Mixed Neurodegenerative Disorders Are Emerging From The Shadows

Many cases of age-related neurodegenerative disease fall into the gray zone between big, defined diseases - Alzheimer"s or Parkinson"s, for example. Their diagnostic accuracy is low, researchers agree. That"s a problem, because mixed disease is not only common, but also quite different in its course from pathologically "pure" disease. (Mixed disease is often worse.) But there"s also excitement and opportunity. The large overlap between established neurodegenerative diseases is ripe for scientific exploration, and recent advances at the genetic, clinico-pathologic, and molecular levels have turned it into a dynamic area of research. In particular, diseases such as Dementia with Lewy bodies and frontotemporal dementias are drawing intense interest as biomarker development branches out beyond Amyloid beta and tau, holding out a future where molecular-based diagnoses can define the pathogenic proteins that together drive a given person"s individual disease.