Abstract
Purpose
The aims of this systematic review were to (1) examine the prevalence, severity, manifestations, and clinical associations/risk factors of sleep disturbance in primary brain tumour (PBT) survivors and their caregivers; and (2) determine whether there are any sleep-focused interventons reported in the literature pertaining to people affected by PBT.
Methods
This systematic review was registered with the international register for systematic reviews (PROSPERO: CRD42022299332). PubMed, EMBASE, Scopus, PsychINFO, and CINAHL were electronically searched for relevant articles reporting sleep disturbance and/or interventions for managing sleep disturbance published between September 2015 and May 2022. The search strategy included terms focusing on sleep disturbance, primary brain tumours, caregivers of PBT survivors, and interventions. Two reviewers conducted the quality appraisal (JBI Critical Appraisal Tools) independently, with results compared upon completion.
Results
34 manuscripts were eligible for inclusion. Sleep disturbance was highly prevalent in PBT survivors with associations between sleep disturbance and some treatments (e.g., surgical resection, radiotherapy, corticosteroid use), as well as other prevalent symptoms (e.g., fatigue, drowsiness, stress, pain). While the current review was unable to find any sleep-targeted interventions, preliminary evidence suggests physical activity may elicit beneficial change on subjectively reported sleep disturbance in PBT survivors. Only one manuscript that discussed caregivers sleep disturbance was identified.
Conclusions
Sleep disturbance is a prevalent symptom experienced by PBT survivors, yet there is a distinct lack of sleep-focused interventions in this population. This includes a need for future research to include caregivers, with only one study identified. Future research exploring interventions directly focused on the management of sleep disturbance in the context of PBT is warranted.
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Introduction
Persistent sleep dysfunction negatively impacts quality of life (QoL) in people affected by cancer, with evidence suggesting an association between sleep quality and other health-related and cancer-specific outcomes, including survival [1, 2]. While previous reviews have reported sleep outcomes in the general cancer populations, people with primary brain tumours (PBT) are rarely included in data synthesis despite the symptom being increasingly recognized in clinical care; this is likely due to the rarity of PBT, representing ~ 1.5% of all cancers diagnosed [1, 3, 4]. Beyond the burden placed on PBT survivors, the physical and emotional burden of becoming a family caregiver (herein referred to as “caregivers”) for a person with PBT may also lead to sleep disturbance. The survivor-caregiver dyad is a critical relationship, with caregivers heavily involved in care coordination and support. However, this role directly exposes caregivers to numerous factors that may directly impact sleep including interruptions to routines and schedules (e.g., attending to overnight care needs, prioritising medical assistance) and increased stress, worry and hypervigilance manifesting into psychological issues (e.g., depression, anxiety) [5, 6].
Two recent review articles [6, 7] highlight sleep disturbance as a highly prevalent and severe symptom impacting health-related quality of life (HRQoL) in PBT survivors, citing sleep disturbance as one of the most frequent and impactful symptoms reported throughout the disease trajectory. Additionally, the poor prognosis many people with PBT impacts the ability to perform detailed longitudinal studies [8, 9]. Unfortunately, there is a notable lack of understanding concerning the patterns, prevalence, severity, and risk factors for sleep disturbance in PBT survivors and their caregivers. Both reviews [6, 7] highlight major drawbacks in prior literature: (1) most evidence stems from HRQoL measures that only include a single item or question pertaining to an individual’s sleep, (2) study samples are typically small groups of people with low-grade or benign tumours following surgical resection, limiting the ability to infer results for higher grade disease, and (3) there is a distinct lack of inclusion of caregivers in prior literature. The review by Jeon et al. [6] also included studies of people with secondary (metastatic) brain cancer, further limiting the inferences that can be made from the general results of this review for PBT survivors specifically.
Our systematic review assimilates the latest evidence to understand the prevalence and risk factors of sleep disturbance in people affected by PBT. Jeon et al. [6] reported findings between January 1990 and September 2015. Since then, attention towards neuro-oncology HRQoL has resulted in augmented clinical and supportive care measures, justifying an updated review. Our primary aim was to examine the prevalence, severity, and manifestations of sleep disturbance in PBT survivors and their caregivers and explore potential risk factors and clinical determinants of sleep disturbance in these two groups. A secondary aim was to determine whether there are any sleep-focused interventions reported in the literature pertaining to people affected by PBT.
