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Support for Clinical Trials at NIMH

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In 2014, NIH revised its definition of a clinical trial in NOT-OD-15-015  and in 2015, launched a multi-faceted effort to enhance its stewardship over clinical trials (see NIH webpage on Clinical Trial Requirements for Grants and Contracts ). All applicants conducting research on human subjects are encouraged to carefully review this webpage to better understand the definition of a clinical trial, new requirements for clinical trial research, and NIH strategies for implementation.

Given the current NIH definition of clinical trials, some investigators are discovering that their human subjects research now meets the NIH definition of a clinical trial  and is subject to the NIH clinical trial requirements. This includes ‘Basic Experimental Studies with Humans’ (BESH) which are studies that are defined as both “basic science research” and “NIH-defined Clinical Trials” (see below for more information).

NIH requires that all applications involving one or more independent clinical trials be submitted through a notice of funding opportunity (NOFO or "funding opportunity") specifically designated as ‘Clinical Trial Required,’ ‘Clinical Trial Optional,’ or ‘Basic Experimental Studies with Humans.’

The content below provides an overview of how NIMH approaches its clinical trial portfolio and provides links to relevant NIMH funding opportunities that support clinical trial research. General inquiries regarding NIMH clinical trials and/or the clinical trial funding opportunities may be submitted to NIMHClinicalTrials@mail.nih.gov.

NIH definition of a clinical trial

NIH defines a clinical trial  as “A research study in which one or more human subjects are prospectively assigned to one or more interventions (which may include placebo or other control) to evaluate the effects of those interventions on health-related biomedical or behavioral outcomes.” Go to NIH’s Definition of a Clinical Trial  webpage to learn more and to find out if your study meets the NIH definition of a clinical trial.

NIMH funding opportunities to address the safety, efficacy, and effectiveness of preventive, therapeutic, and services interventions

NIMH solicits clinical trial applications through a series of funding opportunities that cover the intervention development pipeline, from first-in-human, early testing of new interventions, confirmatory efficacy trials, through to effectiveness trials. If the goal of the clinical trial application is to establish the safety, clinical efficacy, effectiveness, clinical management and/or implementation of preventive, therapeutic, or services interventions, the application must be submitted in response to one of the funding opportunities as outlined in the Clinical Trial Pipeline - Phase of Intervention Development below.

Applications that involve clinical trials to establish safety, clinical efficacy, effectiveness, clinical management and/or implementation of interventions should NOT be submitted under the NIH parent funding opportunity for clinical trials and, if done so, will be returned without review.

NIMH requires an experimental therapeutics approach  (see Q3) for the development and testing of therapeutic, preventive, and services interventions, in which the studies evaluate not only the clinical effect of the intervention, but also generate information about the mechanisms underlying a disorder or an intervention response. Studies proposed under these funding opportunities must clearly identify a target or mediator of the intervention being tested. A positive result will require that an intervention improves clinical outcomes and has a demonstrable effect on a target, such as a neural pathway, a key cognitive operation, or an interpersonal or contextual factor that is hypothesized to mediate the intervention’s effect, etc.

The NIMH funding opportunities for therapeutic, preventive, and services interventions support a wide range of intervention modalities: cognitive, behavioral, and other psychosocial approaches; pharmacological; neuromodulatory device-based interventions; multimodal preventive and therapeutic interventions; and services interventions, including system-level interventions. The choice of targets, measures, and clinical endpoints will vary with the intervention modality.

Applicants should carefully read the NOFO to which they are responding and the Clinical trials applicant FAQs for more details on the expectations for specific intervention modalities. Applicants are strongly encouraged to contact a Scientific/Research Contact listed at the end of the relevant funding opportunity to discuss the NOFO and NIMH priorities.

