Abstract
Purpose
We aimed to estimate the effect of a 12-week web-based dietary intervention with text messages on quality of life (QoL) among colorectal cancer (CRC) survivors.
Methods
Between 2017 and 2018, 50 CRC survivors were randomized (1:1) to receive a 12-week web-based dietary intervention with daily text messages or wait-list control. Health-related QoL was assessed using the European Organization for the Research and Treatment of Cancer (EORTC) Quality of Life Questionnaire–Core 30 (QLQ-C30) and colorectal quality of life module (QLQ-CR29) at baseline, 12, and 24 weeks. Within- and between-group mean changes in health-related QoL with 95% confidence intervals (CI) were calculated for both arms.
Results
Compared to the controls, participants receiving the intervention had an improvement in emotional functioning (mean change: 14.3; 95% CI: 3.0, 25.6) at 12 weeks and social functioning (mean change: 13.8; 95% CI: 2.1, 25.5) at 24 weeks. A decrease of fatigue from baseline was also observed in the intervention arm (mean change: − 9.1; 95% CI: − 17.1, − 1.1) at 24 weeks. No other changes in QoL scores were associated with the intervention.
Conclusion
CRC survivors randomized to receive a web-based dietary intervention with text messages experienced higher emotional and social functioning. Further study with a larger population may be warranted.
Trial registration
clinicaltrials.gov, NCT02965521. Registered 16 November 2016, https://clinicaltrials.gov/ct2/keydates/NCT02965521
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Introduction
Colorectal cancer (CRC) is the third most commonly diagnosed cancer among men and women in the USA, with a 5-year survival rate of 65% [1]. As of 2018, it was estimated that over 1.3 million people are living with a CRC diagnosis in the USA [2].
Cancer survivors often deal with physical (e.g., fatigue, pain) and psychological (e.g., fear of recurrence, anxiety, depression) effects associated with cancer and its treatment [3,4,5,6]. In addition, CRC survivors may experience specific issues which are unique to this diagnosis, such as living with a stoma and bowel dysfunction [7]. Bowel dysfunction is common among colorectal cancer survivors [8]. For example, approximately 80–90% of rectal cancer patients who underwent sphincter-preserving surgery experience low anterior resection syndrome (LARS) with varied degree of severity [9]. The symptoms of LARS include fecal incontinence, urgency, and incomplete evacuation [9]. Nearly half of these patients continue to experience symptoms more than a decade after surgery [10, 11]. These post-cancer symptoms may have a significant long-lasting impact on the physical health, mental well-being, and quality of life (QoL) of CRC survivors [12,13,14].
Recent evidence suggests that a healthy diet after diagnosis of CRC may be associated with improvements in both survival and health-related QoL [15,16,17,18,19]. Our team previously reported longer survival after CRC diagnosis among those who reported health behaviors more consistent with the American Cancer Society (ACS) guidelines. The guidelines include maintaining a healthy body weight; regular physical activity; and a diet that includes vegetables, fruits, and whole grains [20]. Consumption of diets high in vegetables and fiber and low in red meat in particular may be associated with a lower level of fatigue and alleviate gastrointestinal symptoms related to CRC survivorship like diarrhea, bloating, and flatulence [21, 22]. Cross-sectional studies have reported that CRC survivors who met the recommendation of eating five or more portions of fruits and vegetables per day had significantly better health-related QoL compared to those who did not [23, 24]. In a randomized controlled trial among 223 CRC survivors, a 12-month dietary intervention that aimed to reduce the consumption of red/processed meat and refined grains was associated with significant improvements in QoL and depression compared to usual care control [25]. These studies show the promise of dietary interventions on improving health-related QoL among CRC survivors. However, research remains limited.
An increasing number of studies suggest that behavioral interventions using web and mobile technology are feasible and acceptable approaches to modify dietary behavior [26,27,28]. They can be largely automated and cost-effective, and therefore, these interventions may be more scalable compared to in-person studies or those with frequent telephone counseling [29, 30]. The effect of web-based dietary interventions on health-related QoL among CRC survivors is unknown.
The Survivor Choices for Eating and Drinking study (SUCCEED) was a pilot randomized controlled trial designed to determine the feasibility and acceptability of a 12-week web-based dietary intervention with text messages among CRC survivors [31]. The intervention was intended to help CRC survivors improve their diet quality, including increased intake of vegetables, whole grains, and fish; reduced intake of processed meat and sugar-sweetened beverages; and moderate alcohol consumption (if the patients chose to drink at all). QoL was a secondary endpoint in the SUCCEED trial. This paper aimed to estimate the effect of the intervention versus wait-list control on health-related QoL at 12 weeks (immediately post-intervention) and 24 weeks (12 weeks after the text message program ended).
