RecruitingPhase 1Biological interventionA Study of SPX-303, a Bispecific Antibody Targeting LILRB2 and PD-L1 in Patients With Solid TumorsPart 1 of this study is an open-label, dose-escalation, and safety expansion study of an anti-LILRB2 / anti-PD-L1 bispecific antibody SPX- 303 in patients with solid tumors. Part 2 of this study is an indication-specific dose expansion study of SPX-303.