At the end of cycle 6 of BV-CHEP, participants will have another PET/CT scan. If the scan shows the cancer has gotten better and the participant is eligible for a bone marrow transplant, he/she will have the transplant. If a participant is not eligible for a bone marrow transplant and his/her cancer cells did not test positive for CD30, the participant will end study treatment. The study doctor will discuss other treatment options that are not part of this study with the participant.