of Science in May 2022. Twenty-five studies were included. Globally, 35 biomarkers were employed in these studies and were categorized 8 groups (cortisol; blood pressure (BP), heart rate, and respiratory rate; C-reactive protein; telomere length and telomerase activity (TA); genetic signature; cytokines and hormones; leucocyte activation; leucocyte count and cell subpopulation analysis). In seven of these categories of biomarkers, positive effects of MBIs were observed. The most promising results were obtained for cortisol, BP, TA and pro-inflammatory gene expression. However, the generally low number of studies per single biomarker limits the possibility to draw reliable conclusions. The present review presents a comprehensive state-of-the-art for MBIs in oncology on biomarkers, confirming MBIs' potential for improving physiological health in cancer patients and survivors besides those already shown in literature on psychological well-being.

Mindfulness-based therapies for cancer patients and families: a systematic review

BACKGROUND

Mindfulness-based therapies (MBTs) addressed to patients with cancer have been widely studied in the last two decades, and their efficacy has been systematically reviewed and meta-analysed. Although findings from literature highlight benefits of MBTs on several patients' health outcomes, these should be appraised taking into consideration the characteristics of the selected studies. In this systematic review, we summarised the current evidence of the efficacy of MBTs in improving the quality of life of both patients with cancer and their relatives, with a focus on the methodological quality, type of MBT evaluated and population involved in existing randomised controlled trials (RCTs).

METHODS

We searched English language articles published until February 2021. Couples of authors independently applied inclusion criteria and extracted findings. Thirty RCTs were included.

RESULTS

Nearly half of the studies were performed in English-speaking countries outside of Europe, with females diagnosed with breast cancer. Most considered heterogeneous phases of illness; one study only was performed on relatives. In most cases, different measures were employed to evaluate the same outcome. The efficacy of MBTs has been demonstrated in 25 of the 30 included articles. The methodological quality of RCTs was acceptable.

CONCLUSION

The heterogeneity of studies' characteristics makes findings on the efficacy of MBTs poorly informative with reference to different clinical and cancer-related psychological conditions. Studies on more homogeneous samples by cancer site and phase, as well as performed in different cultural contexts, could provide a basis for better evaluating and targeting MBTs' protocols for the specific needs of patients with cancer and their relatives.

Mind-Body Therapies for Sleep Disturbance among Patients with Cancer: A Systematic Review and Meta-analysis

OBJECTIVE

s: To assess whether mind-body therapies (MBTs) are effective for relieving sleep disturbance among patients with cancer.

DESIGN

Systematic review and meta-analysis of randomized controlled trials (RCTs).

METHODS

Seven English electronic databases were searched from the date of inception to September 2022. All RCTs that included adults (≥18 years) who were treated with mindfulness, yoga, qigong, relaxation, and hypnosis were screened. The outcome was subjective and/or objective sleep disturbance.The revised Cochrane tool (RoB 2.0) was applied to evaluate the risk of bias. The RevMan software was applied to assessed each outcome according different control groups and assessment time points. Subgroup analyses were performed according to different categories of MBTs.

RESULTS

Sixty-eight RCTs (6339 participants) were identified. After requesting for missing data from corresponding authors of included RCTs, 56 studies (5051 participants) were included in the meta-analysis. The meta-analysis showed a significant immediate effect of mindfulness, yoga, relaxation, and hypnosis on subjective sleep disturbance, compared with usual care or wait list control, and the effect of mindfulness lasted at least 6 months. For objective sleep outcomes, we observed significant immediate effects of yoga on wake after sleep onset and of mindfulness on sleep onset latency and total sleep time. Compared with active control interventions, MBTs had no significant effect on sleep disturbance.

CONCLUSIONS

Mindfulness, yoga, relaxation, and hypnosis were effective in sleep disturbance severity reduction among patients with cancer at post-intervention, and the effect of mindfulness lasted at least 6 months. Future MBTs studies should apply both objective and subjective sleep measurement tools.