Methods
Search strategy and eligibility criteria
We conducted a systematic review in accordance with the Preferred Reporting Items for Systematic Reviews and Meta-Analysis (PRISMA) 2020 guidelines [10], and registered with the international register for systematic reviews (PROSPERO: CRD42022299332). Searches were conducted using the PubMed, EMBASE, Scopus, PsychINFO, and CINAHL electronic databases. The search strategy included keywords or medical sub-headings related to sleep and primary brain tumours, appropriately adapted for each database. Database limiters were applied, where applicable, to identify publications in English with adult subjects between September 2015 and May 2022 to avoid cross-over with the work by Jeon et al. [6] and limited only to PBT survivors and their caregivers. Additional manual searches for relevant manuscripts not identified in the initial search strategy and/or previously included in earlier reviews were performed on reference lists of eligible manuscripts; these additional manual searches were not limited by date range though were subject to the other database limiters. To improve the translation of the search strategy across multiple databases, the Bond Universities Systematic Review (SR) Accelerator [11] Polyglot Search Translator [12] was used. Studies reporting information regarding sleep disturbance or interventions to assist with improving or managing sleep disturbance in adults (≥ 18 years) diagnosed with PBT during or post-treatment, and their caregivers were included. Tools we considered for reporting sleep disturbance included:
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1.
Validated self-report sleep assessments;
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Sleep recording device that provides objective sleep data;
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Sleep diary or log with ≥ 7 sleep–wake cycles;
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A validated HRQoL study reporting ≥ 1 sleep item;
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A validated psychological assessment reporting ≥ 1 sleep item;
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A validated symptom assessment reporting ≥ 1 sleep item.
The results from all database searches were imported to a combined library in EndNote (X9). The library was then imported to the SR Accelerator [11], where duplicates were removed using the Deduplicator tool. One author (JM) screened all titles and abstracts based on the above criteria using the SR-Accelerators Screenatron tool [11]. Full-text articles were then assessed by two independent reviewers (JM, AD); any discrepancies were discussed and resolved by a third author (JH).
Quality appraisal
Articles eligible for inclusion were assessed using the Joanna Briggs Institute (JBI) critical appraisal tool [13] relevant for each study design. The JBI critical appraisal tool is a standardised methodology used to assess the quality of studies for risk of bias and overall quality of individual studies based on a number of criteria including study design, sample size, and method of data collection. Quality appraisal was conducted independently by JM and AD with arbitration by JH when required. Studies were not excluded based on their quality appraisal.
Data extraction and statistical analysis
Relevant information from eligible studies was recorded in a data extraction spreadsheet, including publication information (title, authors, publication year), study design, sample size, demographic information (e.g., age, sex, cancer type, treatment status), and study aims and outcomes (e.g., sleep measures reported, sleep outcomes). Due to the small and heterogenous sample sizes recruited for included studies and varying methodologies, a meta-analysis was not performed. Studies were categorised as intervention studies, descriptive sleep studies, or HRQoL studies according to the primary focus or objective of each study. Sleep related outcomes were extracted as reported in the original manuscripts; for intervention studies, a p value of ≤ 0.05 was considered statistically significant unless stated otherwise.
Results
Inclusion of studies
A total of 2184 manuscripts were evaluated for title and abstract screening, which was reduced to 100 articles for full text screening following removal of duplicates. Following full-text review, 27 articles of varying quality were included in the systematic review. Following further manual searches, an additional 7 articles were included. Therefore a total of 34 manuscripts were included in this review (Fig. 1).
