Up to 24 patients with stage III or stage IV melanoma will be enrolled. Patients who are currently disease-free but at high risk for relapse are also eligible. Patients will receive vaccinations of gp75 at assigned dose levels. Patients who exhibit serologic and stable/clinical response are eligible to receive booster vaccinations. Patients will be evaluated for safety and efficacy throughout the duration of the study. In this study, the optimal biologically effective dose is defined as the lowest dose of gp75 that results in the production of anti-gp75 antibodies.