Mechanistic Ancillary Studies to Ongoing Clinical Projects (R21 Clinical Trial Not Allowed) | PAR 21 054

Opportunity Information: Apply for PAR 21 054

The National Institutes of Health (NIH) funding opportunity titled "Mechanistic Ancillary Studies to Ongoing Clinical Projects (R21 Clinical Trial Not Allowed)" (Funding Opportunity Number PAR-21-054) supports short, focused research projects that add a mechanistic component to clinical studies that are already underway. In practical terms, this program is meant for investigators who have access to an existing clinical project, cohort, or study infrastructure and want to leverage that resource to answer deeper "how" and "why" biological, behavioral, or physiological questions related to the parent clinical work. The key idea is that the proposed ancillary study should be mechanistic in nature and should be clearly tied to, and dependent on, the ongoing clinical project rather than standing alone as a separate new clinical endeavor.

This opportunity uses the NIH R21 mechanism, which is designed for exploratory and developmental research. R21 awards are typically used to support early-stage or high-impact ideas that may need preliminary testing, proof-of-concept work, or specialized assays to establish feasibility and generate data that can justify a larger follow-on grant. Here, the R21 is specifically aimed at ancillary mechanistic studies, meaning the project should take advantage of existing participants, samples, data streams, or follow-up already being collected by a parent study. The grant is categorized under Health and is associated with CFDA number 93.846.

A central restriction is embedded directly in the title: "Clinical Trial Not Allowed." That means applicants cannot propose a study that meets NIH's definition of a clinical trial, such as prospectively assigning participants to an intervention to evaluate effects on health-related outcomes. Instead, the ancillary work should generally involve mechanistic measurements, analyses, or observational approaches that complement the parent clinical project without introducing a new interventional clinical trial component. Examples in this general category often include laboratory analyses of biospecimens collected in the parent study, additional mechanistic biomarker testing, imaging or physiological assessments that do not constitute a trial, or analytic work that uses existing clinical data to test mechanistic hypotheses, as long as the work stays within the non-trial boundaries laid out by NIH.

The award ceiling listed for this opportunity is $250,000, reflecting the smaller-scale, targeted nature of an R21 ancillary study. The intent is to fund a discrete set of mechanistic aims that can be accomplished without the budget and scope of a full-scale research project grant. The original closing date shown in the source data is 2022-11-21, and the opportunity was created on 2020-10-22, indicating the announcement was active in that period and may have had multiple receipt dates or cycles depending on NIH policy at the time.

Eligibility is broad and includes many types of U.S.-based organizations and government entities. Eligible applicants include state, county, city or township governments, special district governments, and independent school districts, as well as public and state-controlled institutions of higher education and private institutions of higher education. Native American tribal governments that are federally recognized are eligible, along with public housing authorities and Indian housing authorities. Nonprofits are eligible whether or not they have 501(c)(3) status (as long as they are not institutions of higher education in the nonprofit category specified), and both for-profit organizations (other than small businesses) and small businesses are listed as eligible. The announcement also explicitly notes additional eligible applicants such as Alaska Native and Native Hawaiian Serving Institutions, Asian American Native American Pacific Islander Serving Institutions (AANAPISIs), Hispanic-serving Institutions, Historically Black Colleges and Universities (HBCUs), Tribally Controlled Colleges and Universities (TCCUs), faith-based or community-based organizations, regional organizations, eligible federal government agencies, and Indian/Native American tribal governments other than federally recognized tribes. U.S. territories or possessions are also included as eligible.

At the same time, there are important limits related to foreign involvement. Non-domestic (non-U.S.) entities, including foreign organizations and foreign institutions, are not eligible to apply as the applicant organization. In addition, non-domestic components of U.S. organizations are not eligible to apply. However, "foreign components" are allowed as defined in the NIH Grants Policy Statement, meaning a U.S. applicant may include certain types of foreign collaborations or activities if they meet NIH's definition and are appropriately justified and documented, even though the primary applicant must remain a domestic entity.

Overall, PAR-21-054 is best understood as a mechanism for adding mechanistic depth to existing clinical research by funding a limited, hypothesis-driven set of ancillary analyses or measurements that can capitalize on a parent study's participants, data, or specimen resources, while staying clearly outside the scope of proposing a new clinical trial.

• The National Institutes of Health in the health sector is offering a public funding opportunity titled "Mechanistic Ancillary Studies to Ongoing Clinical Projects (R21 Clinical Trial Not Allowed)" and is now available to receive applicants.
• Interested and eligible applicants and submit their applications by referencing the CFDA number(s): 93.846.
• This funding opportunity was created on 2020-10-22.
• Applicants must submit their applications by 2022-11-21. (Agency may still review applications by suitable applicants for the remaining/unused allocated funding in 2026.)
• Each selected applicant is eligible to receive up to $250,000.00 in funding.
• Eligible applicants include: State governments, County governments, City or township governments, Special district governments, Independent school districts, Public and State controlled institutions of higher education, Native American tribal governments (Federally recognized), Public housing authorities/Indian housing authorities, Native American tribal organizations (other than Federally recognized tribal governments), Nonprofits having a 501 (c) (3) status with the IRS, other than institutions of higher education, Nonprofits that do not have a 501 (c) (3) status with the IRS, other than institutions of higher education, Private institutions of higher education, For-profit organizations other than small businesses, Small businesses, Others.

Apply for PAR 21 054

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