- May have received prior radiation therapy to one or more non-index lesions (prior radiation to an index lesion is allowable only if progression of the irradiated lesion is demonstrated, with progression defined as an increase of 20% or more in the largest diameter) and/or one prior vaccine therapy for metastatic disease. Prior adjuvant therapy with IFN alpha-2b, vaccine, and/or granulocyte-macrophage colony-stimulating factor (GM-CSF) is permitted. At least 4 weks must have elapsed since the completion of any prior therapy.