Free scoping read. A written assessment of your manuscript in two business days, at no cost.

Start one

Funding callMedicine and clinical research · United States

NIH Exploratory/Developmental Research Project Grant (Parent R21, Clinical Trial Not Allowed) PA-25-304 – February 2027 due date

The NIH Exploratory/Developmental Research Project Grant (Parent R21, Clinical Trial Not Allowed), PA-25-304, supports exploratory or developmental research within the mission of participating NIH institutes; this guide focuses on the 16 February 2027 due date. It covers research areas consistent with the scheme, eligibility and readiness checks, what review panels typically value and how to plan an application.

Pubrica InsightsEditorial team, reviewed by a subject specialist
Next deadline
16 February 2027
Last checked
10 November 2026
Funder
National Institutes of Health
Sources
1
Apply through the official call

Key dates

Application deadline
16 February 2027
Details last checked
10 November 2026
Apply through the official call

About the call

Funder
National Institutes of Health
Country
United States
Scheme type
Project grant
Funding
As stated in the call documents
Eligibility
Exploratory or developmental research projects within the mission of participating NIH institutes; applications proposing clinical trials are not accepted.
Scope
Medicine and clinical research

Topics consistent with the call

  • Development of new research methods, assays or technologies
  • Pilot and feasibility studies that establish proof of concept
  • Exploratory mechanistic studies in disease biology
  • Observational studies that generate preliminary data for larger projects
  • Secondary analyses of existing datasets addressing novel questions

Based on the published scope; the official page sets out the full themes and requirements.

Is your work a fit? Check before you apply

  1. Confirm that the project is exploratory or developmental and does not propose a clinical trial.
  2. Check that the topic falls within the mission of a participating NIH institute or centre.
  3. Review institute-specific requirements and budget and duration limits in PA-25-304.
  4. Ensure your institution is registered and ready to submit through the required systems.
  5. Prepare a complete, institutionally approved application before 16 February 2027.

Why This Funding Call Matters

New research directions often need early-stage support before they can compete for larger awards. The parent R21 is designed for exploratory and developmental projects that may involve considerable risk but could lead to a breakthrough or to new methods, models or applications. For investigators, it provides a route to test a novel idea and gather the preliminary data that later applications usually require. Because clinical trials are not allowed under this announcement, it suits laboratory, observational and methodological work.

Who Should Apply

Academic backgrounds

  • Biomedical sciences
  • Epidemiology
  • Bioengineering
  • Behavioural and social sciences
  • Bioinformatics

Institutions and sectors

  • Universities and medical schools
  • Independent research institutes
  • Hospitals and academic medical centres
  • Other organisations eligible under NIH rules

What Reviewers Typically Value

  1. A novel idea with potential to open a new research direction.
  2. A clear rationale for why an exploratory approach is appropriate.
  3. A feasible plan with milestones that can be achieved within the award period.
  4. Strong potential for the results to support future, larger research projects.

Ideas You Could Develop

Novel biomarker assay developmentA project developing and validating a new assay to detect an early molecular marker of disease in stored biospecimens.
Feasibility of remote data collectionAn observational study testing the feasibility and data quality of remote sensor-based monitoring in a defined patient population.
New animal model of diseaseA developmental project establishing and characterising a new animal model for a poorly understood disease mechanism.

Your Plan to the Deadline

A suggested schedule working back from 16 February 2027. Adjust it to the stage your work has reached.

  1. By 22 Dec 2026

    Read the call documents; confirm eligibility, budget limits, assessment criteria and institutional requirements.

  2. By 5 Jan 2027

    Agree the research question, aims, team and partners; contact your research office.

  3. By 19 Jan 2027

    Draft the case for support, methods, impact and budget.

  4. By 2 Feb 2027

    Obtain internal review, letters of support and institutional sign-off.

  5. By 11 Feb 2027

    Final checks against the funder’s guidance and formatting rules.

