R-ICE and High-Dose Cyclophosphamide With PET/CT for Diffuse Large B-Cell Non-Hodgkin's Lymphoma

This research is being done to see if a PET scan that is obtained after 3 cycles of a standard chemotherapy regimen can help guide treatment for patients with a blood disease called Non-Hodgkin's Lymphoma. The standard treatment for newly diagnosed lymphoma is 6 to 8 cycles of chemotherapy like the CHOP combination (Cyclophosphamide, Doxorubicin, Vincristine, and Prednisone). This regimen can cure about half of patients with lymphoma, but in many others disease relapses (comes back). Relapses are generally treated with more chemotherapy. We believe that a PET scan (a type of imaging study that "lights up" in areas of cells with high activity such as lymphoma), may identify patients early who are at high risk of relapse. The purpose of this research study is to find out if people whose treatment is changed early to an intensification regimen (high dose chemotherapy) based on a positive PET scan will have longer remissions than they would if they did not receive that high dose chemotherapy.