Neuroscience and Cognitive Health

Researchers at the University of Rochester Medical Center, analyzing blood samples and cognitive tests from about 1,400 long‑term survivors treated at St. Jude Children’s Research Hospital, report that chemotherapy and radiation in childhood or young adulthood appear to accelerate biological aging of the brain. Using epigenetic clocks that estimate biological age from chemical tags on DNA, they found many survivors showed age‑advanced cellular profiles, particularly those heavily exposed to chemotherapy, which is known to damage DNA and normal cells along with tumors. Survivors whose biological age was most accelerated performed worse on neurocognitive tests of memory, attention and processing speed, supporting links long suspected under the umbrella of so‑called “chemo brain.” The team, led by epidemiologist AnnaLynn Williams, PhD, says the goal now is to pinpoint when this accelerated aging starts so doctors can design early interventions to preserve brain function and quality of life for young cancer survivors. The study notes limitations, including inability to fully adjust for chronic health conditions or education and reliance on a single point‑in‑time measurement, so it cannot yet prove causation, but it strengthens evidence that lifesaving cancer therapy can carry lasting neurological costs.