The effects of mindfulness-based intervention on sleep disturbance and benzodiazepine hypnotics use in patients hospitalized with cancer: A systematic review and meta-analysis

Previous studies have reported discrepant outcomes for mindfulness-based intervention (MBI) to improve sleep quality or reduce the benzodiazepines (BZDs) use in cancer patients; therefore, a meta-analysis was required to examine the relationships. The MEDLINE, EMBASE, CINAHL, PsycINFO, Web of Science, Cochrane Central Register of Controlled Trials et al. were searched by independent reviewers from date of inception to January 2020 to examine the associations between MBI and sleep disturbance or BZDs use among cancer patients. Randomized controlled studies that reported the effect of MBI on sleep disturbance or BZDs use in cancer patients aged over 18 years were included. Standardized mean differences with 95% CIs were calculated to estimate effect size. If P ≥ 0.1, I² < 50%, the fixed effect model was used for meta-analysis, while if P < 0.1, I² ≥ 50%, the random effects model was used. Fourteen studies of 1659 participant were identified in the meta-analysis. Overall, sleep disturbance was significantly relieved in MBI group (SMD = 0.37, 95% CI 0.19 to 0.55, P < 0.001), and the effect could sustain to follow up duration (SMD = 0.35, 95% CI 0.02 to 0.69, P < 0.001). Only three studies reported that MBI could decrease the BZDs use in hospitalized cancer patients. Our findings indicate that MBI were effective in alleviating sleep disturbance in a short time, and may be associated with therapeutic benefits for BZDs use. Further randomized controlled studies are needed to examine the effectiveness of MBI for BZDs use in cancer patients.

Effects of mindfulness-based interventions on fatigue in cancer survivors: A systematic review and meta-analysis of randomized controlled trials

This systematic review and meta-analysis was designed to determine the efficacy of mindfulness-based interventions (MBIs) in improving fatigue-related outcomes in adult cancer survivors. Randomized controlled trials (RCTs) were identified from PubMed, MEDLINE, PsycINFO, CINAHL, Web of Science, and EMBASE databases and reference lists of included studies. Separate random-effects meta-analyses were conducted for fatigue and vitality/vigor. Twenty-three studies reporting on 21 RCTs (N = 2239) met inclusion criteria. MBIs significantly reduced fatigue compared to controls at post-intervention (g = 0.60, 95 % CI [0.36, 0.83]) and first follow-up (g = 0.42, 95 % CI [0.20, 0.64]). Likewise, MBIs significantly improved vitality/vigor at post-intervention (g = 0.39, 95 % CI [0.25, 0.52]) and first follow-up (g = 0.35, 95 % CI [0.03, 0.67]). The evidence grade was low due to risk of bias, substantial heterogeneity, and publication bias among studies. MBIs show promise in improving fatigue and vitality/vigor in cancer survivors. More rigorous trials are needed to address current gaps in the evidence base.

The mindfulness-based stress reduction program for improving sleep quality in cancer survivors: A systematic review and meta-analysis

INTRODUCTION

This study aims to evaluate the efficacy and effectiveness of a mindfulness-based stress reduction (MBSR) program in improving sleep in cancer survivors.

METHODS

Four electronic databases (Cochrane Library, EMBASE, PubMed, and PsycARTICLES) were searched for randomized controlled trials evaluating the effects of MBSR on the sleep of cancer survivors from their inception to May 2020. The primary outcome was sleep quality measured by validated questionnaires such as the Insomnia Severity Index and Pittsburgh Sleep Quality Index. The secondary outcomes were sleep parameters obtained from a sleep diary, polysomnography, and actigraphy. The included studies were critically appraised by the Cochrane risk of bias tool and meta-analyzed.

RESULTS

Ten studies were included, and nine studies were analyzed quantitatively. MBSR significantly improved sleep quality compared to usual care (standardized mean difference -0.29, 95 % confidence interval -0.55 to -0.04, I² = 58 %). However, there were no favorable results with sleep parameters. Compared to active controls, MBSR presented mixed results with sleep quality according to the outcomes and negative results with sleep parameters.

CONCLUSION

This review suggests that MBSR helps cancer survivors improve sleep quality. Our results support the possibility of using MBSR for cancer survivors. However, its efficacy and effectiveness in improving sleep quality and sleep parameters are inconclusive because the number of included studies was few with inconsistent results. Further studies with high methodological quality are required to establish conclusive evidence about the efficacy and effectiveness of MBSR in improving sleep quality and sleep parameters in cancer survivors.

