An Open-Label, Phase 1 Study to Investigate the Safety, Pharmacokinetics, Pharmacodynamics, and Antitumor Activity of AB821 in Adult Participants With Locally Advanced or Metastatic Melanoma and Other Solid Tumors

This study is a first-in-human, open-label, nonrandomized, single center Phase 1 dose-escalation study to assess the safety, pharmacokinetics, pharmacodynamics, immunogenicity, and preliminary antitumor activity of AB821 monotherapy given every 2 weeks (Q2W) in participants with recurrent locally advanced or metastatic melanoma and other immune-responsive solid tumors. Immune-responsive solid tumors are defined as those for which immune checkpoint inhibitors form part of the standard-of-care therapy.