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.
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Data availability
Data will be made available upon reasonable request to the first author in accordance with the guidelines of the National Cancer Institute.
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Acknowledgements
We thank the study participants, professionals, and members of Love Research Army (formerly the Army of Women) and the research professionals at Memorial Sloan Kettering Cancer Center and City of Hope Comprehensive Cancer Center.
Funding
This research was supported by grants from the National Cancer Institute (TA: R01 CA172119, U54 CA137788, P30 CA008748), the American Cancer Society (SKP: RSG-17–023-01-CPPB), and the Internal MSK grants (IO: Society of MSK, Brain Tumor Center Award).
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Tim Ahles, Arti Hurria, Irene Orlow, Elizabeth Ryan, and James Root contributed to the study conception and design. Statistical analyses were conducted by Yuelin Li and Elizabeth Schofield. Data collection and material preparation were performed by Katrazyna McNeal, Heidi Tan, Vani Katheria, Jessica Vazquez, Sergio Corrales–Guerrero, and Keimya Sadeghi. The first draft of the manuscript was written by Tim Ahles, and all authors commented on previous versions. All authors read and approved the final manuscript.
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All methods and procedures were approved by the institutional review boards of Memorial Sloan Kettering Cancer Center and City of Hope Comprehensive Cancer Center.
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This paper is dedicated to the memory of Arti Hurria, MD, FASCO, who was a world leader in breast cancer and geriatric oncology.
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Ahles, T.A., Orlow, I., Schofield, E. et al. The impact of APOE and smoking history on cognitive function in older, long-term breast cancer survivors. J Cancer Surviv 18, 575–585 (2024). https://doi.org/10.1007/s11764-022-01267-z
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DOI: https://doi.org/10.1007/s11764-022-01267-z