Combination chemotherapy is the standard treatment as initial therapy for advanced stage aggressive Non-Hodgkin's lymphoma (NHL). Standard chemotherapy cures less than 40% of patients. When patients relapse, they may be eligible to receive high-dose chemotherapy with autologous stem cell support. Multiple studies have shown the value of high-dose chemotherapy, with increased disease-free survival and overall survival, when compared with second-line conventional chemotherapy. Unfortunately high-dose chemotherapy is curative in less than half the patients who receive it, and other treatment strategies are needed to improve the cure rate.