Tumor Associated Antigen Specific T Cells (TAA-T) With PD1 Inhibitor for Lymphoma

This Phase I, open-label multi-site trial is designed to evaluate the safety of administering rapidly-generated multi-antigen-specific T lymphocytes with the PD1 inhibitor Nivolumab, to relapsed/refractory (rel/ref) lymphoma patients with measurable disease (group A) or as adjunctive therapy following autologous HSCT (group B).

This study will first enroll 6 patients total (in Groups A and B) in the initial safety monitoring or DLT group prior to the expansion phase where additional 12 patients (6 in Group A and 6 in Group B) will be enrolled. TAA-T cells will be generated from patient's lymphocytes obtained from patient's PBMC.

If patient meets eligibility criteria for TAA-T cell infusion, the patient (Group A or Group B) will receive two TAA-T cell infusions given 2 weeks apart, where the expected volume of infusion is 1 to 10 cc.

Both TAA-T cells and Nivolumab will be given at the doses below with allowed de-escalation of both doses as follows:

• TAA-T cell dose: 2 x 107 cells/m2 per infusion
• Nivolumab: For patients <18 years, 3 mg/kg/dose (maximum 240mg/dose) every 2 weeks. For adult patients ≥18 years, a dose of 240mg every 2 weeks or 480mg every 4 weeks

From the first 2 enrolled patients, if at least one patient meets dose limiting toxicity criteria (as described in section 6.4.1) at the above mentioned combination dose level, then the next 2 patients will receive TAA-T cells at 1 x 107 cells/m2 without a change in Nivolumab dose. If toxicity criteria are met by at least one patient from these 2 patients, then the dose of Nivolumab will be reduced to 1mg/kg/dose for patients <18 years or 100mg if receiving 240mg dosing or 200mg if receiving 480mg dosing for adult patients ≥18 years for next 2 patients and TAA-T cells will be given at the same de-escalated dose of 1x 107 cells/m2.

In case the patient experiences toxicity from Nivolumab prior to the first TAA-T cell infusion, they can receive the TAA-T cells after resolution of the Nivolumab toxicities and steroid dosing has been reduced less than 0.5mg/kg/day.

After the safety phase is complete, additional 12 patients total will be enrolled on expansion cohort.

Patients will receive doses Nivolumab at a minimum of 8 weeks prior to first TAA-T cell infusion and additional dose(s) of Nivolumab will be given after 4 weeks following second TAA-T cell infusion starting at week 7 from first infusion of TAA-T.. Delays >3 days for the Nivolumab will not be considered protocol violations if discussed with the PI.

If the TAA-T cells are not ready after the initial doses of Nivolumab prior to the first TAA-T infusion, then the patients can continue Nivolumab infusions for an additional 8 weeks at the PI's discretion. If there is insufficient number of TAA-Ts for the two planned infusions, then additional blood may be drawn and patients can continue on Nivolumab unless they rapidly progress with disease requiring urgent therapy. If there is insufficient number of TAA-Ts to meet study dose, a lower dose of TAA-T may be infused at the discretion of the PI.

Only group A patients are eligible for additional doses ( 3 to 8) if they have stable disease or response, do not have ≥ grade 3 toxicity attributed to TAA-T cells and do not have clinical evidence of rapidly progressing disease requiring urgent therapy.

For Group B patients, blood for generation for TAA-T cells (non-mobilized) will be collected prior to the stem cell collection or any time after Day 30 post auto-HSCT. Treatment with Nivolumab will begin any time after Day 30 post auto-HSCT. Patients are eligible for Group B if they have no evidence of metabolically active disease by PET/CT (Deauville Score of 3 or less) at time of starting treatment with Nivolumab. Patients eligible for Group B with <CMR)/CR (by PET/CT) prior to auto-HSCT will need to be in CR (Deauville Score of 3 or less) prior to the start of Nivolumab or can be moved to Group A if they have metabolically active disease (Deauville Score of 4 or more) by PET/CT.

Patients should not receive other systemic antineoplastic agents including Nivolumab for at least 6 weeks after the first infusion of TAA-specific T-cells (for purposes of evaluation), although such treatment may be added if deemed critical for patient care by the attending physician.

Patients in Group A will not be able to receive additional doses (3-8) of TAA-T cells until the initial 6 weeks evaluation for toxicity and efficacy following the first TAA-T cell infusion.

Patients (Group A and B) will not receive subsequent doses of Nivolumab until the safety evaluation for TAA-T is over (at least 6 weeks from the first infusion).