Completion therapy will include carboplatin given every 28 days by vein along with injections of GM-CSF under the skin before and after the chemotherapy. Injections of rIFN-g will be given directly into the abdomen through an abdominal catheter if possible. If this is not possible, then the rIFN-g will be given as injections under the skin. Participants may choose not to receive the rIFN-g through a catheter during the completion phase and can continue to receive it under the skin with the chemotherapy. A maximum of 4 additional courses can be given during this phase of the study.