Exploring the perceptions of cancer survivors of a mindfulness intervention at a tertiary hospital in Singapore: a descriptive qualitative study

BACKGROUND

Cancer survivors often experience physical and psychological symptoms that may affect their daily activities and quality of life. A mindfulness-based psychoeducation for cancer survivors, (MindCAN) program, has been established to help cancer survivors manage their physical and psychological symptoms. This study aimed to explore perceptions of participants who attended the MindCAN program.

METHODS

A descriptive qualitative study was conducted at a tertiary hospital in Singapore. Purposive sampling was used to recruit adult cancer survivors. They attended the MindCAN program that was conducted once a week for 8 weeks, comprising education and mindfulness practice. Two focus group interviews were conducted to elicit the participants' perceptions of the program. The interviews were audio-recorded and transcribed verbatim. A thematic analysis was performed to identify essential themes and subthemes. Trustworthiness, including creditability, confirmability, dependability, and transferability were ascertained.

RESULTS

A total of 13 participants were recruited. Most of whom were Chinese, female, and single. The participants' perceptions were documented in five major themes: heightened awareness of the self, enriching body experiences through mindfulness practice, cultivating powerful minds and positive emotions, integrating mindfulness to daily life, and embracing interpersonal mindfulness.

CONCLUSION

Overall, the MindCAN program received positive comments from cancer survivors. They reported increased self-awareness, pleasant body experiences, positive thinking and emotions, and relaxation. Future research is required to test the effectiveness of the program.

Association of Mindfulness-Based Interventions With Anxiety Severity in Adults With Cancer: A Systematic Review and Meta-analysis

IMPORTANCE

Mindfulness-based interventions (MBIs), grounded in mindfulness, focus on purposely paying attention to experiences occurring at the present moment without judgment. MBIs are increasingly used by patients with cancer for the reduction of anxiety, but it remains unclear if MBIs reduce anxiety in patients with cancer.

OBJECTIVE

To evaluate the association of MBIs with reductions in the severity of anxiety in patients with cancer.

DATA SOURCES

Systematic searches of MEDLINE, Embase, Cochrane Central Register of Controlled Trials, CINAHL, PsycINFO, and SCOPUS were conducted from database inception to May 2019 to identify relevant citations.

STUDY SELECTION

Randomized clinical trials (RCTs) that compared MBI with usual care, waitlist controls, or no intervention for the management of anxiety in cancer patients were included. Two reviewers conducted a blinded screening. Of 101 initially identified studies, 28 met the inclusion criteria.

DATA EXTRACTION AND SYNTHESIS

Two reviewers independently extracted the data. The Cochrane Collaboration risk-of-bias tool was used to assess the quality of RCTs, and the Preferred Reporting Items for Systematic Reviews and Meta-analyses reporting guideline was followed. Summary effect measures were reported as standardized mean differences (SMDs) and calculated using a random-effects model.

MAIN OUTCOMES AND MEASURES

Our primary outcome was the measure of severity of short-term anxiety (up to 1-month postintervention); secondary outcomes were the severity of medium-term (1 to ≤6 months postintervention) and long-term (>6 to 12 months postintervention) anxiety, depression, and health-related quality of life of patients and caregivers.

RESULTS

This meta-analysis included 28 RCTs enrolling 3053 adults with cancer. None of the trials were conducted in children. Mindfulness was associated with significant reductions in the severity of short-term anxiety (23 trials; 2339 participants; SMD, -0.51; 95% CI, -0.70 to -0.33; I2 = 76%). The association of mindfulness with short-term anxiety did not vary by evaluated patient, intervention, or study characteristics. Mindfulness was also associated with the reduction of medium-term anxiety (9 trials; 965 participants; SMD, -0.43; 95% CI, -0.68 to -0.18; I2 = 66%). No reduction in long-term anxiety was observed (2 trials; 403 participants; SMD, -0.02; 95% CI, -0.38 to 0.34; I2 = 68%). MBIs were associated with a reduction in the severity of depression in the short term (19 trials; 1874 participants; SMD, -0.73; 95% CI; -1.00 to -0.46; I2 = 86%) and the medium term (8 trials; 891 participants; SMD, -0.85; 95% CI, -1.35 to -0.35; I2 = 91%) and improved health-related quality of life in patients in the short term (9 trials; 1108 participants; SMD, 0.51; 95% CI, 0.20 to 0.82; I2 = 82%) and the medium term (5 trials; 771 participants; SMD, 0.29; 95% CI, 0.06 to 0.52; I2 = 57%).

