fontolizumab fontolizumab fontolizumab (planned trade name huzaf) is a humanized monoclonal antibody and an immunosuppressive drug for the treatment of auto-immune diseases like crohn's disease. a phase ii clinical trial investigating the use for rheumatoid arthritis was terminated because the first phase did not meet the endpoint. fontolizumabmonoclonal antibodytypewhole antibodysourcehumanized (from mouse)targetinterferon gammaclinical dataatc codenoneidentifierscas number326859-36-3 nchemspidernoneunii6j92h2439zkeggd04242 ychemical and physical datamolar massca. 150 kg/mol ny (what is this?) (verify)