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Original Article Evaluating the Effects of Mindfulness-Based Self-Help via an OTT Platform on Breast Cancer Patients Undergoing Radiotherapy: A Prospective Nonrandomized Controlled Trial
Hyejo Ryu1,a)orcid, Si Nae You1, Sohee Oh2, Bora Kim3, Jeong-Hyun Kim4,orcid, In Ah Kim1,5,orcid

DOI: https://doi.org/10.4143/crt.2024.955
Published online: November 25, 2024

1Department of Radiation Oncology, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea

2Medical Research Collaborating Center, Seoul Metropolitan Government Seoul National University Boramae Medical Center, Seoul, Korea

3Sunflower Center of Southern Gyeonggi for Women and Children Victims of Violence, Suwon, Korea

4Department of Psychiatry, Seoul National University Bundang Hospital, Seongnam, Korea

5Department of Radiation Oncology and Cancer Research Institute, Seoul National University College of Medicine, Seoul, Korea

Correspondence: In Ah Kim, Department of Radiation Oncology, Seoul National University Bundang Hospital, Seoul National University College of Medicine, 82 Gumi-ro 173 beon-gil, Bundang-gu, Seongnam 13620, Korea
Tel: 82-31-787-7651 E-mail: inah228@snu.ac.kr
Co-correspondence: Jeong-Hyun Kim, Department of Psychiatry, Seoul National University Bundang Hospital, 82 Gumi-ro 173 beon-gil, Bundang-gu, Seongnam 13620, Korea
Tel: 82-31-787-2025 E-mail: retrial3@hanmail.net
a)Present address: Department of Radiation Oncology, Chung-Ang University Gwangmyeong Hospital, Gwangmyeong, Korea
• Received: October 1, 2024   • Accepted: November 20, 2024

