RecruitingPhase 2Drug trialA Phase II Study of Axicabtagene Ciloleucel, an Anti-CD19 Chimeric Antigen Receptor (CAR) Tcell Therapy, in Combination With Radiotherapy (RT) in Relapsed/Refractory Follicular LymphomaTo learn about the safety of a drug called axicabtagene ciloleucel given in combination with radiation therapy to patients with relapsed/refractory FL.