^a)Two patients died.

Abbreviations: LN, lymph node; IPI, International Prognostic Index; LDH, lactate dehydrogenase; CTX, chemotherapy; RT, radiotherapy; PFS, progression-free survival; OS, overall survival; Uni, unilateral; Bi, bilateral; Rt, right; Lt, left; B, both; BM, bone marrow; CNS, central nervous system; R-CHOP, rituximab+cyclophosphamide+doxorubicin+vincristine+prednisolone; CR, complete response; PAL, paraaortic lymph node.