Copyright © 2025 by the Korean Cancer Association

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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  • Purpose
    Previous research showed the benefits of mindfulness meditation on the mental health and quality of life of breast cancer patients. Traditionally, these programs relied on in-person interactions, but the coronavirus disease 2019 pandemic necessitated alternative delivery methods. This study evaluated the effectiveness and feasibility of a mindfulness-based self-help (MBSH) program via Netflix for breast cancer patients undergoing radiotherapy.
  • Materials and Methods
    This prospective nonrandomized controlled study assigned patients to a control or MBSH group based on age and preference. The MBSH group watched episodes of “Headspace Guide to Meditation” on Netflix and practiced guided meditation at least twice per week for four weeks. Participants completed questionnaires assessing depression, anxiety, stress, insomnia, mindfulness, mental adjustment to cancer, and quality of life at weeks 0 and 8. Data were analyzed using a two-way repeated measures ANOVA.
  • Results
    Ninety-six patients participated, with 84 eligible for final analysis (44 control, 40 MBSH). Intention-to-treat analysis revealed a significant improvement in depression (f=4.306, p=0.041). Half of the experimental group (n=20) adhered to the study protocol. At week 8, the experimental group showed significant improvement compared to the control group in cognitive avoidance (f=8.530, p=0.005) and positive attitude (f=5.585, p=0.021), both indicative of adaptive coping strategies.
  • Conclusion
    This study firstly investigated the effect and feasibility of a Netflix-based MBSH program for breast cancer patients undergoing radiotherapy. Findings suggest MBSH on Netflix can improve mental health and adaptive mental adjustment, highlighting the potential of self-help mindfulness interventions to enhance the well-being of cancer patients and need for further research.
According to a 2020 cancer registry report, breast cancer was the most frequently diagnosed cancer among women in South Korea, with a crude incidence rate of 96.5 per 100,000 women and an annual increase of approximately 4.1% [1]. Despite high curability, approximately 50% of women with early breast cancer experience depression, anxiety, or both within the first year of diagnosis. These rates decline to 25% in subsequent years, reaching 15% in the fifth year [2]. Such findings highlight the ongoing psychological challenges that persist for a significant proportion of patients with breast cancer beyond the initial diagnosis period.
To address the need for complementary therapies for such patients, researchers have examined the use of mindfulness-based interventions. These interventions help patients enhance their quality of life, reduce stress and anxiety, and build resilience by cultivating present-moment focus, acceptance, and self-compassion. Previous studies have demonstrated the effectiveness of mindfulness-based interventions in supporting patients with breast cancer in coping with emotional distress and anxiety [3-5]. However, the extensive time and resource requirements of in-person sessions rendered these interventions impractical during the coronavirus disease 2019 (COVID-19) outbreak, as quarantine measures resulted in the cancellation or restriction of traditional class-based mindfulness programs that rely on personal contact and group settings.
During the quarantine period, the accessibility of mindfulness interventions for patients with cancer improved through alternative approaches such as the Headspace program on Netflix. Available as a series of short episodes, this program has widened the reach of mindfulness practices, including for patients with breast cancer. Mindfulness-based self-help (MBSH) programs delivered through streaming services represented a novel way to adapt to the circumstances engendered by the pandemic. Therefore, this study aimed to assess the effectiveness and feasibility of utilizing the Headspace program on Netflix to deliver self-guided mindfulness meditation to patients with breast cancer undergoing radiotherapy.
1. Study design
This experiment was a prospective nonrandomized controlled trial. Individuals were recruited from radiation oncology departments and were required to have met the following inclusion criteria: diagnosed with stage 0-III breast cancer, at least 20 years old, female, able to communicate in Korean, receiving adjuvant radiotherapy, and having an Eastern Cooperative Oncology Group performance score of 1 or lower. Those with a history of psychiatric diagnosis, suicidal tendencies, or double primary cancer were excluded. To minimize age-related bias, we ensured an equivalent number of participants in the experimental and control cohorts for age categories < 40, 40-49, and ≥ 50.
2. Procedure
Enrollment was open from August 1, 2021 to May 1, 2022. Participants were assigned to the control or experimental group based on their age group and preference. To access the mindfulness meditation program called Headspace Guide to Meditation (https://www.netflix.com/kr/title/81280926) and participate in the MBSH group, access to a Netflix account was necessary. Participants in the MBSH group could use their own accounts or a one-month free trial account provided by Netflix. Participants were instructed to watch Headspace Guide to Meditation sessions from week 1 to week 4 (1 month), twice per week. Variables were measured at two-time points: week 0 (pre) and week 8 (post). The pretest was carried out on the enrollment day. Participants completed the same questionnaires 1 month after 4-week MBSH session (week 8), which were administered during their regular one-month follow-up visit to the radiation oncology clinic. Compliance was based on participants’ self-reported frequency of meditation practice during the study period.
The Headspace Guide to Meditation streaming on Netflix consisted of eight 20-minute episodes, each of which focused on different aspects of mindfulness, including breathing exercises, body scanning, recognizing present emotions, and visualizing mental images. Although participants were advised to follow the episodes in order, they were free to choose when to view each episode.
