They determined which gene causes Alzheimers in humans and have developed a fix for it.
Dementia and Alzheimer's disease aren't the same. Dementia is an overall term used to describe symptoms that impact memory, performance of daily activities, and communication abilities. Alzheimer's disease is the most common type of dementia. Alzheimer's disease gets worse with time and affects memory, language, and thought.
Dementia is a syndrome, not a disease. A syndrome is a group of symptoms that doesn't have a definitive diagnosis. Dementia is a group of symptoms that affects mental cognitive tasks such as memory and reasoning. Dementia is an umbrella term that Alzheimer's disease can fall under. It can occur due to a variety of conditions, the most common of which is Alzheimer's disease.