Patients will undergo screening to see if they are eligible. If eligible, participants will start by receiving 2 cycles of BV-CHEP (cycles 1 and 2). After 2 cycles of BV-CHEP, participants will have a PET/CT scan to assess their disease. If the scan shows the cancer has stayed the same or gotten better, participants may continue taking BV-CHEP for two more cycles (cycle 3 and 4). If, at any time during study treatment, a participant's disease gets worse, the participant will end study treatment and other treatment options will be discussed with you.