NCT04200534 2025-08-22Centralized Lung Cancer EARly Detection Among Smokers (CLEAR Study)M.D. Anderson Cancer CenterPhase EARLY_PHASE1 Active not recruiting358 enrolled
NCT03742154 2020-10-28Hollings Cancer Center Varenicline Sampling StudyMedical University of South CarolinaPhase EARLY_PHASE1 Completed99 enrolled 9 charts