Each session covered techniques and principles followed by a guided meditation exercise. The show included narration, animated visuals, and calming music, and was available in English and Korean with subtitles.
3. Outcome measures
The primary outcome measure was the Hospital Anxiety-Depression Scale (HADS) which measures anxiety and depression symptoms [6]. Secondary outcome measures were the Perceived Stress Scale gauging perceptions of stress and ability to manage stress [7], the Insomnia Severity Index measuring the severity of insomnia [8], and the Mental Health Continuum Short Form (MHC-SF) assessing emotional, social, and psychological well-being [9]. The Cognitive and Affective Mindfulness Scale-Revised (CAMS-R) uses 10 items to evaluate cognitive and affective mindfulness [10]. The mini-Mental Adjustment to Cancer (mini-MAC) comprises four subscales: helplessness/hopelessness, anxious preoccupation, cognitive avoidance (CA), and positive attitude (PA) [11].
The primary analysis followed the intention-to-treat (ITT) principle, whereby all participants were included regardless of protocol adherence. Additionally, a per-protocol (PP) analysis was conducted, including only those participants who met the protocol requirement for meditation practice.
4. Sample size
Based on previous data [12] regarding the mean difference of HADS between the control and experimental groups, a sample size of 64 participants was calculated as detecting a medium effect size of 0.4 with 95% power and a 5% type I error. To account for potential dropouts, we planned to enroll 48 patients in each arm, resulting in a total of 96 participants.
5. Statistical analysis
Demographic and clinical measurements were presented as means with standard deviations (SD) for continuous variables. Categorical variables were listed as both a number and percentage. To compare categorical variables between the two groups, either a chi-square test or Fisher’s exact test were performed depending on the sample size. A paired t test and a two-way repeated measures analysis of variance (ANOVA) test were conducted to compare self-reported data within and between groups at baseline and 8 weeks. A two-sided p-value of less than 0.05 was considered statistically significant for all analyses. All analyses were conducted using SPSS ver. 25 (IBM Corp.) and Stata/SE ver. 17.0 (StataCorp.).
1. Baseline characteristics
A total of 96 female participants were enrolled in the study, with 84 eligible for the ITT analysis (44 in the control and 40 in the experimental group) (Fig. 1). In the MBSH group, the compliance rate was 50%, with 20 participants meeting the minimum meditation practice requirement. Consequently, 20 participants in the MBSH group and 44 participants in the control group were eligible for PP analysis.
The baseline demographic and clinical characteristics of the 84 participants are presented in Table 1. All variables were well balanced between the two groups. No significant difference was observed in age group distribution between the groups (p=0.157). Overall, 4.4% and 10.0% in the control and MBSH groups, respectively, reported a history of psychiatric disorder. In addition, 70.5% of participants in the intervention group and 80.0% in the control group were within 0-6 months following their breast cancer diagnosis. No significant differences were observed in stage or molecular type between the groups. The control and MBSH groups exhibited similar baseline characteristics in terms of surgery, systemic therapy, and radiation therapy. S1 Table lists the baseline characteristics of the 64 participants in the PP sample, with no significant differences between the two groups at baseline.
2. Outcome measures
Table 2 presents the means and SD of the outcome measures by group and time of the ITT group. The two-way repeated measures ANOVA revealed a significant group×time interaction effect on depression (f=4.306, p=0.041). The control group exhibited no significant change (6.5±4.2 vs. 6.2±3.7, p=0.534), while the experimental group displayed a significant improvement in depression (6.7±3.5 vs. 5.2±2.7, p=0.007).
S2 Table presents the results of the PP analysis. The two-way repeated measures ANOVA revealed a significant group×time interaction for CA (f=8.530, p=0.005) and PA (f=5.585, p=0.021), reflecting adaptive coping strategies within the mini-MAC scale. For CA, the control group exhibited no significant change (26.0±3.8 vs. 25.6±4.3, p=0.201), whereas the experimental group displayed a significant increase (27.1±3.6 vs. 28.9±4.1, p=0.009). Similarly, for PA, the control group showed no significant change (10.1±2.5 vs. 10.1±2.3, p=0.814), while the experimental group exhibited a significant increase (9.3±2.9 vs. 10.74±2.5, p=0.026). Both results indicate an improvement in adaptive adjustment to cancer.
To the best of our knowledge, this is the first study to investigate the effect of MBSH via Netflix streaming in patients with breast cancer undergoing adjuvant radiotherapy during the COVID-19 pandemic. The study was conducted during the COVID-19 quarantine period in South Korea. Participants were assigned according to whether they had a Netflix account during the radiotherapy treatment period. We measured differences in depression, anxiety, stress, insomnia, well-being, mindfulness, and adjustment scales across time and groups.
In terms of the main findings, MBSH was effective in reducing depressive symptoms in ITT analysis. Moreover, it positively influenced mental adjustment to cancer by promoting better coping strategies in PP analysis. Specifically, CA and PA, two of the four subscales of the Mini-MAC scale, exhibited a significant improvement following the MBSH intervention. This highlights the effectiveness of MBSH in enhancing psychological resilience among patients with breast cancer. It is noteworthy that CA, generally considered a negative coping strategy in Western populations, may be perceived as an adaptive mechanism in Eastern societies. This may be because, in contrast to Europeans, CA enables the person in Korean society to escape from a threatening situation and high intrusion. This cultural difference suggests that interventions like MBSH might need to be tailored to accommodate diverse cultural perspectives on coping [11].
