• Judith E Carroll, Brent J Small, Danielle B Tometich, Wanting Zhai, Xingtao Zhou, George Luta, Tim A Ahles, Andrew J Saykin, Kelly N H Nudelman, Jonathan D Clapp, Heather S Jim, Paul B Jacobsen, Arti Hurria, Deena Graham, Brenna C McDonald, Neelima Denduluri, Martine Extermann, Claudine Isaacs, Asma A Dilawari, James Root, Robert A Stern, Jeanne S Mandelblatt, and Thinking and Living With Cancer Study.
• Norman Cousins Center for Psychoneuroimmunology, Department of Psychiatry & Biobehavioral Sciences, Jane and Terry Semel Institute for Neuroscience and Human Behavior, Jonsson Comprehensive Cancer Center, David Geffen School of Medicine, University of California Los Angeles, Los Angeles, California.
• Cancer. 2019 Dec 15; 125 (24): 4516-4524.

BackgroundSleep disturbance and genetic profile are risks for cognitive decline in noncancer populations, yet their role in cancer-related cognitive problems remains understudied. This study examined whether sleep disturbance was associated with worse neurocognitive outcomes in breast cancer survivors and whether sleep effects on cognition varied by genotype.MethodsNewly diagnosed female patients (n = 319) who were 60 years old or older and had stage 0 to III breast cancer were recruited from August 2010 to December 2015. Assessments were performed before systemic therapy and 12 and 24 months later. Neuropsychological testing measured attention, processing speed, executive function, learning, and memory; self-perceived cognitive functioning was also assessed. Sleep disturbance was defined by self-report of routine poor or restless sleep. Genotyping included APOE, BDNF, and COMT polymorphisms. Random effects fluctuation models tested associations of between-person and within-person differences in sleep, genotype, and sleep-genotype interactions and cognition and controlled for age, reading level, race, site, and treatment.ResultsOne-third of the patients reported sleep disturbances at each time point. There was a sleep-APOE ε4 interaction (P = .001) in which patients with the APOE ε4 allele and sleep disturbances had significantly lower learning and memory scores than those who were APOE ε4-negative and without sleep disturbances. There was also a sleep disturbance-COMT genotype interaction (P = .02) in which COMT Val carriers with sleep disturbances had lower perceived cognition than noncarriers.ConclusionsSleep disturbance was common and was associated with worse cognitive performance in older breast cancer survivors, especially those with a genetic risk for cognitive decline. Survivorship care should include sleep assessments and interventions to address sleep problems.© 2019 American Cancer Society.

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