Declaration of interests AMME reports being the study chair of the EORTC 18071/CA-029 phase 3 clinical trial (Bristol Myers Squibb [BMS]) and of the EORTC 1325/KEYNOTE-054 phase 3 trial (Merck Sharp & Dohme), and has worked in a consulting or advisory role and received honoraria from Biocad, Biotech, BioInvent, BMS, CatalYm, GlaxoSmithKline (GSK), IO Biotech, ISA Pharmaceuticals, Merck, Novartis, Regeneron Pharmaceuticals, Sellas, and SkylineDx. CUB reports receiving grants from BMS, NanoString Technologies, Novartis, and Third Rock Ventures and personal fees from AstraZeneca, BMS, GenMab, Lilly, MSD, Novartis, Pfizer, Pierre Fabre, and Roche during the conduct of the study; he owns stocks in Unity Cars, and is co-founder of Immagene BV. MM reports receiving grants from BMS, MSD, and Roche Novartis and has worked in a consulting or advisory role for BMS, MSD, and Pierre Fabre. GVL has worked in a consulting or advisory role and received honoraria from Aduro Biotech, Amgen, Array BioPharma, Boehringer Ingelheim, BMS, Highlight Therapeutics, MSD, Novartis, Pierre Fabre, QBiotics, Regeneron Pharmaceuticals, and SkylineDX. VGA has worked in a consulting or advisory role and received speaking fees or travel support, or both, from BMS, Merck, MSD, Nektar, Novartis, OncoSec, Pierre Fabre, and Roche. SD reports receiving grants from BMS and MSD. AMH reports receiving personal fees from BMS, MSD, and Novartis. AM has worked in a consulting or advisory role and received honoraria from Amgen, AstraZeneca, Aventis, Bayer, BIOCAD, BMS, Eisai, Eli Lilly, Merck, Sanofi, SERVIER, and Takeda Pharmaceuticals. AK reports grants and personal fees from MSD. MSC has worked in a consulting role and received honoraria from BMS, Eisia, IDEAYA Biosciences, Merck Serano, MSD, Novartis, Oncosec, Pierre Fabre, Q biotics, Roche, and Sanofi. SSa reports receiving grants from Amgen, AstraZeneca, BMS, Endocyte, and MSD. JL reports receiving grants from Achilles Therapeutics, AVEO Pharmaceuticals, BMS, Covance, Genentech/Roche, Immunocore, MSD, Nektar, Novartis, Pharmacyclics, and Pfizer and has worked in a consulting role and received honoraria from Achilles Therapeutics, AstraZeneca, Boston Biomedical, BMS, Covance, Eisai, EUSA Pharma, Genentech/Roche, GSK, Immunocore, Imugene, Incyte, iOnctura, Ipsen, Kymab, Merck Serono, MSD, Nektar, Novartis, Pfizer, Pierre Fabre, Secarna Pharmaceuticals, and Vitaccess. SP received grants from Abbie, Almirall, AMLO Biosciences, Castle Biosciences, La Roche Posay, Leo Pharma, Melagenix, and Sun Pharma, has worked in a consulting role and received honoraria from Almirall, ISDIN, La Roche-Posay, Leo Pharma, Regeneron, Sanofi, and Sun Pharma, and speaker's bureau from Bioderma, BMS, La Roche Posay, Pierre Fabre, Roche, and Sanofi. PAA received grants and research funds from Array BioPharma, BMS, and Genentech/Roche and has worked in a consulting role and received honoraria from 4SC, Array BioPharma, AstraZeneca, BMS, Genentech/Roche Genmab, Idera Pharmaceutials, Immunocore, Incyte, MedImmune, Merck Serono, MSD, NewLink Genetics, Novartis, Pierre Fabre, Sandoz, Sanofi, Sun Pharma, Syndax Pharmaceuticals, and Ultimovacs. PR has worked in a consulting or advisory role and received honoraria from Blueprint Medicines, BMS, MSD, Novartis, Pfizer, and Pierre Fabre. DS has worked in a consulting role and received honoraria from 4SC, Array BioPharma, AstraZeneca, Incyte, Pierre Fabre, and Pfizer. RK has worked in a consulting role and received honoraria from BMS, MSD, Novartis, Pierre Fabre, and Roche. LH-A reports that his institution received fees to conduct clinical trials from Merck, Amgen, BMS, Corvus, Genentech, Immunocore, Merck-EMD, Novartis, Polynoma, Regeneron, and Roche. AMDG has worked in a consulting or advisory role and received fees from BMS, GSK, Pierre Fabre, and Sanofi. AJMvdE has worked in a consulting or advisory role and received fees from BMS, MSD, Merck, Sanofi, Roche, Novartis, Eisai, Ipsen, Pfizer, and Pierre Fabre and grants from BMS, Sanofi, and Roche. J-JG has worked in a consulting or advisory role or received speaker fees, and received fees from Amgen, BMS, Merck, MSD, Novartis, Pfizer, Pierre Fabre, Roche, and Sanofi. RG has worked in an advisory role and received fees from 4SC, Almirall, Amgen, Johnson & Johnson, Merck Serono, MSD, Novartis, Pfizer, Pierre Fabre, Sanofi, and Sun Pharma and received grants from Amgen, Johnson & Johnson, Novartis, and Pfizer. RJ reports receiving grants and patient fees from MSD during the conduct of the study and receiving grants from BMS and Iovance and fees to conduct clinical trials for his institutions from Roche, GSK, AstraZeneca, and Novartis. PCL has worked in a consulting or advisory role and his institution received honoraria and grants from 4SC, Amgen, BMS, Merck, and Novartis. ACJvA reports receiving grants from 4SC, Amgen, BMS, Merck, MSD, Novartis, Pfizer, and Sanofi. CK and NI are employees and shareholders of Merck. MK and SSu report receiving grants from Merck during the conduct of the study. CR has worked in a consulting or advisory role and received honoraria from Amgen, Biothera, BMS, Merck, MSD, Novartis, Pierre Fabre, Roche, Sanofi, and Ultimovacs. SM declares no competing interests.