Our intervention program was based on Headspace, a mindfulness meditation application. This is one of the most popular programs offering guided mindfulness meditation sessions, with options to choose the topic and length. Numerous randomized studies using Headspace have been conducted, with at least 40% demonstrating improvement in depression, mindfulness, well-being, stress, and anxiety in the general population [13]. Regarding patients with cancer, Kubo et al. [14] conducted a study to assess the practicality and effectiveness of a mobile or online-based Headspace program in enhancing their quality of life and alleviating distress. They reported a significant improvement in quality of life among 97 patients with cancer after an 8-week program utilizing Headspace.
With the increasing popularity of streaming platforms, Headspace content has become available on Netflix since 2021, reaching a wider user base. We utilized the Headspace program due to its wide popularity and accessibility through mobile phone, websites, and television. Although Headspace has not been tested specifically with patients with breast cancer, several studies have explored the effects of other mobile application-based interventions on improving mental health among individuals diagnosed with breast cancer. BorjAlilu et al.’s [15] recent systemic review of seven randomized trials confirmed the positive impact of mobile apps on various aspects such as stress, depression, anxiety, self-efficacy, social support, resiliency, and coping with breast cancer. Despite variations in mobile applications and intervention durations ranging between 6 and 24 weeks, mental health interventions delivered through mobile apps could serve as a viable alternative to traditional face-to-face psychological sessions [16-20]. This is particularly relevant for women with breast cancer who may face unique challenges in managing their mental health. Few studies have examined the effectiveness of psychosocial interventions in patients with breast cancer during the radiotherapy treatment period. Among those that have, Henderson et al. [21] reported a significant improvement in 16 psychosocial outcomes among 40 participants receiving radiotherapy during the study period. Similarly, Kim et al. [22] performed a study on women receiving radiation therapy for breast cancer and reported significant improvements in anxiety, fatigue, and quality of life. Because this research was conducted in 2013, the pre-pandemic era, the intervention was on-site and involved in-person meditation therapy sessions during a 6-week radiation therapy period [22]. Given these results, the finding in this study that mental health can be improved through mindfulness meditation training via easily accessible OTT platforms is potentially significant. The radiation therapy is a psychologically challenging experience which could be exacerbated by social distancing due to COVID-19 pandemic for cancer patients. Thus, incorporating these easily accessible mindfulness services could be a valuable strategy to enhance the mental well-being of breast cancer patients during radiotherapy, particularly under the condition that patients are not easily accessible to the mindfulness-based intervention in person.
By leveraging the innovative Headspace platform, we aimed to address the psychological and emotional challenges faced by patients with breast cancer in an accessible and engaging manner, offering a unique approach to support their well-being. The study thus opens new avenues for integrating digital platforms into the comprehensive care of breast cancer. Another strength of our study lies in its independence from any conflict of interest as we did not receive any support or funding from the intervention program, thus ensuring the objectivity of our findings.
However, our study has a few limitations which need to be addressed. First, we did not assess the long-term effects. Secondly, the compliance rate was lower than that of intervention in person as we expected. The study required participants to watch the 20-minute meditation episodes at least twice a week. However, many participants failed to adhere to the program for various reasons such as a lack of time, COVID-19 infection, difficulty in incorporating the practice into their daily routines, or a lack of motivation. The low compliance rate may have compromised the overall effectiveness of the intervention, necessitating caution in interpreting the results. Thirdly, this study was not a randomized trial; participants were assigned to groups based on their preference, which could cause selection bias. Furthermore, because the Headspace program was developed within a Western cultural context, its efficacy and impact could differ within the Asian population, even with the availability of Korean translation.
Future research therefore needs to incorporate the potential ways to improve compliance among participants. Meditation can feel difficult and unfamiliar to beginners, so it is necessary to provide the accessory methods to improve compliance. Providing incentives for completing the program, personalized guidance, automated reminder, and follow-up calls to encourage and motivate participants could be effective to increase adherence to home assignments [23].
In conclusion, our study suggests that MBSH on the Netflix platform holds promise in improving mental health and quality of life outcomes for patients with breast cancer under the COVID pandemic situation. To the best of our knowledge, this is the first study to explore the potential benefits of mindfulness-based self-guided practice via an OTT platform and the results highlight the potential of self-help mindfulness interventions to enhance the well-being of such patients, particularly under the condition that patients are not easily accessible to the mindfulness-based intervention in person. Additional systematic study incorporating enhanced adherence strategies is needed to clarify the whole benefits of mindfulness-based self-guided practice via OTT platform.
Supplementary materials are available at Cancer Research and Treatment website (https://www.e-crt.org).