Characteristics of included studies
All 34 included articles were published between 1998 and 2022, consisting of 16 cross-sectional studies [14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29], 7 randomised control trials (RCT) [30,31,32,33,34,35,36], 4 quasi-experimental studies [37,38,39,40], and 7 cohort studies [41,42,43,44,45,46,47]. The results of the included articles were informed by 4,694 PBT survivors and 120 caregivers, with sample sizes ranging from 12 to 621 with an age range of 18–86 years. Most articles reported gender distribution, noting PBT survivors were predominantly male (52%) and caregivers female (71%). Ten studies exclusively included high-grade glioma (HGG) samples [17, 24, 25, 30, 36, 37, 40, 43, 46, 47], while seven exclusively included low-grade glioma (LGG) samples [21, 23, 27, 31, 35, 39, 42]. Seventeen studies involved mixed samples of LGG and HGG [14,15,16, 19, 20, 22, 26, 28, 29, 32,33,34, 38, 39, 41, 44, 45].
Sleep was primarily assessed using validated subjective questionnaires, including the Pittsburgh Sleep Quality Index (PSQI) [19, 21, 29, 33, 37], the Insomnia Severity Index (ISI) [29, 45], the Epworth Sleepiness Scale (ESS) [21], the Athens Insomnia Scale (AIS) [21], the General Sleep Disturbance Scale (GSDS) [17], and the Brief Sleep Disturbance Scale (BSDS) [32]. Furthermore, validated symptom or outcome measures reporting ≥ 1 sleep item included the NCCN Distress thermometer [20], the PROMIS Clinical Outcomes Assessment (V1) [22], the Fact-BR [36], and the Common Terminology Criteria for Adverse Events (CTCAE) [26]. In addition to these validated sleep or symptom assessment tools, validated HRQoL assessments that included at least 1 sleep-related item were also reported, including the EORTC QLQ-C30 [16, 23,24,25, 27, 28, 30, 31, 34, 35, 39,40,41,42,43,44,45,46,47] & BN20 [16, 18, 24, 25, 28, 30, 31, 39, 45, 47] modules, describing insomnia and drowsiness, respectively, as well as the MDASI-BT [14, 15, 39]. Finally, a small number of studies also included objective assessments including actigraphy [21] and polysomnography (PSG) [38].
Articles were categorised into three groups based on the following criteria: (1) reported validated sleep tool or a validated symptom or outcome assessment that reported ≥ 1 sleep measure (Table 1); (2) reported a HRQoL assessment (Table 2); or (3) included intervention studies that reported a validated sleep measure, HRQoL measure, or a validated symptom or outcome assessment that reported ≥ 1 sleep measure (Table 3). In total, 9 (25%) included articles had a primary focus on the prevalence, severity or presentation of sleep disturbance in PBT survivors [19,20,21,22, 26, 29, 30, 38], with the remaining articles having a primary focus on HRQoL [14,15,16,17,18, 23,24,25, 28, 30,31,32,33,34,35,36,37, 39,40,41,42,43,44,45,46,47,48].
Types, prevalence, and severity of sleep disturbance in PBT survivors
Sleep disturbance was described using a variety of sleep-related terms, mainly related to dissatisfaction with sleep quality, insomnia (disruption in sleep quantity, pattern, or architecture), somnolence, and obstructive sleep apnea; of these, insomnia and dissatisfaction with sleep quality were the highest reported sleep problems as most studies assessed these types of sleep complaints. Sleep-related questions in HRQoL studies asked specifically about disturbed sleep or insomnia. Across studies reporting validated sleep measures and validated symptom or outcome assessments (Table 1), few reported the prevalence of sleep disturbance assessed by clinical thresholds or cut-offs for respective questionnaires. Of five studies that used the PSQI, three reported the percentage of people scoring > 5 (i.e., significant sleep disturbance) with results estimating the prevalence of sleep disturbance between 37.0 and 81.8% [19, 21, 29]. One study using the GSDS [17] reported 100% of subjects experienced sleep disturbance. Two studies using the NCCN Distress Thermometer [20] and the CTCAE [26] reported the prevalence of sleep disturbance in their samples of people with glioma at 33.3% and 46.8%, respectively. Regarding HRQoL studies (Table 2), one study using the MDASI-BT reported the prevalence of sleep disturbance as 22% and drowsiness as 28% [14]. Additionally, mean PSQI scores reported in five studies ranged from 5.19 ± 3.39 to 11.53 ± 5.38, indicative of significant sleep disturbance [19, 21, 29, 33, 37]. Of two studies reporting the ISI, one reported that 17.4% of PBT survivors experienced moderate insomnia, while a further 4.1% experienced severe insomnia [29]. The single study utilising PSG reported that the average total sleep time of PBT survivors ranged between 309–319 min (5.15–5.50 h) per night [38].