  6. By 16 Feb 2027

    Submit through the funder’s system before the deadline.

What you gain

  • Funding for the research, team and resources it needs.
  • Recognition from a competitive, peer-reviewed process.
  • Reviewer feedback that strengthens future applications.
  • A track record for larger grants and fellowships.

What happens after you apply

  1. Eligibility check: the funder confirms the application meets the call rules.
  2. Peer review: external reviewers assess the proposal against the published criteria.
  3. Panel: a committee ranks proposals; some schemes include an interview.
  4. Decision: outcomes are released on the funder’s timetable.
  5. Award: successful applicants agree terms and reporting requirements before starting.

What the Funder Are Looking For

The NIH is looking for exploratory or developmental projects within the mission of participating institutes that could establish new research directions, methods or models. Applications that present an innovative idea, a clear rationale and a feasible plan are likely to be competitive, provided they do not propose a clinical trial. Participating institutes, budget limits, eligibility and submission instructions should be confirmed in the PA-25-304 notice of funding opportunity.

Read the official pageThis guide summarises the opportunity. Confirm deadlines, eligibility and requirements on the official page before you plan your work, and record the date you checked it.Open the official page

Expert help

How Pubrica Can Help

Pubrica’s subject specialists can help you prepare a competitive proposal, planned back from the deadline. You remain the author of your work.

Grant writingProposal writing structured to the funder’s guidance and assessment criteria. Literature review and gap analysisThe evidence base and the gap your proposal addresses. Study designStudy design and methods that reviewers can assess. Statistical analysis planSample size and analysis plans for the proposal. Data management planData management and sharing plans to funder requirements. Proposal editingEditing of the full proposal for clarity and consistency.
Go to the official page

FAQs

Questions Researchers Ask

The next published deadline is 16 February 2027. Dates can change, so confirm them on the official page before you plan your work.

Studies with human participants may be possible under this announcement if they do not meet the NIH definition of a clinical trial. Applicants should check the NIH clinical trial definition and the PA-25-304 notice, and consult programme staff at the relevant institute if uncertain.

Exploratory or developmental research projects within the mission of participating NIH institutes; applications proposing clinical trials are not accepted. Confirm the full eligibility rules in the call documents.

Yes. Pubrica’s specialists can review, write, edit and format your proposal. You remain the author and the person responsible for the submission.

Sources

  1. National Institutes of Health. (2026). NIH Exploratory/Developmental Research Project Grant (Parent R21, Clinical Trial Not Allowed) PA-25-304 – February 2027 due date. Retrieved 10 November 2026, from https://grants.nih.gov/grants/guide/pa-files/PA-25-304.html

How to cite this page

Pubrica Insights. (2026). NIH Exploratory/Developmental Research Project Grant (Parent R21, Clinical Trial Not Allowed) PA-25-304 – February 2027 due date. Pubrica. https://pubrica.com/insights/calls-and-conferences/nih-exploratory-developmental-research-project-grant-parent-r21-clinic/

  • NIH
  • R21
  • Exploratory research
  • Pilot studies
  • United States

Other Open Funding Calls

Closes 19 November 2026FAPESP Young Investigator Grant for International ResearchersBrazil Closes 24 November 2026MSCA Doctoral Networks 2026 (HORIZON-MSCA-2026-DN-01)International Closes 30 November 2026First in the World Challenge Grants 2026India

All calls, conferences and fundingGrant writing

NIH Exploratory/Developmental Research Project Grant (Parent R21, Clinical Trial Not Allowed) PA-25-304 – February 2027 due dateNext deadline 16 February 2027

Official page
Get a free quote

Regulations

Check your project against this rule

  1. 1Your work
  2. 2Your details
  3. 3Send
What do you need?

Material you send is held under signed confidentiality, with access limited to the assigned team and encrypted transfer. It is not used to train anything and is not passed to third-party tools. Ask for the agreement before you send anything you would rather cover first.