Ethical Statement

All participants were provided with a thorough explanation of the study and voluntarily signed an informed consent form prior to participation. This study protocol was approved by the Institutional Review Board of Seoul National University Bundang Hospital (IRB No. B-2106-690-301).

Author Contributions

Conceived and designed the analysis: Ryu H, Kim JH, Kim IA.

Collected the data: Ryu H, You SN, Kim B, Kim JH, Kim IA.

Contributed data or analysis tools: Ryu H, You SN, Oh S, Kim B, Kim JH, Kim IA.

Performed the analysis: Ryu H, You SN, Oh S, Kim B, Kim JH, Kim IA.

Wrote the paper: Ryu H, Kim JH, Kim IA.

Funding acquisition: Kim IA.

Conflict of Interest

Conflict of interest relevant to this article was not reported.

Funding

This work was supported by grants from the National Research Foundation of Korea (No. 2023R1A2C3003782) to In Ah Kim.

Fig. 1.
Flow chart of the study. ITT, intention-to-treat; PP, per-protocol.
crt-2024-955f1.jpg
Table 1.
Baseline characteristics of 84 participants in intention-to-treat sample
Characteristic Control (n=44) MBSH (n=40) p-value
Age group (yr)
 < 40 3 (6.8) 7 (17.5) 0.157
 40-49 23 (52.3) 23 (57.5)
 ≥ 50 18 (40.9) 10 (25.0)
Education
 High school 15 (34.1) 8 (20.0) 0.230
 College 29 (65.9) 32 (80.0)
Religion
 Yes 23 (52.3) 27 (67.5) 0.231
 No 21 (47.7) 13 (32.5)
Marital status
 Married 35 (79.5) 27 (67.5) 0.315
 Unmarried 9 (20.5) 13 (32.5)
Menopausal status
 Pre 31 (70.5) 34 (85.0) 0.183
 Post 13 (29.5) 6 (15.0)
Psychiatric history
 Yes 42 (95.5) 36 (90.0) 0.418
 No 2 (4.5) 4 (10.0)
Time since diagnosis (mo)
 0-6 31 (70.5) 34 (85.0) 0.183
 > 6 13 (29.5) 6 (15.0)
Clinical stage
 0 7 (15.9) 4 (10.0) 0.581
 1 20 (45.5) 15 (37.5)
 2 12 (27.3) 16 (40.0)
 3 5 (11.4) 5 (12.5)
Luminal type
 A 20 (45.5) 16 (41.0) 0.706
 B 16 (36.4) 15 (38.5)
 HER2 3 (6.8) 1 (2.6)
 TNBC 5 (11.4) 7 (17.9)
Bilateral
 No 44 (100) 38 (95.0) 0.224
 Yes 0 2 (5.0)
Type of surgery
 Breast conserving 29 (65.9) 29 (72.5) 0.677
 Total mastectomy 15 (34.1) 11 (27.5)
Axilla surgery
 None 10 (22.7) 10 (25.0) 0.658
 Sentinel node biopsy 19 (43.2) 20 (50.0)
 ALND 15 (34.1) 10 (25.0)
Reconstruction
 No 32 (72.7) 33 (82.5) 0.419
 Yes 12 (27.3) 7 (17.5)
Chemotherapy
 None 22 (50.0) 16 (40.0) 0.607
 Adjuvant 11 (25.0) 10 (25.0)
 Adj and neoadjuvant 9 (20.5) 13 (32.5)
 Neoadjuvant 2 (4.5) 1 (2.5)
Hormonal therapy
 No 9 (20.5) 8 (20.0) > 0.99
 Yes 35 (79.5) 32 (80.0)
Herceptin therapy
 No 36 (81.8) 34 (85.0) 0.922
 Yes 8 (18.2) 6 (15.0)
RT field
 Breast 22 (50.0) 24 (60.0) 0.262
 Breast and regional node 22 (50.0) 16 (40.0)
RT dose (Gy)
 42.5-52.56 27 (61.4) 28 (70.0) 0.406
 55-60 17 (38.6) 12 (30.0)
RT fraction number
 16-21 33 (75.0) 36 (90.0) 0.073
 25-30 11 (25.0) 4 (10.0)

Values are presented as number (%). ALND, axillary lymph node dissection; HER2, human epidermal growth factor receptor 2; MBSH, mindfulness-based self-help; RT, radiotherapy; TNBC, triple negative breast cancer.

