rontalizumab rontalizumab rontalizumab is a humanized monoclonal antibody being developed by genentech. as of november 2009, it is being investigated in a clinical trial for the treatment of systemic lupus erythematosus. rontalizumabmonoclonal antibodytypewhole antibodysourcehumanizedtargetifn-αclinical dataatc codenoneidentifierscas number948570-30-7 nchemspidernoneuniildo2fiq61ikeggd09662chemical and physical dataformulac6486h9990n1722o2026s44molar mass145917.93 g·mol−1 ny (what is this?) (verify)