Participants will receive 3 courses of treatment (each course will include 1 treatment with carboplatin followed by 2 separate treatment cycles with GM-CSF and rIFN-g) and then be evaluated for tumor response. If the tumor is responding, 3 additional courses will be given. If after 6 courses of treatment, the tumor has completely responded and there is no evidence of the disease, then up to 4 additional courses can be given for completion of therapy. If the tumor is still responding after 6 courses but has not completely gone away, then additional courses can be given as long as the tumor is responding before completion therapy can be considered.