Table 2.
Two-way repeated measure ANOVA and paired T-test for control and mindfulness-based self-help (MBSH) groups in intention-to-treat sample (n=84)
Outcome Control (n=44)
MBSH (n=40)
Two-way repeated measure ANOVA
Pre Post p-value Pre Post p-value Group (F, P) Time (F, P) Time×Group (F, P)
Perceived Stress Scale 17.4±6.6 16.7±7.2 0.171 16.4±6.2 13.6±4.5 0.001* 2.887, 0.093 9.249, 0.003* 3.099, 0.082
Hospital Anxiety Depression 13.7±7.5 13.0±7.5 0.685 14.0±5.9 11.0±5.1 < 0.001* 0.413, 0.522 9.690, 0.003* 3.640, 0.060
Depression 6.5±4.2 6.2±3.7 0.534 6.7±3.5 5.2±2.7 0.007* 0.267, 0.607 9.799, 0.002* 4.306, 0.041*
Anxiety 7.2±3.9 6.9±4.3 0.793 7.2±3.1 5.9±3.1 0.001* 0.446, 0.506 5.921, 0.017* 1.847, 0.178
Insomnia Severity Index 8.7±4.6 9.1±4.9 1.000 9.4±4.8 8.9±5.0 0.389 0.079, 0.780 0.009, 0.926 1.077, 0.302
Quality of life 31.1±13.3 31.9±14.2 0.530 35.3±12.3 37.7±12.6 0.257 3.633, 0.060 2.032, 0.158 0.476, 0.492
Emotional QOL 6.6±3.7 7.0±4.0 0.412 7.5±2.7 8.9±3.1 0.009* 4.244, 0.043* 6.561, 0.012* 1.532, 0.219
Social QOL 9.6±5.1 10.3±5.3 0.268 11.4±5.1 11.8±4.9 0.538 2.454, 0.121 1.493, 0.225 0.101, 0.751
Psychologic QOL 14.9±6.2 14.6±6.3 0.710 16.4±5.7 17.1±5.9 0.646 2.935, 0.090 0.153, 0.696 0.771, 0.382
Mindfulness 26.4±5.4 27.0±5.1 0.252 26.9±4.9 27.7±6.0 0.338 0.343, 0.560 1.947, 0.167 0.025, 0.875
Awareness 10.1±2.2 10.4±2.1 0.351 10.1±2.3 10.7±2.9 0.196 0.095, 0.759 4.017, 0.048* 0.372, 0.543
Attention 11.1±2.6 11.3±2.5 0.449 11.7±2.4 11.4±2.8 0.567 0.493, 0.484 0.000, 0.996 0.749, 0.389
Acceptance 5.2±1.6 5.3±1.2 0.913 5.2±1.2 5.6±1.3 0.038* 0.258, 0.613 2.384, 0.126 1.392, 0.241
Mini-MAC 70.0±6.3 67.8±6.3 0.010 69.3±7.2 66.8±6.1 0.011* 0.428, 0.515 12.410, 0.001 0.021, 0.885
Helplessness-hopelessness 13.5±4.5 12.6±3.9 0.091 12.3±3.6 11.5±3.7 0.108 2.418, 0.124 4.549, 0.036* 0.040, 0.842
Anxiety preoccupation 20.5±4.9 19.7±4.3 0.115 19.4±4.8 17.8±4.8 0.001* 2.501, 0.118 11.670, 0.001* 1.342, 0.250
Cognitive avoidance 26.0±3.8 25.6±4.3 0.201 26.6±4.0 27.2±4.9 0.438 1.695, 0.197 0.065, 0.800 1.926, 0.169
Positive attitude 10.1±2.5 10.1±2.3 0.814 9.0±2.6 9.7±2.7 0.196 2.604, 0.110 2.357, 0.129 1.677, 0.199

Values are presented as mean±standard deviation. MBSH, mindfulness-based self-help; mini-MAC, mini-mental adjustment to cancer; QOL, quality of life. An asterisk (*) indicates statistical significance with a p-value less than 0.05.

