The goal of this clinical research study is to learn if the drug leuprolide will increase the level of immune cells in your body. Researchers will also want to know if this drug given together with melanoma vaccines (gp100 and MAGE-3) can improve the ability of tumor fighting immune cells (T cells) to fight melanoma cells. Primary Objective: 1\. To compare the tumor-specific immune responses to melanoma-specific peptide vaccines, gp100 and MAGE-3 in the presence or absence of a luteinizing hormone-releasing hormone (LHRH) agonist-Leuprolide, in patients with stage IIb and III melanoma, uveal melanoma or stage IV melanoma that the metastatic lesion(s) has been surgically removed. Secondary Objectives: 1. To evaluate the kinetics of enhanced thymic activity measured by TREC analysis and flow cytometric analysis following sex hormone ablation by Leuprolide in melanoma patients. 2. To assess whether there are significant differences in overall quality of life (QOL) between patients receiving Leuprolide to those not receiving leuprolide.

This study uses vaccines named gp100 or MAGE-3 to immunize patients with melanoma. The type of melanoma they will be used for contains a protein that is also found in the vaccines. These vaccines are designed to stimulate immune cells, also called T cells, to recognize and kill melanoma cells. Leuprolide will be studied to determine whether it will (is designed to) improve your response to the vaccine. If you are eligible for this treatment, you will be assigned to one of the two groups that either receive one vaccine or two different vaccines, depending on your tissue type (either gp100 vaccine alone or gp100 and MAGE-3 vaccines). A small amount of the vaccine(s) will be injected under your skin to test your body's immune response to the vaccines. The size of the skin reaction will be measured at 48-72 hours. This skin test will be done before you receive any vaccine, at 6 months, and at 12 months, if possible.The participant and/or participant's family will be given detailed verbal and written instructions on how to measure any reaction to the skin tests. A data sheet and ruler (cm/mm) will be given to the participant. You will then be randomly assigned (as in the toss of a coin) to one of 2 treatment groups. Participants in one group will receive leuprolide with the vaccine(s). Participants in the other group will not receive leuprolide. Which group you are assigned to will depend partially on your age. If you are assigned to receive leuprolide injection, you will also have a bone mineral density test to check on the strength of your bones. Before the treatment starts, you will be asked to answer a questionnaire about your quality of life and sexual functioning. Then at 3 months and 12 months of treatment, you will be asked again to answer the same questionnaire. It should take about 20 minutes each time to finish the questionnaire. The vaccines will be injected in the skin every 3 weeks for a total of 48 weeks. Those patients in Group I will receive 32 injections of peptide, whereas those patients in Group II will receive 64 injections of peptide over a 48 week period. If you are assigned to receive leuprolide, then leuprolide will be injected in the muscle at the beginning of the study and at 12 weeks, for a total of 2 additional injections. Both the vaccine and leuprolide injections will be given each time at the melanoma outpatient clinic at M. D. Anderson. Blood (about 4 teaspoons) will be taken at 6 weeks, 12 weeks, then every 12 weeks up to 48 weeks, or at any time if your tumor starts to grow back. Researchers will use this blood to find out how well your immune cells are working to fight your tumor cells. At around 24 weeks and 48 weeks into treatment, your will have CT scans of the chest, abdomen and pelvis to check on the status of your disease. At around 24 weeks, if you are receiving leuprolide and had an abnormal bone mineral density test before the treatment, you will also have the second bone mineral density test to check on the strength of your bones. You may be taken off study if your disease gets worse or intolerable side effects occur. If you are taken off study, you will be asked to have repeat scans and a physical exam, including blood (about 4 tablespoons) for routine tests. Following the first 48 week treatment period, you will be evaluated every 3 months for one year, every 4 months for one year, every 6 months for one year, and then once a year from then on if clinically feasible. You will have an MRI/CT of the brain, chest, abdomen and pelvis to check on the status of your disease. If your disease gets worse or intolerable side effects occur, you will be taken off study. Blood (about 4 tablespoons) will be drawn for routine lab tests. An additional 4 tablespoons of blood will be drawn at each follow-up visit to determine how long the t-cell counts remain high. This is an investigational study. Gp100 and MAGE-3 vaccines are experimental and authorized for research use only. Leuprolide is approved in treating prostate cancer patients and other gynecological diseases, but is not approved for treatment of melanoma. Up to 100 patients will take part in this study. All will be enrolled at M. D. Anderson.