For years, doctors have known about a curious aspect: people who survive cancers are significantly less likely to develop Alzheimer's https://www.cell.com/cell/abstract/S0092-8674(25)01433-3 Cancer tumors may protect against Alzheimer's by cleaning out protein clumps https://medicalxpress.com/news/2026-01-cancer-tumors-alzheimer-protein-clumps.html