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Significance Agonistic antibodies targeting key TNF receptor (TNFR) molecules involved in antitumor responses have been demonstrated as potent antitumor therapies in preclinical studies. However, no effective agonistic anti-TNFR therapies have been successfully developed to date. In contrast, cytotoxic antitumor antibodies targeting tumor antigens or antagonistic antibodies blocking key inhibitory checkpoints are widely used in clinical settings. One explanation for this discrepancy has been recently provided by the finding that agonistic anti-TNFR antibodies have a previously unappreciated requirement for inhibitory Fcγ receptor FcγRIIB coengagement. Understanding the differential FcγRIIB coengagement requirement by different antibodies and the in vivo cross-linking function of FcγRIIB, as defined by this study, not only has implications for the development of potent agonistic anti-TNFR therapies but also for the understanding of TNFR activation mechanisms.

Antitumor activities of agonistic anti-TNFR antibodies require differential FcγRIIB coengagement in vivo