The National Institutes of Health (NIH) is inviting applications for the "Single-Site Investigator-Initiated Clinical Trials (R61/R33 Clinical Trial Required)" grant, aimed at supporting the development and execution of single-site clinical trials focused on efficacy, comparative effectiveness, and implementation research. Applicants are required to present a comprehensive scientific and operational plan, including project management strategies, subject recruitment and retention plans, and community engagement efforts, all aligned with the mission of the National Heart, Lung, and Blood Institute (NHLBI). This funding opportunity emphasizes the importance of diverse perspectives and strong project management in advancing health research through innovative trial designs. Interested applicants should note that the application deadline is September 11, 2025, and can reach out to NIH Grants Information at grantsinfo@nih.gov for further inquiries.