Overall survival in patients with metastatic or locally advanced pancreatic cancer following chemoradiation with novel combination of aldoxorubicin, N-803 IL-15 superagonist, and PDL1- NK cell therapy.

720 Background: Pancreatic cancer claimed an estimated 47,050 lives in the USA in 2020, with an expected median overall survival (OS) of 3 months in 3rd line. (Manax ASCO GI 2019), with no evidence of disease control in these late stage patients. We hypothesize that effective response against pancreatic cancer requires orchestration of both the innate and adaptive immune system to accomplish immunogenic cell death with survival benefit. Herein we report updated results of the fully enrolled cohort of a novel combination immunotherapy protocol of low-dose chemoradiation, cytokine-induced NK and T cell activation via N-803 (an IL-15 cytokine superagonist ), and allogeneic off-the-shelf PDL1-targeted high-affinity NK cell (PDL1 t-haNK) infusion. Methods: We report data from a multi-center study, on 83 3rd line or greater, subjects treated with low dose, chemo radiation Nab-paclitaxel (100 mg/ m2 IV), Gemcitabine (600 mg/m2 IV); Cyclophosphamide (50 mg PO BID) and low dose SBRT. This induction immuno-modulation therapy to induce DAMPs was followed with investigational agents activating the innate and adaptive systems: Aldoxorubicin (150 mg/m2 IV), N-803, an IL-15 superagonist (15 μg/kg SC) and PD-L1 t-haNK (~2 × 109cells/dose IV). Prophylactic G-CSF or EPO was not allowed. All treatments were administered on an outpatient basis. Results: As of submission, median follow-up is 4.9 months. Median age 62, M:F ratio 46:36. ECOG 0-1,97%. 74/83 (89%) reported at least 1 investigational product related AE (TRAE) with 63/83 (76%) reporting at least 1 TRA grade 3 or higher. The most common were anemia 41%, neutropenia 20%, thrombocytopenia 10%, all others <10%. SAEs attributed to investigational agents were reported in 8/83 (10%) patients. Treatment is ongoing for 6 subjects (7%), with 17.1 months as the longest duration on therapy to date. Median OS is 5.7 months (95% CI: 4.9, 6.4) with 26/83 alive to date. Median PFS is 2.3 months (95% CI: 2.0, 3.6) and 37% of subjects achieving stable disease >=8 weeks. Median OS in 3 rd line (N=38) is 6.3 months, Median OS in 4 th line or greater (N=40) is 5.0 months. Conclusions: Historical 3 month median OS in 3 rd line metastatic pancreatic cancer patients has been exceeded. A doubling of survival in 3 rd line is seen in QUILT 88 investigating a novel combination immunotherapy protocol of low-dose chemoradiation, N-803 and PDL1 t-haNK therapy. Updated data will be presented. Clinical trial information: NCT03563144 .