The Parkinson's Progression Markers Initiative (PPMI)

Principal Investigator

Penelope Hogarth

Study Purpose

The purpose of this research study is to collect clinical information, samples of blood, urine, spinal fluid, and brain images from 1) people with Parkinson Disease (PD), 2) people who may be at risk to develop PD, and 3) from healthy people without PD.

The information collected in this study will be used to help develop biomarkers for PD. Biomarkers are measures that may help us to understand how PD changes over time and may help us test drugs to treat the disease in the future.

Medical Condition(s)

1) Parkinson disease 2) Hyposmia (decreased sense of smell) 3) No neurological disease 4) Have a positive genetic mutation in the LRRK2 or SNCA gene

Eligibility Criteria

This study is currently recruiting 1) healthy volunteers 60 years or older who are willing to be screened for a decreased sense of smell and 2) people who know from prior genetic testing that they carry a "risk" gene for PD called LRRK2. 3) Healthy people with a family history of PD and have an Ashkenasi Jewish heritage 4) Healthy people with a family history of the LRRK2 or SNCA gene mutation. 5) People with Parkinson's disease with an Ashkenazi Jewish heritage.

The study has completed recruitment of people with Parkinson disease.

Age Range

30 - 80

Healthy Volunteers Needed


Duration of Participation

For subjects found to have decreased sense of smell on screening, or have a positive LRRK2 or SNCA mutation and choose to participate in the full study, duration of participation will be approximately 3 years.

Minors Included



Research Coordinator


The Michael J. Fox Foundation for Parkinson's Research

Recruitment End


Compensation Provided



There is no reimbursement for the screening assessment for decreased sense of smell, which is done by mail. Nor is there reimbursement for the genetic testing portion of the study. Subjects subsequently participating in the full study will be paid $50 for completing each of the following visits: the Screening visit, the 3 month, 9 month, 18 month, and 30 month visit. Subject will be paid $200 for completing each of the following visits: the Baseline visit, the 6 month, 12 month, 24 month, and 36 month visit. If the subject chooses to leave the study early, s/he will only be compensated for the visits completed.

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