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A volunteer subject with no known significant health problems who participates in research to test a new drug, device or intervention. These volunteers are recruited to serve as controls for patient groups. Healthy volunteers receive the same test, procedure, or drug the patient group receives.

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During the early phases (phases 1 and 2), researchers assess safety, side effects, optimal dosages and risks/benefits. In the later phase (phase 3), researchers study whether the treatment works better than the current standard therapy. They also compare the safety of the new treatment with that of current treatments. Phase 3 trials include large numbers of people to make sure that the result is valid. There are also less common very early (phase 0) and later (phase 4) phases. Phase 0 trials are small trials that help researchers decide if a new agent should be tested in a phase 1 trial. Phase 4 trials look at long-term safety and effectiveness, after a new treatment has been approved and is on the market.

Search Results 101-110 of 124 for neurosurgery

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  1. A Study to Clarify the Relationship Between Autonomic Nervous System Regulation and Cognitive Performance

    Rochester, MN

  2. Long Term Clinical Outcomes of Devic’s Disease

    Rochester, MN, Jacksonville, FL

  3. A study to create and analyze a comprehensive longitudinal resource using testing results from those with genetic risk of Alzheimer's disease

    Scottsdale/Phoenix, AZ

  4. Cerebrospinal Fluid (CSF) Biomarkers for Prediction of Dementia

    Jacksonville, FL, Rochester, MN

  5. A Prospective Registry for Patients with REM Sleep Behavior Disorder and Polysomnographic REM Sleep without Atonia and Controls

    Rochester, MN

  6. Electrophysiological Biomarkers for Parkinson's Disease

    Scottsdale/Phoenix, AZ

  7. ARTFL LEFFTDS Longitudinal Frontotemporal Lobar Degeneration (ALLFTD)

    Jacksonville, FL, Rochester, MN

  8. A Blood Collection Protocol to Study the Immune Responses of Cancer Patients with Malignancies

    Scottsdale/Phoenix, AZ, Rochester, MN

  9. Metastatic Tumor Research and Outcomes Network

    Rochester, MN

  10. A Study to Evaluate Sex Differences in Multiple Sclerosis Spectrum of Demyelinating Disorders

    Rochester, MN

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