Abstract
Purpose
Bright light therapy holds promise for reducing common symptoms, e.g., fatigue, experienced by individuals with cancer. This study aimed to examine the effects of a chronotype-tailored bright light intervention on sleep disturbance, fatigue, depressive mood, cognitive dysfunction, and quality of life among post-treatment breast cancer survivors.
Methods
In this two-group randomized controlled trial (NCT03304587), participants were randomized to receive 30-min daily bright blue-green light (12,000 lx) or dim red light (5 lx) either between 19:00 and 20:00 h or within 30 min of waking in the morning. Self-reported outcomes and in-lab overnight polysomnography sleep study were assessed before (pre-test) and after the 14-day light intervention (post-test).
Results
The sample included 30 women 1–3 years post-completion of chemotherapy and/or radiation for stage I to III breast cancer (mean age = 52.5 ± 8.4 years). There were no significant between-group differences in any of the symptoms or quality of life (all p > 0.05). However, within each group, self-reported sleep disturbance, fatigue, depressive mood, cognitive dysfunction, and quality of life-related functioning showed significant improvements over time (all p < 0.05); the extent of improvement for fatigue and depressive mood was clinically relevant. Polysomnography sleep findings showed that a number of awakenings significantly decreased (p = 0.011) among participants who received bright light, while stage 2 sleep significantly increased (p = 0.015) among participants who received dim-red light.
Conclusion
The findings support using light therapy to manage post-treatment symptoms in breast cancer survivors. The unexpected symptom improvements among dim-red light controls remain unexplained and require further investigation.
Trial registration
ClinicalTrials.gov Identifier: NCT03304587, October 19, 2017.
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Data availability
The data that support the findings of this study are available on request from the corresponding author. The data are not publicly available due to privacy or ethical restrictions.
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Acknowledgements
This study was supported by the National Institutes of Health, National Institute of Nursing Research grant number: R15NR016828.
Funding
This study was supported by the National Institutes of Health, National Institute of Nursing Research grant number: R15NR016828.
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Horng-Shiuann Wu, Jean E. Davis, and Feng Gao contributed to the study conception and design. Material preparation, data collection, and analysis were performed by Horng-Shiuann Wu, Feng Gao, and Charles W. Given. The first draft of the manuscript was written by Horng-Shiuann Wu and Feng Gao and all authors commented on all versions of the manuscript. All authors read and approved the final manuscript.
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The study was performed in line with the principles of the Declaration of Helsinki. It was approved by the Institutional Review Boards at Michigan State University in East Lansing, Michigan (IRB #2776) and the Human Investigation Committee at Washington University in St. Louis, Missouri (HRPO#201703147).
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Informed consent was obtained from all individual participants included in the study.
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The authors declare no competing interests
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Wu, HS., Gao, F., Davis, J.E. et al. Effects of chronotype-tailored bright light intervention on post-treatment symptoms and quality of life in breast cancer survivors. Support Care Cancer 31, 705 (2023). https://doi.org/10.1007/s00520-023-08157-9
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DOI: https://doi.org/10.1007/s00520-023-08157-9