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Published in: Journal of Cancer Survivorship 2/2024

24-10-2022 | Breast Cancer

The impact of APOE and smoking history on cognitive function in older, long-term breast cancer survivors

Authors: Tim A. Ahles, Irene Orlow, Elizabeth Schofield, Yuelin Li, Elizabeth Ryan, James C. Root, Sunita K. Patel, Katrazyna McNeal, Alexandra Gaynor, Heidi Tan, Vani Katheria, Jessica Vazquez, Sergio Corrales–Guerrero, Keimya Sadeghi, Tiffany Traina, Arti Hurria

Published in: Journal of Cancer Survivorship | Issue 2/2024

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Abstract

Purpose

This study aims to determine whether older breast cancer survivors score lower on neuropsychological tests compared to matched non-cancer controls and to test the hypotheses that survivors who were APOE ε4 carriers would have the lowest cognitive performance but that smoking history would decrease the negative effect of ε4 on cognition.

Methods

Female breast cancer survivors who had been diagnosed and treated at age 60 or older and were 5–15-year survivors (N = 328) and age and education matched non-cancer controls (N = 162) were assessed at enrollment and at 8-, 16-, and 24-month follow-ups with standard neuropsychological and psychological assessments. Blood for APOE genotyping was collected, and smoking history was assessed at enrollment. Participants were purposely recruited so that approximately 50% had a history of treatment with chemotherapy or no chemotherapy and approximately 50% had a smoking history.

Results

After adjusting for age, cognitive reserve, depression, and fatigue, breast cancer survivors scored significantly lower on all domains of cognitive function. A significant two-way interaction demonstrated that the negative effect of ε4 on cognitive performance was stronger among survivors. A significant three-way interaction supported the hypothesis that smoking history had a protective effect on cognitive function in ε4 carriers that was more pronounced in the controls than the survivors.

Conclusions

The results support the long-term cognitive impact of breast cancer diagnosis and treatments on older, disease-free survivors, particularly for ε4 carriers. The results also emphasize the importance of assessing smoking history when examining APOE and cognition and are an example of the complex interactions of age, genetics, health behaviors, and disease history in determining cognitive function.

Implications for Cancer Survivors

These results help explain why only a subset of breast cancer survivors appear to be vulnerable to cognitive problems.
Appendix
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Metadata
Title
The impact of APOE and smoking history on cognitive function in older, long-term breast cancer survivors
Authors
Tim A. Ahles
Irene Orlow
Elizabeth Schofield
Yuelin Li
Elizabeth Ryan
James C. Root
Sunita K. Patel
Katrazyna McNeal
Alexandra Gaynor
Heidi Tan
Vani Katheria
Jessica Vazquez
Sergio Corrales–Guerrero
Keimya Sadeghi
Tiffany Traina
Arti Hurria
Publication date
24-10-2022
Publisher
Springer US
Published in
Journal of Cancer Survivorship / Issue 2/2024
Print ISSN: 1932-2259
Electronic ISSN: 1932-2267
DOI
https://doi.org/10.1007/s11764-022-01267-z

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