The study will assess the combination of NALIRIFOX (a chemotherapy regimen including liposomal irinotecan) and SBRT in patients with locally advanced unresectable pancreatic cancer. NALIRIFOX consists of liposomal irinotecan, oxaliplatin, 5-FU, and leucovorin, administered in 10-12 cycles every two weeks. SBRT will be applied after a variable period of chemotherapy, randomzing either early or late in the treatment course. The study's main endpoint is progression-free survival (PFS), which is the time from the start of treatment to disease progression or death. Secondary endpoints include ORR, DCR, and OS, providing a comprehensive evaluation of the treatment's effectiveness. Furthermore, the safety profile of the combination will be evaluated, focusing on adverse events using the NCI-CTCAE version 5.0. A total of 42 patients will be enrolled, with an expected follow-up duration of 24 months. The study is designed to explore whether this combined modality can improve outcomes for patients.