ASCT indicates autologous stem cell transplant; pts, patients; IPI, International Prognostic Index; aaIPI, age adjusted International Prognostic Index; NR, not reported; CHOP, cyclophosphamide, doxorubicin, vincristine, prednisone; CHOEP, CHOP + etoposide; APO, doxorubicin, vincristine, prednisone; DHAP, cisplatin, cytarabine, dexamethasone; MACOP-B, methotrexate, doxorubicin, cyclophosphamide, vincristine, prednisone, bleomycin; ESHAP, etoposide, methylprednisolone, cytarabine, cisplatin; and IFE, ifosfamide, etoposide.