| Terminated | Topical Aminolevulinic Acid in Patients With Nonmelanoma Skin Cancer NCT00663910 | The Cleveland Clinic | EARLY_Phase 1 |
| Unknown | Photodynamic Therapy Using Aminolevulinic Acid in Treating Patients With Skin Cancer NCT00747903 | Laser and Skin Surgery Center of New York | Phase 2 |
| Terminated | Studying a Tumor Marker for Testicular Cancer, Skin Cancer, Small Intestine Cancer, and Pancreatic Cancer NCT00899132 | Case Comprehensive Cancer Center | — |
| Unknown | Bioelectric Field Imaging in Diagnosing Melanoma and Other Skin Cancers in Patients With Skin Lesions NCT00391300 | Eastern Virginia Medical School | Phase 1 |
| Unknown | Gefitinib and PEG-Interferon Alfa-2a in Treating Patients With Unresectable or Metastatic Skin Cancer NCT00423397 | University of California, San Diego | Phase 1 / Phase 2 |
| Completed | LMB-2 Immunotoxin and Vaccine Therapy in Treating Patients With Metastatic Melanoma That Cannot Be Removed By NCT00295958 | National Institutes of Health Clinical Center (CC) | Phase 2 |
| Completed | Photodynamic Therapy Using Silicon Phthalocyanine 4 in Treating Patients With Actinic Keratosis, Bowen's Disea NCT00103246 | Case Comprehensive Cancer Center | Phase 1 |
| Unknown | Computer-Based Continuing Education for Doctors in Examination and Counseling of Patients on Skin Cancer or We NCT00295906 | Rhode Island Hospital | N/A |
| Completed | Effect of Solar-Simulated Ultraviolet Radiation on Gene Expression in Unprotected and Sunscreen-Protected Skin NCT00099112 | National Cancer Institute (NCI) | — |
| Completed | Imiquimod Cream in Treating Patients With Basal Cell Skin Cancer NCT00079300 | National Naval Medical Center | Phase 1 |
| Completed | Acitretin in Preventing Skin Cancer in Patients at High Risk for Skin Cancer NCT00644384 | Mayo Clinic | N/A |
| Completed | Topical Imiquimod Compared With Surgery in Treating Patients With Basal Cell Skin Cancer NCT00066872 | Queen's Medical Center | Phase 3 |
| Terminated | Photodynamic Therapy in Treating Patients With Skin Cancer or Solid Tumors Metastatic to the Skin NCT00023790 | Case Comprehensive Cancer Center | Phase 1 |
| Completed | Eflornithine With or Without Triamcinolone in Preventing Nonmelanoma Skin Cancer in Patients With Actinic Kera NCT00021294 | University of Arizona | Phase 2 |
| Completed | Celecoxib in Preventing Basal Cell Carcinoma in Patients With Basal Cell Nevus Syndrome NCT00023621 | University of California, San Francisco | Phase 2 |
| Completed | SU5416 in Treating Patients With Advanced or Recurrent Cancer of the Head and Neck NCT00006361 | Memorial Sloan Kettering Cancer Center | Phase 2 |
| Completed | Radiation Therapy in Treating Patients With Head and Neck Cancer NCT00021125 | Medical Research Council | Phase 3 |
| Completed | Acitretin in Preventing Skin Cancers in Patients With Previously Treated Skin Cancers Who Have Undergone Organ NCT00003611 | Alliance for Clinical Trials in Oncology | N/A |
| Completed | Photodynamic Therapy in Treating Patients With Basal Cell Skin Cancer NCT00017485 | Roswell Park Cancer Institute | Phase 1 |
| Terminated | Green Tea Extract in Treating Patients With Actinic Keratosis NCT00005097 | Frank Meyskens | Phase 2 |
| Completed | Photodynamic Therapy in Treating Patients With Skin Cancer NCT00002975 | Roswell Park Cancer Institute | Phase 2 |
| Completed | Photodynamic Therapy in Treating Patients With Skin Cancer NCT00002963 | Roswell Park Cancer Institute | Phase 2 |
| Completed | Isotretinoin Plus Interferon in Treating Patients With Recurrent Cancer NCT00002506 | Hoag Memorial Hospital Presbyterian | Phase 2 |
| Completed | Isotretinoin in Preventing Skin Cancer NCT00025012 | National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS) | N/A |
| Unknown | Low Fat Diet to Prevent Disease Progression in Patients With Skin Cancer NCT00003097 | Baylor College of Medicine | Phase 2 |
| Completed | Eflornithine to Prevent Skin Cancer in Patients With Previously Treated Early Stage Skin Cancer NCT00005884 | University of Wisconsin, Madison | Phase 3 |
| Completed | Topical Sirolimus in Patients With Basal Cell Nevus Syndrome and in Healthy Participants NCT00433485 | Yale University | Phase 1 |
| Withdrawn | Celecoxib in Preventing Skin Cancer NCT00025051 | National Cancer Institute (NCI) | Phase 2 |