FT596 With Rituximab as Relapse Prevention After Autologous HSCT for NHL

This study uses a single dose of the investigational product FT596 in the early post-transplant period. Rituximab or an FDA approved by biosimilar including Rituxan®, Truxima®, and Ruxience™ is given 48 to 72 hours prior to FT596. The goal of this study is to 1) establish a maximum tolerated dose (MTD) of FT596 when given 30 days after transplant and 2) to confirm the MTD and safety of giving a single dose of FT596 at Day 7 post-transplant starting at one dose level below the MTD identified at Day 30.

Inclusion criteria

• Diagnosis of diffuse large B cell lymphoma or aggressive (high-grade) B-cell lymphoma for which an autologous stem cell transplant is planned or recently completed
• High risk for relapse defined as at least one of the below:

• Primary induction failure (no complete or partial remission at any point after diagnosis
• Initial remission duration < 12 months
• Lack of complete metabolic (PET scan) response after 2-3 cycles of salvage chemotherapy
• Evidence of c-myc and bcl-2 and/or bcl-6 re-arrangement (double hit or triple hit lymphoma)
• Age-adjusted IPI 2-3 at relapse
• Age 18 years or older at the time of signing consent.
• Agrees to use adequate contraception (or evidence of sterility) for at least 12 months after the last dose of rituximab.
• Agrees and signs the separate consent for up to 15 years of follow-up (Long-term Follow-up study CPRC#2020LS052)
• Provides voluntary written consent prior to the performance of any research related activities.

Exclusion criteria

• Receipt of any investigational therapy within 28 days prior to the first dose of FT596 or planned use of an investigational therapy during the first 100 days after transplant
• Planned post-transplant irradiation prior to Day +100
• Seropositive for HIV, active Hepatitis B or C infection with detectable viral load by PCR
• Body weight <50kg
• Known allergy to the following FT596 components: albumin (human) or DMSO
• Unable to receive rituximab

Post-HSCT Reconfirmation of eligibility

• No life-threatening medical issues (i.e. ongoing Grade 4 adverse events) where, in the opinion of the treating investigator, use of FT596 is not in the patient's best interest.
• No active uncontrolled infection.
• Adequate organ function post-transplant including:

• alanine aminotransferase (ALT) and aspartate aminotransferase (AST) ≤5 x ULN (Grade 2 CTCAE v5)
• total bilirubin ≤1.5 x ULN (Grade 1 CTCAE v5)
• serum creatinine ≤1.5 x ULN (Grade 1 CTCAE v5)
• oxygen saturation ≥93% on room air
• For Day 30 dosing only - CBC requirement consistent with engraftment (ANC>500, platelet>20,000 without transfusion support within previous 7 days). There are no CBC parameters for Day 7 dosing.
• No requirement for systemic immunosuppressive therapy (> 5mg prednisone daily) during the FT596 dosing period.