Purpose: The AHL2011 study (ClinicalTrials.gov identifier: NCT01358747) demonstrated that a positron emission tomography (PET)-driven de-escalation strategy after two cycles of bleomycin, etoposide, doxorubicin, cyclophosphamide, vincristine, procarbazine, and prednisone (BEACOPP) provides similar progression-free survival (PFS) and overall survival (OS) and reduces early toxicity compared with a nonmonitored standard treatment. Here, we report, with a prolonged follow-up, the final study results., Methods: Patients with advanced Hodgkin lymphoma (stage III, IV, or IIB with mediastinum/thorax ratio > 0.33 or extranodal involvement) age 16-60 years were prospectively randomly assigned between 6 × BEACOPP and a PET-driven arm after 2 × BEACOPP delivering 4 × ABVD (doxorubicin, bleomycin, vinblastine, and dacarbazine) in PET2- and 4 × BEACOPP in PET2+ patients. PET performed after four cycles of chemotherapy had to be negative to complete the planned treatment., Results: In total, 823 patients were enrolled including 413 in the standard arm and 410 in the PET-driven arm. With a 67.2-month median follow-up, 5-year PFS (87.5% v 86.7%; hazard ratio [HR] = 1.07; 95% CI, 0.74 to 1.57; P = .67) and OS (97.7% in both arms; HR = 1.012; 95% CI, 0.50 to 2.10; P = .53) were similar in both randomization arms. In the whole cohort, full interim PET assessment predicted patients' 5-year PFS (92.3% in PET2-/PET4-, 75.4% [HR = 3.26; 95% CI, 18.3 to 5.77] in PET2+/PET4- and 46.5% [HR = 12.4; 95% CI, 7.31 to 19.51] in PET4+ patients, respectively; P < .0001) independent of international prognosis score. Five-year OS was also affected by interim PET results, and PET2+/PET4- patients (93.5%; HR = 3.3; 95% CI, 1.07 to 10.1; P = .036) and PET4+ patients (91.9%; HR = 3.756; 95% CI, 1.07 to 13.18; P = .038) had a significant lower OS than PET2-/PET4- patients (98.2%). Twenty-two patients (2.7%) developed a second primary malignancy, 13 (3.2%) and 9 (2.2%) in the standard and experimental arms, respectively., Conclusion: The extended follow-up confirms the continued efficacy and favorable safety of AHL2011 PET-driven strategy, which is noninferior to standard six cycles of BEACOPP. PET4 provides additional prognostic information to PET2 and allows identifying patients with particularly poor prognosis., Competing Interests: René-Olivier CasasnovasHonoraria: Roche/Genentech, Takeda, Gilead Sciences, Bristol Myers Squibb, Merck, AbbVie, Celgene, Janssen, AmgenConsulting or Advisory Role: Roche/Genentech, Takeda, Gilead Sciences, Bristol Myers Squibb, Merck, AbbVie, Celgene, Janssen, IncyteResearch Funding: Roche/Genentech (Inst), Gilead Sciences (Inst), Takeda (Inst)Travel, Accommodations, Expenses: Roche/Genentech, Takeda, Gilead Sciences, Janssen Pauline BriceResearch Funding: Takeda, BMSTravel, Accommodations, Expenses: Roche, Amgen, AbbVie/Genentech Julien LazaroviciTravel, Accommodations, Expenses: Mundipharma Hervé GhesquieresHonoraria: Gilead Sciences, Janssen, Celgene, RocheConsulting or Advisory Role: Gilead Sciences, Celgene, Roche, MundipharmaTravel, Accommodations, Expenses: Roche, Gilead Sciences, Celgene, Takeda Aspasia StamatoullasTravel, Accommodations, Expenses: Pfizer Jehan DupuisConsulting or Advisory Role: AstraZenecaTravel, Accommodations, Expenses: Gilead Sciences Thomas GastinneHonoraria: Pfizer, Takeda, Gilead SciencesConsulting or Advisory Role: Takeda, Gilead SciencesTravel, Accommodations, Expenses: Roche, Pfizer Krimo BouabdallahHonoraria: Roche, Takeda Science Foundation, AbbVie, Kite/GileadConsulting or Advisory Role: Roche, Takeda, Kite/GileadTravel, Accommodations, Expenses: Roche, Takeda Pierre FeugierHonoraria: Roche/Genentech, Janssen, Gilead Sciences, Amgen, AbbVieConsulting or Advisory Role: Roche/Genentech, Janssen, AbbVie, Gilead Sciences, Amgen, AstraZenecaSpeakers' Bureau: Roche/Genentech, AbbVie, Amgen, Janssen, Gilead SciencesResearch Funding: Roche/Genentech, Gilead Sciences, Janssen, AbbVie, AmgenTravel, Accommodations, Expenses: Amgen, Gilead Sciences, Janssen, Roche/Genentech, AbbVie Franck MorschhauserConsulting or Advisory Role: Roche/Genentech, Gilead Sciences, Celgene, Bristol Myers Squibb, AbbVie, Epizyme, ServierSpeakers' Bureau: RocheExpert Testimony: Roche/Genentech David SibonConsulting or Advisory Role: Takeda, Iqone healthcare, Janssen, Roche, AbbVieTravel, Accommodations, Expenses: Takeda, Janssen Christophe BonnetConsulting or Advisory Role: Roche Diane DamotteResearch Funding: AstraZeneca/MedImmune Marc AndréConsulting or Advisory Role: Takeda, BMSiResearch Funding: Takeda (Inst), Roche (Inst)Travel, Accommodations, Expenses: Roche, Celgene, Gilead Sciences Michel MeignanHonoraria: RocheTravel, Accommodations, Expenses: Roche Cédric RossiConsulting or Advisory Role: Janssen, AbbVie, Roche, TakedaResearch Funding: TakedaTravel, Accommodations, Expenses: AbbVieNo other potential conflicts of interest were reported.