NCT04137900 2024-02-05Safety, Tolerability and Pharmacokinetics of a Monoclonal Antibody Specific to B-and T-Lymphocyte Attenuator (BTLA) as Monotherapy and in Combination With an Anti-PD1 Monoclonal Antibody for Injection in Subjects With Advanced MalignanciesTopAlliance BiosciencesPhase 1 Unknown499 enrolled