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The Effects of Light Therapy on Cognitive Function and Stress in Women With Breast Cancer Before Systemic Treatment
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The Effects of Light Therapy on Cognitive Function and Stress in Women With Breast Cancer Before Systemic Treatment
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Journal Article
The Effects of Light Therapy on Cognitive Function and Stress in Women With Breast Cancer Before Systemic Treatment
2025
Overview
ABSTRACT
Background
Cancer‐related cognitive impairment (CRCI), for example, impairments in reaction time, processing speed, memory and executive function, may be associated with breast cancer (BC) surgery which can disrupt biological and psychological stress markers. Evidence suggests that light therapy may ameliorate cognitive impairment and stress. In this double‐blind, randomized controlled trial, we investigated the efficacy of light therapy on mitigating the impact of BC surgery on CRCI in a national Icelandic cohort of women with BC.
Methods
Participants were randomly allocated to receive circadian‐effective blue light (BL, N = 60) or circadian‐ineffective dim light (DL, N = 57) for 4 weeks after surgery. The primary outcome was overall cognitive performance (assessed via global composite score), and secondary outcomes were specific cognitive domains, cognitive complaints, psychological (depressive symptoms, overall cancer‐related stress and its symptoms: hyperarousal, avoidance, and intrusive thoughts) and biological (cortisol and α‐amylase) stress markers. Linear regression and path analyses within structural equation modeling frameworks were conducted, adjusted for baseline cognitive performance, age, education, subsequent cancer treatment, cancer stage, and treatment credibility.
Results
No group differences were found in overall cognitive performance or in specific cognitive domains, except for a non‐significant trend for faster reaction times in the BL group (p < 0.11). Additionally, the BL group reported significantly fewer cognitive complaints compared with the DL group (p < 0.05), as well as a non‐significant trend for less intrusive thoughts (p < 0.11). No group differences were observed in the biological stress markers.
Conclusion
Overall, these findings suggest that light therapy may help mitigate the adverse effects associated with BC surgery on CRCI and intrusive thoughts, although further research is warranted.
Trial Registration: NCT04418856
Publisher
John Wiley & Sons, Inc,Wiley
Subject
/ Aged
/ Breast Neoplasms - complications
/ Breast Neoplasms - psychology
/ cancer‐related cognitive impairment
/ Cognition - radiation effects
/ Cognitive Dysfunction - etiology
/ Cognitive Dysfunction - therapy
/ cortisol
/ Female
/ Hormones
/ Humans
/ Memory
/ Post traumatic stress disorder
/ Stress, Psychological - etiology
/ Stress, Psychological - therapy
/ Surgery
