Proteomics Study of Mild Cognitive Impairment and Alzheimer's Disease

This study is analyzing proteins in the blood and spinal fluid of people with mild cognitive impairment or Alzheimer's disease to find new biological markers that could help diagnose the disease earlier and track its progression. **You may be eligible if...** - You are 55 or older - You have been diagnosed with mild cognitive impairment or Alzheimer's disease, OR a close family member has been diagnosed with Alzheimer's - You have completed a standard self-rating memory questionnaire - You are willing to participate and provide samples **You may NOT be eligible if...** - You have other neurological conditions that could explain your symptoms - You are unwilling to undergo the required sample collections Talk to your doctor to see if this trial is right for you.