Arm 1: R-MegaCHOP14x4 + R-MAD + MAD + BEAM + ASCT; Arm 1BIS: R-CHOP14x4 + R-MAD + MAD + BEAM + ASCT; Arm 2: R-MegaCHOP14x4 + R-MegaCHOP14x2; Arm 2BIS: R-CHOP14x4 + R-CHOP14x4; Which are different in dose dense chemotherapy + Rituximab with or without intensified high dose chemoimmunotherapy and support of peripheral autologous stem cells.