Bruce Willis has been living with frontotemporal dementia (FTD) since 2023. While most dementia is not inherited, some rarer forms can have a stronger genetic link, according to the Alzheimer’s Society.To gauge her risk of the neurological disease, which can affect behavior, communication, speech, as well as mobility, Bruce Willis's eldest daughter with Demi Moore opened up about undergoing genetic testing.Rumer, the 38-year-old actress, told People that she underwent the APOE genetic test to understand her risk of developing dementia and learn about other health conditions she may be predisposed to, including Alzheimer’s disease and breast cancer.“It’s terrifying to get answers sometimes,” she said, noting that there are genetic conditions in her family, including dementia and breast cancer.However, she also believes that having information about her health risks can help her take proactive steps.“I think when you have information, it’s power,” Rumer said.Bruce Willis is continuing into his third year living with FTD. The degenerative condition often begins with language difficulties and eventually affects decision-making, emotional regulation, and behavior. His now wife Emma, is his primary caregiver.Why Did Rumer Undergo Genetic Testing?Also read: Bruce Willis Has Become More ‘Tender’ Amid Dementia Battle, Says DaughterRumer said knowing about potential health risks can help her take steps to improve her health, including working on inflammation and heart health.She said being proactive about her brain health, gut health and reproductive health had been a priority even before her father’s diagnosis.“I think health is one of those things that we take for granted until we don’t have it,” she said.She said her efforts include taking supplements, no longer wearing perfumes, and cooking at home instead of worrying about microplastics from takeout containers.Rumer said these steps are important not only for herself but also for her daughter and her ability to be around for her for as long as possible, the report said.What Is An APOE Gene Test?Cleveland Clinic defines an APOE gene test as a type of genetic test that identifies which variant of the apolipoprotein E (APOE) gene a person has.Certain APOE variants are known to be associated with an increased risk of developing Alzheimer’s disease.However, having an increased genetic risk does not mean a person will definitely develop the condition. Risk depends on multiple factors, with genetics being only one of them.What Is The APOE Gene? The APOE gene provides cells with instructions to make apolipoprotein E, a protein that combines with fats to form lipoprotein molecules. These molecules transport cholesterol and other fats through the bloodstream.There are three main APOE alleles:APOE-ε2 (APOE2)APOE-ε3 (APOE3)APOE-ε4 (APOE4)Everyone inherits one copy of the APOE gene from each biological parent.The combination of alleles can influence the risk of certain health conditions by affecting how the body transports cholesterol and other fats through the bloodstream.Which APOE Variant Is Linked To Alzheimer’s Risk?No gene has been found to directly cause Alzheimer’s disease. However, having at least one copy of the APOE-ε4 variant is associated with an increased risk of developing Alzheimer’s disease, Cleveland Clinic said.Where Can APOE Testing Be Done?Major pathology networks and specialized genomic laboratories offer medical-grade APOE genotyping using blood or saliva samples. There are also home saliva testing kits available.