CONCLUSIONS AND RELEVANCE

In this study, MBIs were associated with reductions in anxiety and depression up to 6 months postintervention in adults with cancer. Future trials should explore the long-term association of mindfulness with anxiety and depression in adults with cancer and determine its efficacy in more diverse cancer populations using active controls.

The effectiveness of psychological interventions for fatigue in cancer survivors: systematic review of randomised controlled trials

BACKGROUND

Fatigue is a common symptom in cancer patients that can persist beyond the curative treatment phase. This systematic review evaluated the effectiveness of psychological interventions for cancer-related fatigue in post-treatment cancer survivors.

METHODS

We searched relevant online databases and sources of grey literature. Randomised controlled trials (RCTs) evaluating psychological interventions in adult cancer patients after the completion of treatment, with fatigue as an outcome measure, were included. Two review authors extracted data independently from the selected studies and assessed the methodological quality using the Cochrane Collaboration Risk of Bias Tool.

RESULTS

Thirty-three psychological interventions were identified. The sample size of the included studies varied between 28 and 409, with 4525 participants overall. Twenty-three of the included studies reported a significant effect of the interventions on reducing fatigue in cancer survivors. Most interventions focused on psychoeducation, mindfulness, cognitive or behaviour therapy-oriented strategies. However, studies differed widely in terms of measurement tools used to assess fatigue, mode, duration and frequency of the intervention delivery.

CONCLUSIONS

This review showed some tentative support for psychological interventions for fatigue after cancer treatment. However, as the RCTs were heterogeneous in nature and the number of high-quality studies was limited, definitive conclusions are not yet possible. With the growing need for stage-specific research in cancer, this review sought to inform current practice and to summarise the existing evidence base of randomised controlled trials in the area.

SYSTEMATIC REVIEW REGISTRATION

PROSPERO registration number: CRD42014015219.

Mindfulness-based interventions for psychological and physical health outcomes in cancer patients and survivors: A systematic review and meta-analysis of randomized controlled trials

OBJECTIVE

Mindfulness-based interventions (MBIs) are increasingly used within psycho-oncology. Since the publication of the most recent comprehensive meta-analysis on MBIs in cancer in 2012, the number of published trials has more than doubled. We therefore conducted a systematic review and meta-analysis of randomized controlled trials (RCTs), testing the efficacy of MBIs on measures of psychological distress (primary outcome) and other health outcomes in cancer patients and survivors.

METHODS

Two authors conducted independent literature searches in electronic databases from first available date to 10 October 2018, selected eligible studies, extracted data for meta-analysis, and evaluated risk of bias.

RESULTS

Twenty-nine independent RCTs (reported in 38 papers) with 3274 participants were included. Small and statistically significant pooled effects of MBIs on combined measures of psychological distress were found at post-intervention (Hedges's g = 0.32; 95%CI: 0.22-0.41; P < .001) and follow-up (g = 0.19; 95%CI: 0.07-0.30; P < .002). Statistically significant effects were also found at either post-intervention or follow-up for a range of self-reported secondary outcomes, including anxiety, depression, fear of cancer recurrence, fatigue, sleep disturbances, and pain (g: 0.20 to 0.51; p: <.001 to.047). Larger effects of MBIs on psychological distress were found in studies (a) adhering to the original MBI manuals, (b) with younger patients, (c) with passive control conditions, and (d) shorter time to follow-up. Improvements in mindfulness skills were associated with greater reductions in psychological distress at post-intervention.

CONCLUSIONS

MBIs appear efficacious in reducing psychological distress and other symptoms in cancer patients and survivors. However, many of the effects were of small magnitude, suggesting a need for intervention optimization research.