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Competing Interests: Nadine Kutsch: Honoraria: AbbVie, AstraZeneca, BMS, Kite/Gilead; Research support: AstraZeneca, Gilead. travel grants: AbbVie, AstraZeneca, Beigene, Celgene, Janssen. Sandra Robrecht: Honoraria: AstraZeneca. Anna Fink: Research funding: AstraZeneca and Celgene, Travel grants: AbbVie. Elisabeth Lange: no COIs. Rudolf Weide: Personal fees from AstraZeneca, BeiGene, Biotest, CSL Behring, Daiichi Sankyo, Eisai, Gilead, Hexal, Incyte, Medac, Menarini‐Stemline, Pierre Fabre, Roche, SeaGen, Sobi, and Takeda. Our institution has received research funding from Amgen, Biotest, Celgene, CSL Behring, Daiichi Sankyo, Eisai, GSK, Hexal, Lilly, Medac, Mundipharma, Octapharma, Sobi, and Takeda. Michael G. Kiehl: no COIs. Martin Sökler: no COIs. Rudolf Schlag: no COIs. Ursula Vehling‐Kaiser: no COIs. Georg Köchling: no COIs. Christoph Plöger: no COIs. Michael Gregor: no COIs. Torben Plesner: advisory board: Celgene/BMS. Michael R. Clausen: no COIs. Ilske Oschlies: no COIs. Matthias Ritgen: grants from F. Hoffman‐La Roche; and personal fees from F. Hoffmann‐La Roche and AbbVie. Marco Herling: no COIs. Kirsten Fischer: Advisory Board: AbbVie, Roche, AstaZeneca, Honoraria: Roche, AstraZeneca, Travel Support: Roche. Hartmut Döhner: Advisory role with honoraria for AbbVie, AstraZeneca, Gilead, Janssen, Jazz, Pfizer, Servier, Stemline, Syndax; clinical research funding (to institution) from AbbVie, Astellas, Bristol Myers Squibb, Celgene, Jazz Pharmaceuticals, Kronos Bio, Servier. Clemens‐Martin Wendtner: Research grants, advisory boards and travel grants by Hoffmann‐La Roche, Janssen‐Cilag, AstraZeneca, AbbVie, BeiGene and GSK. Karl‐Anton Kreuzer: consultant or advisory board member, honoraria and research support by AbbVie, Amgen, F. Hoffmann‐LaRoche, Gilead, Janssen‐Cilag and Mundipharma. Stephan Stilgenbauer: Advisory board, honoraria, research support, travel support, speaker fees, trial participation: AbbVie, Amgen, AstraZeneca, BeiGene, BMS, Celgene, Gilead, GSK, Hoffmann‐La Roche, Janssen, Lilly, Novartis, Sunesis. Michael Hallek: Consultant or advisory board member, honoraria, and research support by AbbVie, Amgen, Celgene, F. Hoffmann‐LaRoche, Gilead, Janssen‐Cilag and Mundipharma. Sebastian Böttcher: research funding from Janssen and AbbVie; and honoraria from Roche, Janssen, AbbVie, Novartis, Becton Dickinson, AstraZeneca, and Sanofi. Wolfram Klapper: Research grants from Roche, Amgen, Janssen, InCyte Regeneraon, Takeda and advisory role (Roche) paid to my institution. All without relevance for the current manuscript. Barbara Eichhorst: Consultant or advisory board member, research support or travel support by AbbVie, AstraZeneca, Celgene, F. Hoffmann‐LaRoche, Gilead, Janssen‐Cilag.

