Researchers find link between cancer, diabetes drugs and reduced risk of Alzheimer's disease

People who have endured chemotherapy for some cancers appear to have a lower incidence of Alzheimer's disease, as do long-term users of a commonly prescribed diabetes drug, metformin,  scientists have found in separate medical investigations. The research revealed a reduced Alzheimer's risk by as much as half for some forms of cancer. For example, there was a 51 percent lowered risk of Alzheimer's for liver cancer survivors; a 44 percent reduced risk for vets treated for pancreatic cancer, and a 25 percent lowered risk for those who had lung cancer.Cancers in which the Alzheimer's risk increased included melanoma, prostate and colorectal malignancies.