“…Despite the approval and rather extensive clinical use of belimumab, additional questions about the efficacy and best utilization of anti–B cell agents are also raised by the negative or inconsistent results that have been obtained with other antagonists of tumor necrosis factor superfamily receptors that regulate B cell tolerance, activation, and survival, including atacicept (previously known as TACI‐Ig; a fusion protein that blocks B lymphocyte stimulator [BLyS] and APRIL) and tabalumab (a human IgG4 monoclonal antibody that binds soluble and membrane‐bound BLyS) . All the while, there continues to be a great need for better treatments, as indicated by evidence that even in the 2000s the risk of end‐stage renal disease may be >40% over 15 years in patients with class IV lupus nephritis , and by the rarity of sustained disease remission, with disease remaining in remission for 3 years in only 15% of patients and for >10 years in <4% of patients .…”