UNFOLDER (Unfavorable Young Low-Risk Densification of R-Chemo Regimens) is an international phase-3 trial in patients 18-60 years with aggressive B-cell lymphoma and intermediate prognosis defined by age-adjusted International Prognostic Index (aaIPI) of 0 and bulky disease (≥7.5 cm) or aaIPI of 1. In a 2 × 2 factorial design patients were randomized to 6× R-CHOP-14 or 6× R-CHOP-21 (rituximab, cyclophosphamide, doxorubicin, vincristine, and prediso[lo]ne) and to consolidation radiotherapy to extralymphatic and bulky disease or observation. Response was assessed according to the standardized response criteria published in 1999, not including F-18 fluordesoxyglucose positron emission tomography/computed tomography (FDG-PET). Primary endpoint was event-free survival (EFS). A total of 695 of 700 patients were eligible for the intention-to-treat analysis. Totally 467 patients qualified for radiotherapy of whom 305 patients were randomized to receive radiotherapy (R-CHOP-21: 155; R-CHOP-14: 150) and 162 to observation (R-CHOP-21: 81, R-CHOP-14: 81). Two hundred twenty-eight patients not qualifying for radiotherapy were randomized for R-CHOP-14 versus R-CHOP-21. After a median observation of 66 months 3-year EFS was superior in the radiotherapy-arm versus observation-arm (84% versus 68%; P = 0.0012), due to a lower rate of partial responses (PR) (2% versus 11%). PR often triggered additional treatment, mostly radiotherapy. No significant difference was observed in progression-free survival (PFS) (89% versus 81%; P = 0.22) and overall survival (OS) (93% versus 93%; P = 0.51). Comparing R-CHOP-14 and R-CHOP-21 EFS, PFS and OS were not different. Patients randomized to radiotherapy had a superior EFS, largely due to a lower PR rate requiring less additional treatment (NCT00278408, EUDRACT 2005-005218-19)., Competing Interests: L. Thurner has received travel grants from Abbvie, Janssen and EUSA-Pharm, and has indicated consultancy for Takeda, Astra-Zeneca, Merck, EUSA-pharm. DK-M has received personal fees from Novartis, Astra-Zeneca, Gilead Sciences, GlaxoSmithKline, Janssen-Cilag, and nonfinancial support from Gilead Sciences, Janssen-Cilag, Takeda, Novartis. AV has received honoraria from Roche, Amgen, Kite, Gilead, Novartis, Bristol-Myers Squibb and has indicated a membership of the advisory board of Roche, Amgen, Kite, Gilead, Novartis, Bristol-Myers Squibb. UBK has received honoraria and advisory fees from Roche, Janssen-Cilag, Takeda, Bristol-Myers Squibb, Gilead, Hexal, Pfizer, Astra- Zeneca, Pentixapharm, Amgen, Novartis, MSD and has received clinical study support for Celgene, Takeda, BMS, Roche, Astra-Zeneca, Novartis, MSD, Janssen-Cilag, Pfizer. MN has received travel grants from Roche, Celgene and MSD and personal fees from Roche, Celgene, MSD, Janssen, Amgen, Incyte and Abbvie. FG participates in advisory board of Roche, Boehringer Ingelheim, Abbvie, Merck, Takeda, MSD, Sanofi, Pfizer, Novartis, Amgen and Janssen. RT has received grants from Atara and Roche and travel support from Roche, Atara, Celgene, Janssen and Abbvie; he has indicated a membership of the advisory board of Atara and Abbvie and has indicated consultancy for s Atara. PdNB has indicated consultancy for Roche, Incyte and Novartis. FM has received travel grants from Roche, Takeda, Janssen and Gilead and has indicated consultancy and advisory role for Roche, Gilead, Janssen, MSD, Takeda and Novartis. SS has received grants from Abbvie, Astra-Zeneca, Celgene, Gilead, Roche, Janssen, Novartis, Morphosys and has indicated consultancy for for Abbvie, Astra-Zeneca, Celgene, Gilead, Roche, Janssen, Novartis, Morphosys; he has received drug/equipment supplied by entity from Abbvie, Astra-Zeneca, Celgene, Gilead, Roche, Janssen, Novartis, Morphosys. VP has received grants from Deutsche Krebshilfe (German Cancer Aid), Chugai, Abbvie, Amgen, Roche and Bristol Myers Squibb. GH has received grants from Roche and Bristol Myers Squibb and personal fees from Bristol Myers Squibb, Roche, Amgen, Spectrum and MSD. All the other authors have no conflicts of interest to disclose., (Copyright © 2023 the Author(s). Published by Wolters Kluwer Health, Inc. on behalf of the European Hematology Association.)