Materials and methods
Details of the SUCCEED trial protocol, findings of feasibility and acceptability of the intervention, and estimated change in diet have been published previously [31]. CRC survivors randomized to the intervention engaged more with text messages than the study website. Additionally, the intervention increased whole grain intake from baseline to 12 and 24 weeks [31]. As noted above, this paper aimed to estimate the effect of the intervention on health-related QoL at 12 and 24 weeks post-enrollment. Informed consent was obtained from all participants. The study was conducted in accordance with recognized ethical guidelines and approved by the Institutional Review Broad of the University of California, San Francisco (UCSF). This trial was registered at clinicaltrials.gov (NCT02965521).
Study sample, recruitment, and randomization
Methods for the SUCCEED trial have been published previously [31]. Briefly, potential eligible individuals with a previous diagnosis of colon or rectal adenocarcinoma were identified through the gastrointestinal oncology clinic at UCSF between April 2017 and May 2018. The trial was also advertised on the web. Individuals were eligible to participate if they were not actively undergoing standard cytotoxic chemotherapy; were considered disease-free or had stable disease status at enrollment; were able to speak and read English; had access to mobile phone with the Internet and text messaging capabilities; and had regular access to the Internet, were able to navigate websites, and fill out forms on the web. Individuals who were already meeting four or more of the six target dietary behaviors (i.e., ≥ 5 servings of vegetables; ≥ 3 servings of whole grains per day; ≥ 2 servings of fish per week; limited intake of processed meat and alcohol; avoiding sweetened beverages) at screening were excluded. After screening and informed consent, 50 individuals were enrolled in the study. Eligible participants were randomized 1:1 to intervention or wait-list control using a block randomization method generated by a study biostatistician (LZ).
Intervention
Following randomization, participants assigned to the intervention arm received print materials; a personalized report that included information on whether the participants currently met, almost met, or did not meet each of the six dietary targets based on the screening survey; access to the study website; and daily text messages for 12 weeks. Details of the study website and text messages, including examples, have been previously described [31]. Twenty-one of the 84 text messages (25%) asked the participants for a reply. Text messages stopped after 12 weeks, but intervention participants were able to continue to access the study website after the 12-week intervention.
Wait-list control
Participants randomized to the wait-list control arm received print materials on diet after CRC at enrollment. They had the option to receive the intervention from 12 to 24 weeks after completing the 12-week assessment. Twenty-one of the 25 control participants opted to receive the intervention.
Outcome measures
All participants were assessed at baseline, 12, and 24 weeks. Health-related QoL was accessed using the European Organization for the Research and Treatment of Cancer (EORTC) Quality of Life Questionnaire–Core 30 (QLQ-C30) [32] and colorectal quality of life module (QLQ-CR29) [33] administered online using the UCSF Research Electronic Data Capture (REDCap) system [34, 35].
The 30-item QLQ-C30 contains five functioning scales (physical, role, cognitive, emotional, and social functioning), three symptom scales (fatigue, pain, nausea, and vomiting), six symptom items (dyspnea, insomnia, appetite loss, constipation, diarrhea, financial difficulties), and a global health status/QoL scale. Scores for each scale/item range from 0 to 100. A higher score for the global health status/QoL represents a better QoL, and higher scores on the functional scales reflect better functioning. Higher scores on the symptom scales reflect a higher level of symptomatology/problems. The QLQ-C30 scoring manual [36] was used to calculate the scores. This paper focuses on change in global health status, the five functioning scales, as well as two symptom scales (fatigue; nausea; and vomiting) and three symptom items (appetite loss; constipation; diarrhea) that we hypothesized to be potentially related to diet.
The 29-item QLQ-CR29 is a disease specific instrument used to supplement the EORTC QLQ-C30 to assess health-related QoL in patients with CRC. This 29-item questionnaire contains four subscales (urinary frequency (UF), blood and mucus in stool (BMS), stool frequency (SF), body image (BI)) and 19 single items (urinary incontinence, dysuria, abdominal pain, buttock pain, bloating, dry mouth, hair loss, taste, anxiety, weight, flatulence, fecal incontinence, sore skin, embarrassment, stoma care problems, sexual interest (assessed using different questions for men and women), impotence, and dyspareunia). Patients were asked to indicate their symptoms for sexual interest items during the past 4 weeks and symptoms for all other items/scales during the past week. Responses were linearly transformed into a score ranging from 0 to 100 [37]. Higher scores reflect better functioning on the functional scales/single items. Higher scores on the symptom scales/single items reflect a higher level of symptomatology/problems. In this study, we focused on the four subscales (UF, BMS, SF, and BI) as well as five single items (bloating, taste, flatulence, fecal incontinence, and weight) that we hypothesized to be potentially related to diet.
