DISEASE CHARACTERISTICS: Histologically confirmed, pathologically verified, disseminated stage IV melanoma that is surgically incurable Any T, any N, M1a or M1b Must have received at least one prior chemotherapy, biologic/immunotherapy, or combination regimen for metastatic disease At least 4 weeks since prior systemic therapy Bidimensionally measurable disease by physical exam, CT scan, radionuclide scan, or plain x-ray outside previously irradiated area No brain metastases by MRI or CT scan (except completely resected brain tumors that have undergone whole brain radiotherapy)