Inclusion Criteria:

          1. Signed informed consent must be obtained prior to participation in the study

          2. Patients must be ≥18 years of age at the time of ICF signature

          3. Histologically confirmed DLBCL at last relapse (including DLBCL transformed from
             follicular lymphoma and double-triple hit lymphoma)

          4. Relapsed or refractory disease after at least 2 lines of systemic therapy, including
             anti-CD20 antibody and an anthracycline, or having failed or being ineligible for
             autologous HSCT

          5. ECOG performance status that is either 0 or 1 at screening

          6. Measurable disease at time of enrollment:

               -  Nodal lesions greater than 15 mm in the long axis, regardless of the length of
                  the short axis or

               -  Extra nodal lesion (outside lymph node or nodal mass, but including liver and
                  spleen) at least 10 mm in long and short axis

          7. Adequate organ function

          8. Must have a leukapheresis material of non-mobilized cells available for manufacturing

        Exclusion Criteria:

          1. Prior treatment with anti-CD19 therapy, adoptive T cell therapy, or any prior gene
             therapy product

          2. Primary mediastinal large B-cell lymphoma, EBV+ DLBCL, Richter's transformation,
             Burkitt lymphoma, primary DLBCL of CNS, T cell / histiocyte rich large B-cell
             lymphoma, primary cutaneous DLBCL.

          3. Eligible for and consenting to autologous HSCT

          4. Prior allogeneic SCT

          5. Active CNS involvement by disease under study, except if the CNS involvement has been
             effectively treated (i.e. patient is asymptomatic) and local treatment was greater
             than 4 weeks before enrollment

          6. Active neurological autoimmune or inflammatory disorders (e.g. Guillain-Barre
             syndrome)

          7. Investigational medicinal product within the last 30 days or five half-lives
             (whichever is longer) prior to screening