 Initial cytoreductive chemotherapy comprises of alternating cycles of 3xCHOP and 3x DHAP plus Rituximab. Patients with progressive disease after 2 treatment cycles R-CHOP and 2x R-DHAP will be off study. Patients achieving at least a partial remission after 3x CHOP and 3x DHAP plus Rituximab will proceed to with stem cell collection. The subsequent myeloablative radio-chemotherapy with stem cell transplantation consists of a radiotherapy TBI, high dose Ara-C and Melphalan. 