 Clinical Trial Pipeline - Phase of Intervention Development
First in HumanExploratory Experimental TherapeuticsConfirmatory EfficacyEffectiveness/Implementation (Prevention, Treatment, Services Interventions)
First in Human and Early Stage Clinical Trials of Novel Investigational Drugs or Device-Based Interventions for Psychiatric Disorders (U01 - Clinical Trial Required ) Pilot Hybrid Effectiveness-Implementation Trials for Mental health Interventions (R01 – Clinical Trial Required) 
 Early Stage Testing of Pharmacologic or Neuromodulatory Device-based Interventions for the Treatment of Mental Disorders (R33- Clinical Trial Required ) (R61/R33-Clinical Trial Required )Full-Scale Hybrid Effectiveness-Implementation Trials for Mental Health Interventions (R01 – Clinical Trial Required )
Development of Psychosocial Therapeutic and Preventive Interventions for Mental Disorders (R61/R33- Clinical Trial Required ) and (R33 Clinical Trial Required) Confirmatory Efficacy Clinical Trials of Non-Pharmacological and Pharmacological Interventions for Mental Disorders (R01 Clinical Trial Required) Effectiveness Trials to Test Mental Health System Interventions (R61/R33 Clinical Trial Required )

NEW and updated NOFOs for effectiveness trials

NIMH uses an updated set of NOFOs for pilot- and full-scale- hybrid effectiveness/implementation trials testing individual-level interventions, and a new R61/R33 phased mechanism NOFO for effectiveness trials to test mental health system interventions. Parameters of these NOFOs are outlined in the table, “Which NOFO is relevant for your effectiveness trial?

Applicants are encouraged to review the NOFOs and email a brief description of potential projects to the Scientific/Research Contacts listed at the end of each funding opportunity to discuss the alignment between the proposed research and the goals of the NOFO.

 Which NOFO is relevant for your effectiveness trial?
 Pilot Hybrid Effectiveness-Implementation Trials for Mental Health Interventions (R01 Clinical Trial Required) *UPDATED*Full-Scale Hybrid Effectiveness-Implementation Trials for Mental Health Interventions (R01 Clinical Trial Required)Effectiveness Trials to Test Mental Health System Interventions (R61/R33 Clinical Trial Required) *NEW*
Nature of the Intervention
  • Preventive and Therapeutic interventions across intervention modalities (e.g., behavioral/psychotherapeutic, pharmacological, somatic, digital, device-based, and combined interventions).
  • Other interventions that target the behavior of individuals, for example:
    • interventions to promote service-users’ help-seeking or engagement in services.
    • strategies that promote adherence to preventive or therapeutic interventions.
    • implementation strategies or other interventions that target provider behavior (e.g., provider training, supervision, or other implementation strategies to promote adoption and sustained use of research informed strategies).
  • Interventions that target system(s) of care, rather than individuals (e.g., individual service users, family members, or providers).
  • Interventions where the focus may be across multiple organizational settings or systems (e.g., primary and specialty care, community clinics, schools, juvenile justice) or at multiple levels within a single organization or system (e.g., patient-, provider-, clinic-, and health system-levels).
  • Interventions where independent variable(s) include the manipulation of structural, organizational, procedural, and interpersonal factors and/or incorporate multiple implementation strategies to improve the delivery, effectiveness, and efficiency of mental health services within or across systems.
Stage of intervention development and testingPilot TrialsTrials that are designed and powered to definitively test effectiveness.
  • Milestone-driven feasibility and infrastructure development (R61).
  • Trials that are designed and powered to definitively test effectiveness (R33).
Prerequisite data and informationEvidence supporting feasibility of conducting the pilot trial in the proposed setting (e.g., practice partners’ support; feasibility of enrolling trial participants).
  • Evidence supporting feasibility of conducting the trial in the proposed setting(s) (e.g., practice partners’ support; feasibility of enrolling trial participants).
  • Pilot data regarding intervention targets/mechanisms and effectiveness.
  • Evidence supported hypotheses.

