Overview
- The Boston University CTE Center analyzed 614 brain donors with repetitive head impact exposure, isolating 366 with CTE alone and comparing them with 248 without CTE after excluding other progressive brain diseases.
- Stage IV CTE was associated with roughly quadrupled odds of a clinical dementia diagnosis (OR 4.48), stage III with about doubled odds, and stages I–II showed no association with dementia or cognition.
- The authors argue CTE should be recognized as an Alzheimer’s-disease-related dementia, noting the findings provide the strongest evidence to date of stage-dependent clinical impact.
- Dementia due to CTE was frequently misdiagnosed in life: 40% were labeled as Alzheimer’s disease without autopsy evidence, and another 38% were recorded as unknown or unspecified causes.
- Because CTE can currently be confirmed only at autopsy, researchers call for in‑life biomarkers and prospective, age‑matched studies, while acknowledging limitations including age effects, hippocampal TDP‑43 inclusions, and selection of donors with repetitive head impacts.