Hodgkin's lymphoma (HL) accounts for approximately 30% of all malignant lymphomas in Europe and the United States. 1 In Japan, HL accounts for approximately 5-10% of all malignant lymphoma cases. 2 Chemotherapy with ABVD (ADR: doxorubicin, BLM: bleomycin, VBL: vinblastine, DTIC: dacarbazine) or BV (brentuximab vedotin)-AVD (DXR, VBL, DTIC) has been the standard of care for the first-line treatment of classical HL, along with radiation ther-