This series consists of records reflecting Varmus' role as a Primary Investigator on various grant-funded projects and his numerous roles in variety of research agencies. The materials include grant proposals and correspondence, reviewer comments, and progress reports for grant-funded projects with Harold Varmus as Principal Investigator unless noted. This series is further organized into 3 subseries: 2.1 Grant Records, 2.2 Grant Review Activities, and 2.3 National Institutes of Health.