GM-CSF and rIFN-g are being used to try to stimulate the immune system in the belief that this adds to the effectiveness of the chemotherapy on the tumor. During each course of chemotherapy treatment, blood samples will be taken in order to evaluate the blood count response to GM-CSF. Participants will need to remain in the Houston area beginning with the first injection of GM-CSF and for up to 9 days following the carboplatin infusion for the first course.