Evaluation of the Impact of Adjuvants Accompanying Peptide Immunization in High-Risk Melanoma

Study Summary

This study will evaluate the immunization effects of a vaccine for patients who are at risk for recurrence of their skin cancer. That is, the risk of cancer is higher if melanoma has invaded deep into the skin or lymph nodes. Currently, the only therapy that the U.S. Food and Drug Administration (FDA) has approved for preventing recurrence of melanoma is alpha-interferon. But the research data are controversial. In this study, the vaccine to be used, called gp100, contains a piece of a protein called a peptide, which melanoma cancer cells produce. Patients 16 and older who have had confirmed melanoma surgically removed and whose tissue type is tested as being human leukocyte antigen serotype within HLA-A serotype group (HLA-A2), through a specific blood test, may be eligible for this study. Up to 132 participants will be enrolled. There will be a physical examination and collection of blood samples for tests, and making sure that x-rays and scans are current. Patients will be randomly assigned to four groups. Group 1 will receive the peptide with an adjuvant (assistant) oil-based liquid called Montanide ISA-51, as an injection in the thigh. Group 2 will receive gp100, Montanide, and a cream called imiquimod, which the FDA has approved for treating genital warts and herpes but that may help immune cells in the skin to recognize the vaccine. Imiquimod will be applied to the skin for 5 days. Group 3 will receive gp100 mixed in salt water given as several mini-doses under the skin of the thigh. Group 4 will also receive several mini-doses of gp100 mixed in saline, as well as imiquimod cream applied to the skin for 5 days. All patients will receive the gp100 every 3 weeks for 12 weeks. Every dose is a cycle, with four cycles considered a course of therapy. If the melanoma does not return or patients do not experience side effects from this therapy, then the courses of vaccine will repeated for up to 12 cycles of therapy (3 courses over 33 weeks). Side effects of the pe

Primary Outcome

Comparison of six different preparations of the gp100:209-217 (210M) melanoma antigen peptide. The arm with the greater number of immunologic responses will be the one most likely to be selected for future study on the basis of immunization alone. Evidence of immunization consist of at least 10 Elispots/100,000 cells above background. An injection site reaction is not an immune response.

Interventions

• DRUG Imiquimod
• DRUG gp100:209-217 (210M)
• DRUG Montanide ISA-51