Statistical analysis
Demographic and baseline characteristics were summarized for all participants. Frequency distributions were used to summarize categorical measurements, while mean (standard deviation (SD)) and median (interquartile range (IQR)) were used to describe symmetric and skewed continuous measurements, respectively. In accordance with the CONSORT guidelines for pilot and feasibility trials [38], efficacy statistical tests were not conducted. Point estimates with 95% confidence intervals (CI) of mean differences from baseline to 12 weeks and 24 weeks for each arm and the difference in mean health-related QoL score change between the two arms from baseline to 12 and 24 weeks were calculated and reported. All statistical analyses were conducted using R (Version 4.0.2 (R Core Team (2020))).
Results
The CONSORT flow was previously published [31]. In brief, 94 individuals were assessed for eligibility, and 50 individuals were randomized 1:1 to the intervention (n = 25) or wait-list control (n = 25). The most common reason of ineligibility was meeting four or more of the six target dietary behaviors (n = 14) at enrollment. Follow-up based on completion of the health-related QoL questionnaires was 88% at both 12 and 24 weeks in the intervention arm and 92% and 80% at 12 and 24 weeks in the control arm, respectively.
Table 1 shows the baseline characteristics of all participants (please see the trial’s main paper for baseline characteristics by arm).31 The median age was 55.4 years (IQR: 50.7, 62.3), and 34% of participants identified as men. Most of the participants (70%) identified as non-Hispanic white race; 12% identified as Hispanic ethnicity. Most participants (70%) had stage III cancer at diagnosis. With a range of 4 to 407 months, the median time since diagnosis among the participants was 24 months (IQR: 14, 41). Regarding target dietary behaviors, most of the participants (82%) met the target dietary behavior of limited alcohol intake, but only 8% of the participants met the target dietary behavior of more than 5 servings of vegetables per day at enrollment.
Health-related QoL
Results from the EORTC QLQ-C30 are shown in Table 2. The global health status/QoL score of our participants was relatively high with a median of 75 for both arms at enrollment. At 12 weeks, individuals in the intervention arm showed improvements in emotional functioning (mean change: 9.1; 95% CI: 2.2, 16.0) and cognitive functioning (mean change: 4.6; 95% CI 1.2, 7.9) from enrollment. The change in emotional functioning was different from change observed in the controls (between-group mean difference in emotional functioning: 14.3; 95% CI: 3.0, 25.6). However, these differences did not appear to be maintained at 24 weeks.
At 24 weeks, the intervention arm had a greater improvement in social functioning compared to the controls (between-group mean difference: 13.8; 95% CI: 2.1, 25.5); this difference was not observed at 12 weeks. Additionally, the intervention arm appeared to improve in fatigue at 24 weeks (mean different: − 9.1, 95%CI: − 17.1, − 1.1), but this change was not different from the mean change observed in the controls (between-group difference: − 2.6; 95% CI: − 10.8, 5.6). Participants had a median score of 0 for the nausea and vomiting, appetite loss, constipation, and diarrhea symptom subscales at enrollment.
The intervention was not associated with changes in disease-specific health-related QoL measured by EORTC QLQ-CR29 (Table 3). No change from enrollment was observed in any subscales or the 5 diet-related single items in the intervention arm at 12 or 24 weeks. However, participants had low symptom burden with all median scores clustered at the lower end of the scale at enrollment. Increases in scores, which indicate a higher level of problem, in blood or mucus in stool (mean change: 7.3; 95% CI: 2.5, 12.0), (concern about) body image (mean change: 12.1; 95% CI: 2.0, 22.2), and (concern about) weight (mean change: 14.5; 95% CI: 5.0, 24.0) were observed in the controls from 0 to 12 weeks, but there was no evidence of between-group differences in these symptoms.
Discussion
The purpose of this secondary analysis was to estimate the effect of a 12-week web-based dietary intervention with daily text messages on health-related QoL among CRC survivors. Participants receiving the intervention showed improvements in the emotional functioning subscale of EORTC QLQ-C30 at 12 weeks compared to participants in the control arm, though this did not result in an improvement in overall global health score.
