Abstract
ObjectiveTo investigate whether treatment of cancer with chemotherapy, as compared with surgery and radiation, differentially affects cognitive functioning in older adults. DesignLatent class growth analysis approach. SettingHealth and Retirement Study. ParticipantsOlder adults (N=403) with a new diagnosis of cancer who were still alive 4 years after their diagnosis. InterventionsNot applicable. Main Outcome MeasuresCognition (degree of immediate recall and delayed recall of a word list). ResultsFindings indicated that 3 classes of cognitive functioning best fit the data, specifically high, middle, and low recall classes. Individuals treated with chemotherapy were significantly more likely to be in the high recall class, with no effect of receiving surgery or radiation. When interactions with demographic predictors were entered into the model, an Age × Treatment interaction was present such that individuals younger than 80 years were more likely to both receive chemotherapy and have high recall cognition. ConclusionsThree distinct classes of cognitive functioning emerged in older adults with cancer. Treatment with chemotherapy predicted likely membership in the high recall class in this sample of cancer survivors; however, this was due to an Age × Treatment interaction. Implications for understanding cognitive sequelae of cancer in late life are discussed.
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