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The highest priority in Hodgkin lymphoma (HL) is to maintain very high cure rates while minimizing early or late treatment–related toxicity and mortality. To investigate a positron-emission tomography (PET)–response–adapted approach to treatment de-escalation, UK investigators conducted a multicenter, noninferiority phase III trial involving 571 evaluable patients with newly diagnosed stage IA or IIA HL.
Following 3 cycles of standard ABVD (doxorubicin, bleomycin, vinblastine, dacarbazine), PET imaging was performed and evaluated by central review. A total of 426 PET-negative patients (74.6%) were randomized to no further therapy versus the administration of involved-field radiotherapy (RT; 30 Gy). PET-positive patients received a fourth cyc…