UNFOLDER (NCT00278408, EUDRACT 2005-005218-19) is a phase-3 trial in patients with aggressive B-cell lymphoma and intermediate prognosis, including primary mediastinal B-cell lymphoma (PMBCL). In a 2 × 2 factorial design, patients were randomized to 6× R-CHOP-14 or R-CHOP-21 (rituximab, cyclophosphamide, doxorubicin, vincristine, and prediso(lo)ne) and to consolidation radiotherapy to extralymphatic/bulky disease or observation. Response was assessed according to the standardized criteria from 1999, which did not include F-18 fluordesoxyglucose positron emission tomography/computed tomography (FDG-PET) scans. Primary end point was event-free survival (EFS). A subgroup of 131 patients with PMBCLs was included (median age, 34 y; 54% female, 79% elevated lactate dehydrogenase (LDH), 20% LDH >2× upper limit of normal [ULN], and 24% extralymphatic involvement). Eighty-two (R-CHOP-21: 43 and R-CHOP-14: 39) patients were assigned to radiotherapy and 49 (R-CHOP-21: 27, R-CHOP-14: 22) to observation. The 3-year EFS was superior in radiotherapy arm (94% [95% confidence interval (CI), 89-99] versus 78% [95% CI, 66-89]; P = 0.0069), due to a lower rate of partial responses (PRs) (2% versus 10%). PR triggered additional treatment, mostly radiotherapy (n = 5; PR: 4; complete response/unconfirmed complete response: 1). No significant differences were observed in progression-free survival (PFS) (95% [95% CI, 90-100] versus 90% [95% CI, 81-98]; P = 0.25) nor in overall survival (OS) (98% [95% CI, 94-100] versus 96% [95% CI, 90-100]; P = 0.64). Comparing R-CHOP-14 and R-CHOP-21, EFS, PFS, and OS were not different. A prognostic marker for adverse outcome was elevated LDH >2× ULN (EFS: P = 0.016; PFS: P = 0.0049; OS: P = 0.0014). With the limitation of a pre-PET-era trial, the results suggest a benefit of radiotherapy only for patients responding to R-CHOP with PR. PMBCL treated with R-CHOP have a favorable prognosis with a 3-year OS of 97%., Competing Interests: GH has received grants from Roche and Bristol-Myers Squibb and personal fees from Bristol-Myers Squibb, Roche, Amgen, Spectrum and MSD. L Thurner has received travel grants from Abbvie, Janssen and EUSA-Pharm, and has indicated consultancy for Takeda, Astra-Zeneca, Merck, EUSA-pharm. VP has received grants from Deutsche Krebshilfe (German Cancer Aid), Chugai, Abbvie, Amgen, Roche, and Bristol-Myers Squibb. AV has received honoraria from Roche, Amgen, Kite, Gilead, Novartis, Bristol-Myers Squibb and has indicated a membership of the advisory board of Roche, Amgen, Kite, Gilead, Novartis, Bristol-Myers Squibb. MN has received travel grants from Roche, Celgene, and MSD and personal fees from Roche, Celgene, MSD, Janssen, Amgen, Incyte, and Abbvie. FG participates in advisory board of Roche, Boehringer Ingelheim, Abbvie, Merck, Takeda, MSD, Sanofi, Pfizer, Novartis, Amgen, and Janssen. PdNB has indicated consultancy for Roche, Incyte, and Novartis. SS has received grants from Abbvie, Astra-Zeneca, Celgene, Gilead, Roche, Janssen, Novartis, Morphosys and has indicated consultancy for for Abbvie, Astra-Zeneca, Celgene, Gilead, Roche, Janssen, Novartis, Morphosys; he has received drug/equipment supplied by entity from Abbvie, Astra-Zeneca, Celgene, Gilead, Roche, Janssen, Novartis, Morphosys. All the other authors have no conflicts of interest to disclose., (Copyright © 2023 the Author(s). Published by Wolters Kluwer Health, Inc. on behalf of the European Hematology Association.)