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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 117 for neurosurgery

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  • Study status: Open/Status Unknown
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  1. ARTFL LEFFTDS Longitudinal Frontotemporal Lobar Degeneration (ALLFTD)

    Jacksonville, FL, Rochester, MN

  2. Electrophysiological Biomarkers for Parkinson's Disease

    Scottsdale/Phoenix, AZ

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

    Scottsdale/Phoenix, AZ, Rochester, MN

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

    Rochester, MN

  5. Synucleinopathies

    Rochester, MN

  6. Advanced Care Planning in Dementia

    Jacksonville, FL

  7. A Study to Review Magnetic Resonance Imaging in Patients with Epilepsy

    Rochester, MN

  8. A Study of Immune-Mediated Activation of Astrocytes in Healthy Volunteers

    Rochester, MN

  9. A Registry for Children Treated with Proton Radiation Therapy

    Rochester, MN

  10. A Study of Demyelinating Lesions as a Cause of Progressive Motor Deterioration

    Rochester, MN

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