Bapotulimab (Anti-ILDR2) is a fully human immunoglobulin G2 (IgG2) monoclonal antibody against the immune checkpoint immunoglobulin-like domain containing receptor 2 (ILDR2; Chromosome 1 Open Reading Frame 32; C1orf32), with potential immune checkpoint inhibitory and antineoplastic activities. MW : 145.24 kD.