A Phase 1/2a Study Evaluating Allocetra-OTS as Monotherapy or in Combination With Anti-PD-1 Therapy for the Treatment of Advanced Solid Tumor Malignancy

Inclusion Criteria: 1. Patients must have histologically or cytologically confirmed locally advanced, unresectable or metastatic solid tumors, that have relapsed or have been refractory to available approved therapies, or patients who are not eligible for or declined additional standard of care systemic therapy. Patients with peritoneal carcinomatosis can be eligible if an appropriate IP catheter or port can be placed. 2. Patients must have measurable disease. 3. Age ≥ 18 years old. 4. ECOG performance status ≤1. 5. Adequate renal function, hepatic function, and bone marrow function. Exclusion Criteria: 1. Primary central nervous system (CNS) malignancy or CNS involvement, unless stable clinically. 2. Clinically significant uncontrolled infection, autoimmune or inflammatory diseases requiring systemic immunosuppression, clinically significant cardiovascular disease, severe pulmonary diseases or additional malignancies. 3. \[For patients in Stage 2\] Patients who previously experienced an ICI-related adverse reaction that resulted in discontinuation of the ICI.