Cancer treatments are suspected to accelerate certain aging processes in the body. A new study has found that indicators of such biological aging correlate with declines in cognitive function in women who had undergone breast cancer treatment several years earlier. Published early online in CANCER, and a peer-reviewed journal of the American Cancer Society, findings point to an aging-like effect of cancer treatments and further connect this to cognitive decline.
Treatments for breast cancer increase the risk of long-term and late toxicity, including persistent fatigue, pain, and cognitive dysfunction. Certain treatments, including radiation and some chemotherapeutic drugs, work by damaging the DNA of cancer cells, but they can also cause damage to DNA of normal cells, which can contribute to accelerated biological aging.
To examine whether indicators of biological aging are related to cognitive function in breast cancer survivors, Judith E. Carroll, PhD, Associate Professor of Psychiatry, of the UCLA Cousins Center for Psychoneuroimmunology and the Semel Institute for Neuroscience and Human Behavior, and her colleagues evaluated and a group of 94 women who had been treated for breast cancer three to six years earlier. The indicators of biological aging included elevated levels of DNA damage, reduced telomerase enzymatic activity, and shorter telomere length in certain blood cells. (Telomerase is an enzyme that is important for the maintenance of the length of the telomeres, repeating sequences of DNA at the ends of the chromosomes that help maintain the health of cells and serve as a marker of cell age.)
The team found that women who had previously been treated for breast cancer who had both higher DNA damage and lower telomerase activity had lower executive function scores. In addition, lower telomerase activity was associated with a lower focus and motor speed. Telomere length was not related to any of the neurocognitive domains.
"These findings are important because they provide additional information on what could be happening after a cancer treatment that impacts cognitive decline in some individuals." Carroll, who is also a member of the UCLA Jonsson Comprehensive Cancer Center. "The work is novel by identifying key factors in biological aging and connecting them to cognitive function, which initiates new avenues of research."
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