Health-related QoL is an important outcome for successful cancer survivorship [39]. For CRC in particular, survivors often deal with health-related QoL challenges from physical, social, emotional, and cognitive factors [40, 41]. While data are limited, adherence to lifestyle recommendations, including a healthy diet, has been associated with higher QoL after CRC treatment [15, 25]. For example, a study from Kenkhuis et al. reported that higher dietary fiber, fruit, and vegetable intake was associated with better physical and role functioning and less fatigue in the first 2 years after CRC treatments [21]. However, adherence with these recommendations is suboptimal, especially dietary behaviors, and improving diet after diagnosis is one of the goals of CRC survivorship care [42].
A number of small studies have examined the effect of mobile health lifestyle interventions with websites, mobile apps, text messages, and activity trackers among cancer survivors [43,44,45,46,47,48,49,50,51,52,53]. Most of them have focused on physical activity or physical activity plus dietary interventions among breast cancer [47,48,49,50] or prostate cancer [51,52,53] survivors. No published studies have assessed the effect of technology-based diet-only interventions on HRQoL among CRC survivors. Thus, the present study adds to our understanding of the effects of web-based dietary interventions on health-related QoL in this population.
In our study, the magnitude of changes in emotional functioning, cognitive functioning, social functioning, and fatigue were clinically meaningful. According to the interpretation guide of EORTC QLQ-C30 [54], the changes we observed in emotional functioning at 12 weeks and social functioning at 24 weeks are categorized as medium improvements. The changes observed in cognitive functioning and fatigue were small improvements. Deficits in emotional and social functioning are factors hampering the QOL among CRC patients [13]. Thus, larger studies to confirm our observations may be warranted. In addition, there are no previous data available to estimate the SD of change scores for the EORTC QLQ-C30 among this population of colorectal cancer survivors. Thus, the sample size needed in future studies examining these outcomes could be calculated using the effect sizes from the interpretation guide [54] and the SD of the change scores from our study.
No intervention effects were observed for the other subscales, including physical and role functioning, nausea and vomiting, appetite loss, constipation, and diarrhea. It is worth noting that scores of these subscales in our study sample were relatively higher at baseline compared to general CRC survivors at similar age or stage [55]. This higher ceiling may limit the room for improvements. To better examine the effect of the intervention on physical aspects of QoL, a study population with more symptoms in these domains at enrollment is needed.
Strengths of this study include the randomized design and high retention rate (90% at 12 weeks). However, there are several limitations that should be noted. More than half (66%) of our participants were female, and most of the participants (96%) possessed college degrees and relatively high baseline health-related QoL, which may limit the ability to detect improvement as well as the generalizability of the study. Further, while 30% of our study sample identified as a race other than non-Hispanic white, we had low enrollment of Black CRC survivors—the group with the highest mortality rate from CRC [56]. It is also possible that the changes we observed in emotional and social functioning would not have been observed if we had used an attention control versus a wait-list control [57].
In conclusion, our results suggest a potential beneficial effect of a web-based dietary intervention on aspects of health-related QoL among CRC survivors and provide insights for future study planning. Future studies should focus on defining the optimal time to intervene and type of intervention, including duration and frequency of messages, enrolling a more diverse population with lower health-related QoL at enrollment, and determining the long-term sustainability of the intervention’s effects.
Data availability
De-identified data are available upon request.
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This research was supported by the NIH. The funders had no role in the design of the study; collection, analysis, or interpretation of data; or writing the manuscript.
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All authors contributed to the study conception and design. Material preparation, data collection, and analysis were performed by Lufan Wang, Li Zhang, Isabel Allen, and Erin Van Blarigan. The first draft of the manuscript was written by Lufan Wang, and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Approval was obtained from the ethics committee of the UCSF Institutional Review Board. The procedures used in this study adhere to the tenets of the Declaration of Helsinki.
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Informed consent was obtained from all individual participants included in the study.
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Competing interests
CSL received funding from the National Cancer Institute of the National Institutes of Health (F31CA247093) and the University of California Prostate Cancer Program Pilot Award, was a consultant at Bohn Epidemiology, LLC during the 3-year period surrounding this work, and is currently employed as an Epidemiologist at IQVIA, unrelated to the current study. SAK is a consultant and board member for Fellow Health Inc., unrelated to the current study. JAM has served as an advisor/consultant to Merck Pharmaceutical and COTA Healthcare. No other potential conflicts of interest were reported.
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Wang, L., Langlais, C., Kenfield, S.A. et al. Quality of life among colorectal cancer survivors participating in a pilot randomized controlled trial of a web-based dietary intervention with text messages. Support Care Cancer 31, 155 (2023). https://doi.org/10.1007/s00520-023-07620-x
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DOI: https://doi.org/10.1007/s00520-023-07620-x