Risk factors/clinical associations
Treatment modalities such as surgical resection [19, 27, 39, 42], radiotherapy [30, 35, 38, 45], and corticosteroid use [29] appear to be associated with sleep disturbance in PBT survivors. Undergoing surgical resection was associated poorer sleep quality and sleep disturbance in short-term, post-operative follow-ups (e.g., 1–12 months) [39, 42] compared to longer term follow-up periods (e.g., > 12 months) [19, 27]. However, a longitudinal study following surgical resection for LGG reported statistically significant sleep impairments at post-operative intervals from 12 to 72 months and 120 + months (p = < 0.05) [27]. While several studies suggest that radiotherapy is associated with sleep disturbance, one study conducted during radiotherapy treatment found no difference in objectively and subjectively measured sleep when comparing pre-treatment to post-treatment up to 2 months[38]. However, another found that patients who receive higher doses of radiotherapy experience higher levels of insomnia and fatigue post-radiotherapy (p = 0.05) [35]. Finally, consistent with previous literature, the results from the HRQoL studies highlighted the occurrence of sleep disturbance in a symptom cluster with other prevalent symptoms, such as fatigue, drowsiness, stress, and pain [17, 18, 27, 45].
Two studies explored whether tumour characteristics such as location or laterality impacted sleep regulation or QoL; however, neither location and/or laterality appeared to be associated with sleep disturbance in the current review [18, 21]. Only one study (n = 5) reported caregiver sleep [37], thus limiting the ability to explore risk factors or clinical associations for sleep disturbance in caregivers specifically.
Interventions
No evidence of the development or utilisation of any interventions to manage sleep symptoms in people affected by PBT was found. Five intervention studies that reported sleep data were deemed suitable based on the eligibility criteria (Table 3). These interventions included pharmacological [32], alternative therapy (i.e., cannabis) [36], and physical activity [33, 34, 37].
An open-label pilot study aimed to assess the general and differential efficacy of methylphenidate and modafinil in PBT survivors [32]. Following randomisation to one of three conditions and four-weeks of intervention, no significant improvements were noted in sleep disturbance.
A RCT investigated the use of cannabis in two different ratios of THC to CBD [36]. Overall, there was an improvement in sleep reported for both intervention groups compared to baseline, though results favoured the 1:1 ratio compared to the 4:1 ratio (Fact-BR Sleep mean group difference = 2.59; 95%CI = 2.4–2.77; p = 0.009).
Gehring et al. [33] performed a RCT that explored the impact of an individualised, home-based aerobic exercise program on cognitive functioning in glioma patients. The results from this trial found a small between group difference in PSQI results (+ 0.34; 95%CI − 0.23–0.91) favouring the intervention group [33]. Similarly, Hansen et al. [34] performed a RCT assessing the effectiveness of physical and occupational therapy interventions compared to usual care on QoL in glioma patients during treatment that were functionally independent. The intervention group displayed better insomnia (Intervention Mean = 17.3; Control Mean = 27.7, β-coefficient = 10.4, p = 0.21) and drowsiness (Intervention Mean = 29.2; Control Mean = 41.3, β-coefficient = − 12.1, p = 0.04) scores as measured by the EORTC QLQ-C30 and BN20 questionnaires when compared to the control group [34]. Finally, Milbury et al. [37] performed a single arm pilot study that involved a 12-session dyadic yoga program during radiation therapy for HGG survivors. Their results indicated a clinically significant reduction in patient sleep disturbance, as recorded by the PSQI, at the end of the 12 sessions (Baseline = 10.75 ± 2.06; post-intervention = 8.00 ± 1.41; p = 0.10, d = 1.17), though the opposite effect was noted in caregivers (Baseline PSQI = 10.40 ± 3.03; post-intervention = 11.20 ± 3.03; p = 0.34, d = 0.49) [37].
