A Phase II Study of Axicabtagene Ciloleucel, an Anti-CD19 Chimeric Antigen Receptor (CAR) Tcell Therapy, in Combination With Radiotherapy (RT) in Relapsed/Refractory Follicular Lymphoma

Inclusion Criteria: Eligible subjects will be considered for inclusion if they meet all of the following criteria: * Men and women 18 years of age or older * Histologically proven FL (Grade 1-3A) on most recent biopsy, history of transformed follicular lymphoma permitted at clinician discretion) * Patients with follicular lymphoma must have disease that has relapsed or is refractory to 2 or more prior lines of systemic therapy * (ECOG) performance status of 0-2 * Medically appropriate for CAR-T cell therapy: adequate organ function CrCL \>/= 45 mL/min/m2, hemoglobin level ≥ 8 g/dl, serum alanine aminotransferase (ALT)/aspartate aminotransferase (AST) levels ≤ 2.5 × upper limit of normal (ULN) or ≤ 5 x ULN if documented liver involvement, baseline oxygen saturation levels (SpO2) ≥92% on room air * Have at least 1 measurable lesion on imaging, defined as a lesion that can be accurately measured in at least one dimension (longest diameter to be recorded for non-nodal lesions and short axis for nodal lesions) and ≥1 cm on CT, MRI, or clinical exam. * Prior radiation therapy is permitted provided normal tissue tolerance is not exceeded * Female of child-bearing potential (FOCBP, defined below) must have a negative pregnancy test within 1 week of simulation for RT * Ability to understand and the willingness to sign a written informed consent document. Exclusion Criteria: * History of other (non B-cell lymphoma) invasive malignancy requiring active therapy (systemic therapy, rad…