R61 Phase

  • Evidence supporting feasibility of conducting preliminary work (including a pilot trial, if appropriate) in the proposed setting(s) (e.g., practice partners’ support; feasibility of enrolling trial sites and participants)

R33 Phase: Successful completion of R61 milestones, including:

  • Evidence supporting feasibility of conducting the trial in the proposed settings(s) (e.g., practice partners’ support; feasibility of enrolling trial sites and participants).
  • Pilot data regarding intervention effectiveness.
  • Evidence-supported hypotheses.
Goals of the trial
  • Feasibility/acceptability
  • Preliminary evaluation of the intervention’s impact on outcomes and at least one hypothesized mechanism of action.
  • Data needed in support of a future well-powered clinical trial.
  • Definitive test of effectiveness for primary outcomes (e.g., symptoms, functional outcomes, or risk factors associated with a mental disorder.
  • Examine at least one hypothesized mechanism of action.
  • Examine implementation factors or strategies that impact intervention access, delivery, and sustainability.

R61 Phase

  • Demonstrate feasibility/acceptability in support of the R33 clinical trial (e.g., build infrastructure, secure key partnerships, establish enrollment rate).
  • If applicable, preliminary evaluation of the intervention’s impact on outcomes.

R33 Phase

  • Definitive test of effectiveness for primary outcomes (e.g., mental health service organization and delivery, access, equity, quality, and/or clinical, functional, or population outcomes).
  • Examine how, why, for whom, and/or in which settings or under what circumstances the system intervention may be effective.
Project PeriodNot to exceed 3 yearsNot to exceed 5 years

Not to exceed 5 years

  • R61: 1-2 years
  • R33: 3-4 years

Limited NIMH participation on parent research grant NOFOs

NIMH uses the NIH Parent R01 Clinical Trial Required , the NIH Parent R21 Clinical Trial Required , the NIH Parent R01 Basic Experimental Studies with Humans , and the NIH Parent R21 Basic Experimental Studies with Humans  to accept only “mechanistic” clinical trial applications (see below for descriptors of “mechanistic” clinical trials).

The Basic Experimental Studies with Humans  (BESH) funding opportunities are parent notices for studies that fall within the NIH definition of a clinical trial  and also meet the definition of basic research, as described in NIH Guide Notice NOT-OD-19-024  and NOT-OD-24-118 . Applicants proposing BESH are required to complete the full Human Subjects and Clinical Trial Information in the application form and to register and report results.

NIMH support of mechanistic clinical trials

NIH defines a mechanistic clinical trial as a study “designed to understand a biological or behavioral process, the pathophysiology of a disease, or the mechanism of action of an intervention.” NIMH supports mechanistic clinical trials that focus on biomarker studies that may provide information about physiological function, target engagement of therapeutics, and/or the impact of therapeutic responses. These types of studies do not have as a primary aim to establish the efficacy or effectiveness of the intervention.

NIMH considers two major categories of mechanistic trials (though there may be others):

  1. Mechanistic clinical trials using an intervention of known efficacy: These clinical trials utilize an efficacious intervention to investigate the pathophysiology, and/or psychopathology of mental disorders or the mechanisms of therapeutic responses; and to advance biomarkers of basic neurobiological processes. In such studies: (1) the primary aims do not involve establishing efficacy/effectiveness, and (2) the intervention chosen has already been demonstrated to have efficacy. These trials must be submitted under the NIH Parent R01 Clinical Trial Required  or the NIH Parent R21 Clinical Trial Required .
  2. Mechanistic clinical trials utilizing an experimental manipulation: These studies utilize experimental manipulation and are primarily focused on understanding brain function in healthy individuals or those with disorders by measuring responses to the experimental manipulation. Most of these mechanistic studies are expected to be responsive to the BESH funding opportunities (described above) since they are not intended to inform on the improvement of the health status of the individual or a group of individuals either by better understanding the mechanism of action of an intervention or a measurable improvement in health.

See the Consolidated Notice on NIMH Clinical Trials Policies (NOT-MH-23-375 ), for a summary of NIMH’s polices on support for mechanistic and other clinical trials.

Selected other clinical trial funding opportunities

NIMH also participates on selected funding opportunities that seek or allow clinical trial applications, some of which include other grant mechanisms than noted above. Applications submitted to NIMH via these funding opportunities are expected to comport with NIMH’s experimental therapeutics approach.

These funding opportunities include:

A current listing of these funding opportunities can be found on the NIMH Funding Opportunities & Announcements webpage.

Additional resources for applicants

Selected publications

Published guide notices

Additional resources

Clinical trials applicant FAQs

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