1.	Phase III Randomized Chemoprevention Study of Selenium in Participants With Previously Resected Stage I Non-Small Cell Lung Cancer Phase: Phase III Type: Prevention Status: Active Age: 18 and over Sponsor: NCI Protocol IDs: ECOG-5597, CAN-NCIC-BR16, CALGB-79803, NCCTG-E5597, SWOG-E5597, NCI-P00-0176, NCT00008385, BR16
2.	Phase II Randomized Chemoprevention Study of Iloprost in Patients at High Risk for Lung Cancer Phase: Phase II Type: Prevention Status: Active Age: 18 and over Sponsor: NCI Protocol IDs: UCHSC-01279, NCT00084409
3.	Phase II Randomized Study of Green Tea or Polyphenon E in Preventing Lung Cancer in Former Smokers With Chronic Obstructive Pulmonary Disease Phase: Phase II Type: Biomarker/Laboratory analysis, Prevention Status: Active Age: 40 to 80 Sponsor: NCI Protocol IDs: UARIZ-HSC-0353, U01-CA-101204, NCT00363805
4.	Phase II Randomized Chemoprevention Study of Sulindac in Current or Former Smokers With Bronchial Dysplasia Phase: Phase II Type: Biomarker/Laboratory analysis, Prevention Status: Active Age: 40 to 79 Sponsor: NCI Protocol IDs: MAYO-03-1-02, MAY03-1-02, NCT00368927
5.	Phase II Randomized Study of Enzastaurin Hydrochloride in Preventing Non-Small Cell Lung Cancer in Former Smokers Phase: Phase II Type: Biomarker/Laboratory analysis, Prevention Status: Active Age: 45 and over Sponsor: NCI, Pharmaceutical / Industry Protocol IDs: MCC-14787, H6Q-MC-S009, MCC-104545, LILLY-H6Q-MC-S009A, U01-CA-101222, NCT00387816
6.	A Trial of Placebo Versus Enzastaurin for Lung Cancer Prevention in Former Smokers Phase: Phase II Type: Prevention Status: Active Age: 45 and over Sponsor: Pharmaceutical / Industry Protocol IDs: 10723, H6Q-MC-S009, NCT00414960
7.	Phase II Randomized Study of Polyphenon E, A Defined Green Tea Catechin Extract, in Current or Former Smokers With Bronchial Dysplasia Phase: Phase II Type: Biomarker/Laboratory analysis, Prevention Status: Active Age: 45 to 74 Sponsor: NCI Protocol IDs: BCCA-H07-02401, H07-02401, NCT00611650
8.	Phase II Randomized Study of Inositol for the Prevention of Lung Cancer in Current or Former Smokers With Bronchial Dysplasia Phase: Phase II Type: Biomarker/Laboratory analysis, Prevention Status: Active Age: 45 to 79 Sponsor: NCI Protocol IDs: MAYO-MAY06-8-01, MAY06-8-01, NCT00783705
9.	Randomized Study of Health Education Counseling With Versus Without Bupropion Hydrochloride in African-Americans Who Are Light Smokers Phase: No phase specified Type: Behavioral study, Biomarker/Laboratory analysis, Educational/Counseling/Training, Prevention Status: Active Age: 18 and over Sponsor: NCI Protocol IDs: KUMC-HSC-10332, 10332, KUMC-070313, NCT00666978
10.	Randomized Study of Phenethyl Isothiocyanate as a Modifier of NNK Metabolism in Smokers Phase: No phase specified Type: Biomarker/Laboratory analysis, Prevention Status: Approved-not yet active Age: 21 to 70 Sponsor: NCI Protocol IDs: UMN-2007NT127, PEITC, NCT00691132
11.	Randomized Study of Varenicline Versus Combination Nicotine Replacement Therapy Using Nicotine Patch and Gum in Smokers Participating in a Methadone Maintenance Treatment Program Phase: No phase specified Type: Behavioral study, Prevention Status: Active Age: Over 18 Sponsor: Other Protocol IDs: BUTLER-0807-004, 0807-004, NCT00790569