RecruitingPhase 2Biological interventionA Study of Rapcabtagene Autoleucel in Active, Refractory Systemic Lupus Erythematosus (SLE) or Lupus Nephritis (LN) Patients (AUTOGRAPH - SLE/LN)The purpose of this study is to evaluate the efficacy and safety of rapcabtagene autoleucel (administered once following lymphodepletion) in patients with active, refractory systemic lupus erythematosus (SLE) or active, refractory lupus nephritis (LN).