Abstract
Purpose
During chemotherapy, women with breast cancer not only experience poor quality of life (QOL), they also have little exposure to bright light, which has been shown to be associated with depression, fatigue, and poor sleep in other chronic illnesses. This study examined whether increased light exposure would have a positive effect on QOL.
Methods
Thirty-nine women with stage I–III breast cancer scheduled to receive ≥4 cycles of chemotherapy were randomized to a bright white light (BWL, n = 23) or dim red light (DRL, n = 16) treatment group. Data were collected before (baseline) and during cycles 1 and 4 of chemotherapy. Light was administered via a light box (Litebook®, Ltd.). QOL was assessed with the Functional Assessment of Cancer Therapy-Breast (FACT-B) and the Functional Outcomes of Sleep Questionnaire (FOSQ).
Results
Compared with baseline, the DRL group demonstrated significant decline in QOL during the treatment weeks of both cycles (all ps < 0.02), whereas the BWL group had no significant decline (all ps > 0.05). Mixed model analyses revealed that there was a group-by-time interaction for FOSQ at the treatment week of cycle 4, and this interaction was mediated by fatigue.
Conclusion
The data suggest that increased exposure to bright light during chemotherapy may prevent the decline in QOL via preventing the increase in fatigue.
Abbreviations
- QOL:
-
Quality of life
- UCSD:
-
University of California, San Diego
- BWL:
-
Bright white light
- DRL:
-
Dim red light
- FACT-B:
-
Functional assessment of cancer therapy-breast
- FOSQ:
-
Functional Outcomes of Sleep Questionnaire
- CES-D:
-
Center for Epidemiologic Studies Depression Scale
- TST:
-
Total sleep time
- NAPTIME:
-
Total nap time
- C1TW:
-
Chemotherapy treatment week of cycle 1
- C1RW:
-
Last week (recovery week) of cycle 1
- C4TW:
-
Chemotherapy treatment week of cycle 4
- C4RW:
-
Last week (recovery week) of cycle 4
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Acknowledgments
This study was supported by California Breast Cancer Research Program 11IB-0034, a grant from Litebook, Inc, NCI CA112035, UL1RR031980 (CTRI), the UCSD Moores Cancer Center (NCI P30 CA23100), Department of Veterans Affairs Center of Excellence for Stress and Mental Health (CESAMH), the Stein Institute for Research on Aging, and the National Institute on Aging T35 grant AG026757.
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Jeste, N., Liu, L., Rissling, M. et al. Prevention of quality-of-life deterioration with light therapy is associated with changes in fatigue in women with breast cancer undergoing chemotherapy. Qual Life Res 22, 1239–1244 (2013). https://doi.org/10.1007/s11136-012-0243-2
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DOI: https://doi.org/10.1007/s11136-012-0243-2