B-cell lymphoid malignancies include CLL and NHL and are defined by clonal populations of B-lymphocytes expressing identical surface antigens. CD22 is a surface protein specifically expressed on B-lymphocytes and is expressed in B-lymphocytic malignancies. It is known to negatively regulate the B-cell receptor via its cytosolic immunoreceptor tyrosine-based inhibitory motifs. JNJ-75348780 is a novel human bispecific antibody that recognizes the CD3 antigen on T-lymphocytes and the CD22 antigen on mature and malignant B-lymphocytes. JNJ-75348780 is hypothesized to lead to cytotoxicity, T-cell activation, and induction of cytokines upon engagement of CD3 on T-cells and CD22 on malignant B-lymphocytes. The study consists of screening phase, treatment phase and post-treatment phase. The total study duration will be up to 2 years 10 months. Efficacy assessments will include radiographic image assessments, positron emission tomography scan, bone marrow assessment, endoscopy or colonoscopy, physical examinations. Safety will be monitored throughout the study.
The purpose of this study is to characterize safety and to determine the putative recommended Phase 2 dose(s) (RP2D[s]) and optimal dosing schedule(s) of JNJ-75348780 in participants with relapsed/ refractory B-cell Non-Hodgkin Lymphoma (NHL) and Chronic Lymphocytic Leukemia (CLL) in Part A and to further characterize the safety at the RP2D(s) in Part B.