1.	Phase III Chemotherapy with Busulfan with or without Vitamin A for Chronic Myelogenous Leukemia (Summary Last Modified 07/97) Phase: Phase III Type: Treatment Status: Completed Age: no age specified Sponsor: NCI Protocol IDs: SWOG-7984
2.	Phase III Postoperative Therapy with Vitamin-A vs No Further Treatment for Poor-Prognosis Stage I Melanoma (Summary Last Modified 07/97) Phase: Phase III Type: Treatment Status: Completed Age: no age specified Sponsor: NCI Protocol IDs: SWOG-8049
3.	Phase III Surgery Followed by No Further Therapy vs Vitamin A vs ACT-D/DTIC for Recurrent Malignant Melanoma (Summary last modified 06/97) Phase: Phase III Type: Treatment Status: Completed Age: no age specified Sponsor: NCI Protocol IDs: SWOG-8111
4.	Phase III Randomized Study of Immunotherapy with BCG with vs without Vitamin A for Resected, Poor-Prognosis Malignant Melanoma Phase: Phase III Type: Treatment Status: Closed Age: no age specified Sponsor: Protocol IDs: UARIZ-MEL-1
5.	Phase III Randomized Comparison of the Influence of Chemoprevention with Vitamin A and/or N-Acetylcysteine vs No Treatment on Development and Detection of Second Primary Cancers in Patients Curatively Treated for Laryngeal, Oral Cavity, and Nonsmall Cell Lung Carcinoma Phase: Phase III Type: Prevention Status: Closed Age: 75 and under Sponsor: Protocol IDs: EORTC-08871, EORTC-24871
6.	Study of the Effect of Nutritional Intervention on Esophageal Cancer in Linxian, People's Republic of China (Summary Last Modified 10/88) Phase: Phase III Type: Prevention Status: Completed Age: 40 to 69 Sponsor: Protocol IDs: DCPC-CPSB-11204
7.	Phase III Study of Isotretinoin vs Vitamin A vs Placebo for the Prevention of Skin Cancer in Patients with a History of Basal and Squamous Cell Carcinoma of the Skin (Summary Last Modified 10/89) Phase: Phase III Type: Prevention Status: Closed Age: 21 to less than 85 Sponsor: Protocol IDs: UARIZ-P89-0002, NCI-P89-0002
8.	Phase III Randomized, Double-Blind Study of Multiple Vitamins at the Recommended Daily Allowance (RDA) vs Multiple Vitamins at the RDA plus High-Dose Vitamins A, B6, C, and E in Patients with Transitional Cell Carcinoma of the Bladder (Summary Last Modified 06/91) Phase: Phase III Type: Supportive care Status: Closed Age: any age Sponsor: Protocol IDs: WVU-11715, NCI-V91-0025
9.	Phase III Randomized Chemoprevention Study of Long-Term, Low-Dose Isotretinoin vs Vitamin A in Patients with Premalignant Lesions of the Oral Cavity (Summary Last Modified 06/97) Phase: Phase III Type: Prevention Status: Closed Age: 18 and over Sponsor: Other Protocol IDs: MDA-DM-90096, NCI-V93-0310
10.	Phase I/II Study of Chemopreventive Agents for the Prevention of Skin Cancer (Summary Last Modified 04/1999) Phase: Phase II, Phase I Type: Prevention Status: Completed Age: 50-84 Sponsor: NCI Protocol IDs: MDA-ID-95184, NCI-P97-0099
11.	Phase II Chemotherapy with Nafoxidine vs Hormone Therapy with Tamoxifen for Disseminated Breast Cancer Phase: Phase II Type: Treatment Status: Closed Age: no age specified Sponsor: Protocol IDs: WSU-C-25677
12.	Safety of Antioxidants During GYN Cancer Care Phase: Phase II Type: Treatment Status: Closed Age: No age specified Sponsor: Other Protocol IDs: 10006, NCT00284427
13.	Long-Term Monitoring of Potential Side Effects and Adherence in Subjects at High Risk for Lung Cancer Enrolled in Two Chemoprevention Studies with Beta Carotene and Retinol: Vanguard Study (Summary Last Modified 11/92) Phase: No phase specified Type: Prevention Status: Closed Age: 45 to 74 Sponsor: Protocol IDs: FHCRC-VANGUARD, NCI-P92-0028
14.	Randomized, Placebo-Controlled Beta Carotene and Retinol Efficacy Trial (CARET) for Chemoprevention of Lung Cancer in High-Risk Populations Phase: No phase specified Type: Prevention Status: Closed Age: 45 to 69 Sponsor: Protocol IDs: FHCRC-CARET, NCI-P92-0029