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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 129 for Neurosurgery

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  1. Immune Phenotyping in Amyotrophic Lateral Sclerosis

    Rochester, MN

  2. A Study to Evaluate a Color Test for Patients with Optic Nerve Diseases

    Rochester, MN

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

    Rochester, MN

  4. Long Term Clinical Outcomes of Devic’s Disease

    Rochester, MN, Jacksonville, FL

  5. Resting State Connectivity in Adolescents with Postural Orthostatic Tachycardia Syndrome and Chronic Pain

    Rochester, MN

  6. A Study to Evaluate Sex-Specific Effects of Endocrine Disruption on Aging and Alzheimer's Disease

    Jacksonville, FL, Rochester, MN

  7. A Study to Assess Sinus Stenting to Manage Cerebrospinal Fluid Leak

    Rochester, MN

  8. Electrophysiological Biomarkers for Parkinson's Disease

    Scottsdale/Phoenix, AZ

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

    Scottsdale/Phoenix, AZ, Rochester, MN

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

    Jacksonville, FL, Rochester, MN

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