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        Evaluating the Effects of Mindfulness-Based Self-Help via an OTT Platform on Breast Cancer Patients Undergoing Radiotherapy: A Prospective Nonrandomized Controlled Trial
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      Evaluating the Effects of Mindfulness-Based Self-Help via an OTT Platform on Breast Cancer Patients Undergoing Radiotherapy: A Prospective Nonrandomized Controlled Trial
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      Fig. 1. Flow chart of the study. ITT, intention-to-treat; PP, per-protocol.
      Evaluating the Effects of Mindfulness-Based Self-Help via an OTT Platform on Breast Cancer Patients Undergoing Radiotherapy: A Prospective Nonrandomized Controlled Trial
      Characteristic Control (n=44) MBSH (n=40) p-value
      Age group (yr)
       < 40 3 (6.8) 7 (17.5) 0.157
       40-49 23 (52.3) 23 (57.5)
       ≥ 50 18 (40.9) 10 (25.0)
      Education
       High school 15 (34.1) 8 (20.0) 0.230
       College 29 (65.9) 32 (80.0)
      Religion
       Yes 23 (52.3) 27 (67.5) 0.231
       No 21 (47.7) 13 (32.5)
      Marital status
       Married 35 (79.5) 27 (67.5) 0.315
       Unmarried 9 (20.5) 13 (32.5)
      Menopausal status
       Pre 31 (70.5) 34 (85.0) 0.183
       Post 13 (29.5) 6 (15.0)
      Psychiatric history
       Yes 42 (95.5) 36 (90.0) 0.418
       No 2 (4.5) 4 (10.0)
      Time since diagnosis (mo)
       0-6 31 (70.5) 34 (85.0) 0.183
       > 6 13 (29.5) 6 (15.0)
      Clinical stage
       0 7 (15.9) 4 (10.0) 0.581
       1 20 (45.5) 15 (37.5)
       2 12 (27.3) 16 (40.0)
       3 5 (11.4) 5 (12.5)
      Luminal type
       A 20 (45.5) 16 (41.0) 0.706
       B 16 (36.4) 15 (38.5)
       HER2 3 (6.8) 1 (2.6)
       TNBC 5 (11.4) 7 (17.9)
      Bilateral
       No 44 (100) 38 (95.0) 0.224
       Yes 0 2 (5.0)
      Type of surgery
       Breast conserving 29 (65.9) 29 (72.5) 0.677
       Total mastectomy 15 (34.1) 11 (27.5)
      Axilla surgery
       None 10 (22.7) 10 (25.0) 0.658
       Sentinel node biopsy 19 (43.2) 20 (50.0)
       ALND 15 (34.1) 10 (25.0)
      Reconstruction
       No 32 (72.7) 33 (82.5) 0.419
       Yes 12 (27.3) 7 (17.5)
      Chemotherapy
       None 22 (50.0) 16 (40.0) 0.607
       Adjuvant 11 (25.0) 10 (25.0)
       Adj and neoadjuvant 9 (20.5) 13 (32.5)
       Neoadjuvant 2 (4.5) 1 (2.5)
      Hormonal therapy
       No 9 (20.5) 8 (20.0) > 0.99
       Yes 35 (79.5) 32 (80.0)
      Herceptin therapy
       No 36 (81.8) 34 (85.0) 0.922
       Yes 8 (18.2) 6 (15.0)
      RT field
       Breast 22 (50.0) 24 (60.0) 0.262
       Breast and regional node 22 (50.0) 16 (40.0)
      RT dose (Gy)
       42.5-52.56 27 (61.4) 28 (70.0) 0.406
       55-60 17 (38.6) 12 (30.0)
      RT fraction number
       16-21 33 (75.0) 36 (90.0) 0.073
       25-30 11 (25.0) 4 (10.0)
      Outcome Control (n=44)