Discussion
Sleep is an essential biological process with a vital role in maintaining homeostatic mechanisms, physiological function and psychological wellbeing [49,50,51]. It is critical to maximising health and QoL in people affected by cancer (i.e., cancer survivors and caregivers) [50, 51]. However, disturbances and alterations in sleep are commonly reported in people affected by cancer, with sleep disturbance observed in 50–60% of cancer survivors [1, 52] and 40–70% of caregivers [53]. Recently, two reviews highlighted sleep disturbance as a highly prevalent and severe symptom experienced by people diagnosed with brain tumours, significantly impacting HRQoL [6, 7]. Our systematic review extends on these findings by assimilating the current evidence regarding sleep disturbance in PBT survivors, and the first systematic review to explicitly explore sleep disturbance in adults affected by PBT (i.e., PBT survivors and their caregivers). Most studies (29 of 34) included in this systematic review had a primary focus on HRQoL, particularly frequently reported symptoms, levels of physical/psychological functioning, and overall QoL.
Our review demonstrates that sleep disturbance is highly prevalent and reported as one of the most common symptoms experienced by PBT survivors. While it is difficult to determine the prevalence of sleep disturbance from results of the other HRQoL studies, sleep disturbance and drowsiness were repeatedly reported among the most prevalent and severe symptoms. The severity of sleep disturbance and drowsiness scored similarly despite the heterogeneity of PBT survivors participating in the included studies, as represented by the mean scores for the EORTC QLQ-C30 & BN20 and the MDASI-BT (Table 2). Consistent with previous literature, treatment modalities such as surgical resection [19, 27, 39, 42], radiation therapy [30, 35, 38, 45], and corticosteroid use [29] are associated with sleep disturbance in PBT survivors. Furthermore, sleep disturbance often appeared in a “symptom cluster” (i.e., consisting of two or more symptoms related to each other) with other prevalent symptoms such as fatigue, drowsiness, distress, and pain [17, 18, 29, 45]. Sleep disturbance is multi-faceted; psychologically and biologically driven sleep disturbance is bi-directional, each contributing to the perpetuation and exacerbation of sleep disturbance. Spielman’s 3P model of insomnia, also referred to as the behavioural model of insomnia, offers an illustrative paradigm that conceptualizes the multi-faceted phenomenon of sleep disturbance [54]. The model suggests that predisposing (e.g., bio-psychological factors such as the presence of hyper-arousability, worry, prior personal/family history of sleep disturbance) and precipitating (e.g., acute occurrences such as hospitalisation, surgery, chemotherapy, radiation, corticosteroids) factors result in the development of insomnia, while perpetuating factors (e.g., actions that arise as a result of insomnia/sleep disturbance, such as maladaptive sleep behaviours, faulty beliefs/perceptions) result in insomnia becoming chronic [54]. As such, sleep disturbance may arise as a result of other common symptoms (e.g., pain, fatigue) or result in increased susceptibility to these other symptoms. However, there are a range of pathophysiological processes underpinning sleep disturbance in PBT survivors (e.g., direct tumour and treatment influences, unique susceptibility to heterogenous symptoms, cognitive impairment, neuropsychological deficits), and further research is required to truly understand the nature of sleep disturbance in this population.
The caregiver-survivor dyad is a critical resource in ongoing care of PBT survivors. Providing care for people diagnosed with PBTs may present an increased burden relative to other cancers due to the complexity of presentation throughout disease trajectory. The caregiver’s role of support and management of the person with PBT is unique as they must manage cognitive deterioration, personality change, disinhibition, and communication difficulties, while sustaining a meaningful relationship with the person who has usually been a major part of their lives for a significant period of time [6, 55]. Despite the importance of this role, there is a distinct lack of inclusion of caregivers in PBT research, with our review identifying only one study involving caregivers [37].
