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Cognitive function after the initiation of adjuvant endocrine therapy in early-stage breast cancer: an observational
Patricia A Ganz1, Laura Petersen2, Steven A Castellon2
1Patricia A. Ganz, Thomas R. Belin, Fielding School of Public Health, University of California, Los Angeles; Patricia A. Ganz, Laura Petersen, Jonsson Comprehensive Cancer Center, University of California, Los Angeles; Patricia A. Ganz, Daniel H.S. Silverman, Steven W. Cole, Michael R. Irwin, David Geffen School of Medicine, University of California, Los Angeles; Steven A. Castellon, VA Greater Los Angeles Health Care System; Steven A. Castellon, Julienne E. Bower, University of California, Los Angeles; Julienne E. Bower, Steven W. Cole, Michael R. Irwin, Cousins Center for Psychoneuroimmunology, Semel Institute, University of California, Los Angeles, Los Angeles, CA. pganz@mednet.ucla.edu.
Purpose:
This report examines cognitive complaints and neuropsychological (NP) testing outcomes in patients with early-stage breast cancer after the initiation of endocrine therapy (ET) to determine whether this therapy plays any role in post-treatment cognitive complaints.
Patients And Methods:
One hundred seventy-three participants from the Mind Body Study (MBS) observational cohort provided data from self-report questionnaires and NP testing obtained at enrollment (T1, before initiation of ET), and 6 months later (T2). Bivariate analyses compared demographic and treatment variables, cognitive complaints, depressive symptoms, quality of life, and NP functioning between those who received ET versus not. Multivariable linear regression models examined predictors of cognitive complaints at T2, including selected demographic variables, depressive symptoms, ET use, and other medical variables, along with NP domains that were identified in bivariate analyses.
Results:
Seventy percent of the 173 MBS participants initiated ET, evenly distributed between tamoxifen or aromatase inhibitors. ET-treated participants reported significantly increased language and communication (LC) cognitive complaints at T2 (P = .003), but no significant differences in NP test performance. Multivariable regression on LC at T2 found higher LC complaints significantly associated with T1 LC score (P < .001), ET at T2 (P = .004), interaction between ET and past hormone therapy (HT) (P < .001), and diminished improvement in NP psychomotor function (P = .05). Depressive symptoms were not significant (P = .10).
Conclusion:
Higher LC complaints are significantly associated with ET 6 months after starting treatment and reflect diminished improvements in some NP tests. Past HT is a significant predictor of higher LC complaints after initiation of ET.
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