After completion of BEACOPP chemotherapy, patients undergo a third FDG-PET/CT scan to assess response. Patients with a negative FDG-PET/CT scan receive 2 more courses of BEACOPP-14 or 1 more course of BEACOPP-escalated chemotherapy. Patients with a persistently positive FDG-PET/CT scan may receive radiotherapy to sites of FDG uptake or salvage chemotherapy, at the investigator's discretion.