While there is a plethora of sleep-focused literature reporting a myriad of interventions to combat sleep disturbance in other populations, our review could not identify evidence for any such interventions in people with PBT and their caregivers. CBT is defined as interventions/approaches that help individuals identify helpful and/or maladaptive thoughts, feelings, and perceptions and implement beneficial coping behaviours [56]. Despite being recommended as a front-line treatment for sleep disturbance in cancer populations in general [56], CBT was not studied as an intervention in any of the included manuscripts. Notwithstanding the absence of these sleep-focused interventions, our review found preliminary evidence suggesting that physical activity may elicit beneficial outcomes on sleep disturbance, drowsiness, and fatigue specific to PBT survivors [22, 33, 34, 37]. The physical implications of a PBT diagnosis compromise QoL and independence, with marked reductions in strength and fitness when compared to age- and sex-matched normative data [57, 58]. Following a PBT diagnosis, reduced physical activity levels are observed, potentially exacerbating tumour- and treatment-related effects [57, 59]. However, higher levels of physical activity post-diagnosis may be associated with improved health outcomes, particularly outcomes that influence QoL, potentially leading to improved management of sleep disturbance and fatigue [57, 59]. In addition to physical activity, use of medicinal cannabis may also be an applicable intervention to assist with managing QoL concerns, particularly sleep disturbance in PBT survivors [36]. While the safety and tolerability of cannabis has been trialled in the general population, further research is required in the context of PBT before recommendations can be made.
The current systematic review is not without limitations. Studies recruited heterogenous samples within and between studies reporting a range of clinical and treatment features. This made it hard to identify prevalent types or presentations of sleep disturbance, as well as clear associations with other factors. Furthermore, most evidence stems from HRQoL research as secondary, single-item symptom scales. Small sample sizes in these studies resulted in a lack of statistical power. Studies in this population are subject to high attrition rates, particularly for people with HGG. As such, this results in a selection bias towards “more well” individuals typically remaining in study populations, meaning that overall performance of the population with regard to HRQoL domains may be over-estimated.
Implications for practice and research
Understanding sleep disturbance in PBT survivors and their caregivers is important for providing quality care, yet current knowledge is limited. While there is a growing body of evidence linking sleep with overall health, sleep disturbance does not typically occur in isolation in PBT survivors and their caregivers, making prioritisation and management difficult. More research utilising standardized, multifaceted sleep assessment tools are needed to establish a better understanding of the patterns and prevalence of sleep disturbance. Most available evidence is limited to describing the presence of sleep disturbance subjectively as part of overall HRQoL evaluation; the use of objective assessments, such as PSG or actigraphy is imperative to establishing and understanding the patterns and manifestations of sleep disturbance in the context of PBT. However, the value of validated and brief sleep-focused questionnaires (e.g., PSQI, ISI) should not be overlooked as practical additions to improve longitudinal assessment and monitoring of symptoms over the disease trajectory. Finally, a plethora of sleep-focused research employ interventions such as CBT, mindfulness, and pharmacological interventions, however there is no evidence available in the context of PBT. Our systematic review does, however, provide preliminary evidence to suggest that physical activity may be beneficial to PBT survivors not only in the context of HRQoL, but for sleep specifically. Further research exploring other interventions with a focus on sleep disturbance in people affected by PBT is warranted including CBT.
Data availability
All data generated or analysed during this study are included in this published article and its supplementary information files.
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Acknowledgements
The authors thank Peter Sondergeld (Liaison Librarian, Queensland University of Technology) for his guidance with development of the search strategy. The authors would also like to thank Dr Ali Dulfikar, Clinical Associate Lecturer at The University of Queensland, for his assistance during with the critical appraisal of included manuscripts.
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Martin, J.A., Hart, N.H., Bradford, N. et al. Prevalence and management of sleep disturbance in adults with primary brain tumours and their caregivers: a systematic review. J Neurooncol 162, 25–44 (2023). https://doi.org/10.1007/s11060-023-04270-1
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DOI: https://doi.org/10.1007/s11060-023-04270-1