      MBSH (n=40)
      Two-way repeated measure ANOVA
      Pre Post p-value Pre Post p-value Group (F, P) Time (F, P) Time×Group (F, P)
      Perceived Stress Scale 17.4±6.6 16.7±7.2 0.171 16.4±6.2 13.6±4.5 0.001* 2.887, 0.093 9.249, 0.003* 3.099, 0.082
      Hospital Anxiety Depression 13.7±7.5 13.0±7.5 0.685 14.0±5.9 11.0±5.1 < 0.001* 0.413, 0.522 9.690, 0.003* 3.640, 0.060
      Depression 6.5±4.2 6.2±3.7 0.534 6.7±3.5 5.2±2.7 0.007* 0.267, 0.607 9.799, 0.002* 4.306, 0.041*
      Anxiety 7.2±3.9 6.9±4.3 0.793 7.2±3.1 5.9±3.1 0.001* 0.446, 0.506 5.921, 0.017* 1.847, 0.178
      Insomnia Severity Index 8.7±4.6 9.1±4.9 1.000 9.4±4.8 8.9±5.0 0.389 0.079, 0.780 0.009, 0.926 1.077, 0.302
      Quality of life 31.1±13.3 31.9±14.2 0.530 35.3±12.3 37.7±12.6 0.257 3.633, 0.060 2.032, 0.158 0.476, 0.492
      Emotional QOL 6.6±3.7 7.0±4.0 0.412 7.5±2.7 8.9±3.1 0.009* 4.244, 0.043* 6.561, 0.012* 1.532, 0.219
      Social QOL 9.6±5.1 10.3±5.3 0.268 11.4±5.1 11.8±4.9 0.538 2.454, 0.121 1.493, 0.225 0.101, 0.751
      Psychologic QOL 14.9±6.2 14.6±6.3 0.710 16.4±5.7 17.1±5.9 0.646 2.935, 0.090 0.153, 0.696 0.771, 0.382
      Mindfulness 26.4±5.4 27.0±5.1 0.252 26.9±4.9 27.7±6.0 0.338 0.343, 0.560 1.947, 0.167 0.025, 0.875
      Awareness 10.1±2.2 10.4±2.1 0.351 10.1±2.3 10.7±2.9 0.196 0.095, 0.759 4.017, 0.048* 0.372, 0.543
      Attention 11.1±2.6 11.3±2.5 0.449 11.7±2.4 11.4±2.8 0.567 0.493, 0.484 0.000, 0.996 0.749, 0.389
      Acceptance 5.2±1.6 5.3±1.2 0.913 5.2±1.2 5.6±1.3 0.038* 0.258, 0.613 2.384, 0.126 1.392, 0.241
      Mini-MAC 70.0±6.3 67.8±6.3 0.010 69.3±7.2 66.8±6.1 0.011* 0.428, 0.515 12.410, 0.001 0.021, 0.885
      Helplessness-hopelessness 13.5±4.5 12.6±3.9 0.091 12.3±3.6 11.5±3.7 0.108 2.418, 0.124 4.549, 0.036* 0.040, 0.842
      Anxiety preoccupation 20.5±4.9 19.7±4.3 0.115 19.4±4.8 17.8±4.8 0.001* 2.501, 0.118 11.670, 0.001* 1.342, 0.250
      Cognitive avoidance 26.0±3.8 25.6±4.3 0.201 26.6±4.0 27.2±4.9 0.438 1.695, 0.197 0.065, 0.800 1.926, 0.169
      Positive attitude 10.1±2.5 10.1±2.3 0.814 9.0±2.6 9.7±2.7 0.196 2.604, 0.110 2.357, 0.129 1.677, 0.199
      Table 1. Baseline characteristics of 84 participants in intention-to-treat sample

      Values are presented as number (%). ALND, axillary lymph node dissection; HER2, human epidermal growth factor receptor 2; MBSH, mindfulness-based self-help; RT, radiotherapy; TNBC, triple negative breast cancer.

      Table 2. Two-way repeated measure ANOVA and paired T-test for control and mindfulness-based self-help (MBSH) groups in intention-to-treat sample (n=84)

      Values are presented as mean±standard deviation. MBSH, mindfulness-based self-help; mini-MAC, mini-mental adjustment to cancer; QOL, quality of life. An asterisk (*) indicates statistical significance with a p-value less than 0.05.


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