Purpose
Cancer and its treatment may affect cognitive function through a number of direct and indirect pathways including inflammation, lipid metabolism, vascular damage, and changes in the blood brain barrier. While short-term treatment-related cognitive changes are well recognized, only limited research is available in older, long-term survivors of cancer.
Methods
Using NHANES data from 1999 through 2002, 408 cancer survivors and 2,639 non-cancer participants age 60 and above were identified. Cognitive function of these groups were compared using the Digit Symbol Substitution Test (DSST) and self-reported problems with memory or confusion.
Results
After adjustment for covariates, cancer survivors scored, on average, 1.99 points lower on the DSST compared to non-cancer survivors (−1.99, 95%CI −3.94, −0.05) Cancer survivors also had 17% higher odds of self-reporting problems with memory or confusion (OR 1.17, 95%CI 0.89, 1.53).
Conclusion
In this nationally-representative sample of older U.S. adults, cancer survivors had lower DSST scores than non-survivors and had more self-reported problems with memory or confusion.