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NIH Research Project Grant

Assay development and screening for discovery of chemical probes, drugs or immunomodulators

Funds the early end of drug discovery — building the assay, running the screen, and validating the hits into something worth chasing.

Every small-molecule drug starts as a hit in a screen, and every screen starts as an assay somebody had to build. The National Cancer Institute funds that whole opening stretch here, for chemical probes that illuminate the biology of a disease and for compounds that turn a target on or off as a step toward therapy or immunotherapy.

Four stages are in scope, and the notice describes each. Building

Small-molecule discovery research: developing assays for specific biological targets and disease mechanisms, running high-throughput target-focused or moderate-throughput phenotypic and fragment-based screens, validating hits through orthogonal secondary assays and cheminformatics, and — per the notice's own fourth stage — hit-to-lead optimization work including SAR, ADME/PK/PD studies and in vivo efficacy testing.

CycleiHow often this grant runs — e.g. annually, on a rolling basis, or a one-off call.Multiple per year
Next deadlineiThe next date applications are due. Rolling means you can apply any time.7 Sept 2026
Decision timeiTypical time from the deadline to the funder's decision.26 weeks
Project durationiHow long the funded work is expected to run.
Award typeiThe form of funding — grant, equity, loan, tax credit, etc.Grant
Match fundingiThe share of project costs you must cover yourself. 0% = fully funded.
Funding pooliThe total budget available across all awards in this round.

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Last verified: 25 Aug 2026Funder reference: PAR-25-153Source: www.grants.gov