Table 1.

Summary of patients.

^a)Age at diagnosis. ^b)International prognostic index: Age, Performance, Extranodal involvement, Ann Arbor stage, serum LDH (Lactate dehydrogenase). Low: 0 or 1 risk factors, Low-Intermediate: 2 risk factors. ^c)NK-Prognostic index [4]: Presence of "B" symptoms, Ann Arbor stage ≥III, serum LDH >1×upper normal limit, and regional lymph node (N1-3, not M1). Group 1: none; Group 2: 1 risk factors; Group 3: 2 risk factors; Group 4: 3 or 4 risk factors. ^d)Time interval between the initial complete remission and the initial relapse.

Abbreviations: No, number; ECOG, Eastern Cooperative Oncology Group; PS, performance status; Sx, symptoms; LN, lymph node.