Liposomal Irinotecan, 5-fluorouracil/Calcium Folinate, Oxaliplatin, and Adebrelimab in Combination With Radiotherapy for Resectable or Borderline Resectable Pancreatic Cancer With Risk Factors：A Prospective Exploratory Study
Pancreatic cancer is a highly malignant digestive system tumor with a very poor prognosis. In recent years, both the incidence and mortality rates of pancreatic cancer have shown a marked upward trend worldwide. Global cancer statistics from 2020 indicate that approximately 495,000 new cases of pancreatic cancer are diagnosed annually, with about 466,000 deaths attributed to this disease each year. Based on the anatomical relationship between the tumor and blood vessels, pancreatic cancer is classified into three types: resectable, borderline resectable, and unresectable. The onset of pancreatic cancer is often insidious, with approximately 80% of patients presenting with advanced disease at the time of initial diagnosis, thereby losing the opportunity for radical surgical resection. Only 15-20% of patients are eligible for radical surgery at the time of initial diagnosis. However, even after surgical resection, many patients still experience early recurrence, leading to a very poor prognosis. This highlights the significant limitations of relying solely on surgery for disease control. Currently, there is no standard neoadjuvant treatment protocol for pancreatic cancer. Recent neoadjuvant clinical trials have primarily referenced chemotherapy regimens used for advanced pancreatic cancer, which may include chemotherapy and/or radiotherapy. Recommended chemotherapy regimens include the FOLFIRINOX regimen, gemcitabine plus nab-paclitaxel, gemcitabine plus cisplatin (for BRCA1/2 mutations), and gemcitabine plus S-1. At the 2023 ASCO Annual Meeting, updated data from the NAPOLI-3 study showed that the NALIRIFOX regimen (irinotecan liposome, oxaliplatin, 5-fluorouracil, and leucovorin) achieved overall survival (OS) endpoints in first-line treatment of metastatic pancreatic cancer patients compared to the AG regimen, with clinical significance. Based on this study, the NCCN guidelines have included the NALIRIFOX regimen as a recommended first-line treatment for advanced pancreatic cancer. Given the therapeutic and safety advantages of irinotecan liposome over irinotecan in pancreatic cancer, this study aims to further explore the efficacy and safety of irinotecan liposome, 5-fluorouracil/leucovorin, oxaliplatin, and adabelimab combined with radiotherapy for resectable or borderline resectable pancreatic cancer with high-risk factors. The goal is to identify a more effective treatment option for patients with borderline resectable pancreatic cancer (BRPC) and resectable pancreatic cancer (RPC), thereby improving survival outcomes. This study is a prospective, single-arm, exploratory trial designed to evaluate the efficacy and safety of irinotecan liposome, 5-fluorouracil/leucovorin, oxaliplatin, and adabelimab combined with radiotherapy for resectable or borderline resectable pancreatic cancer with high-risk factors, with a planned enrollment of 37 patients. After screening and meeting the inclusion and exclusion criteria, eligible patients will provide informed consent and undergo neoadjuvant treatment with irinotecan liposome, 5-fluorouracil/leucovorin, oxaliplatin, and adabelimab (with a 2-week cycle) for a total of four cycles of preoperative chemotherapy combined with immunotherapy, along with five sessions of short-course radiotherapy.
⁃ Patients must meet the following criteria to be eligible for enrollment in this study:
• Age 18 to 75 years, regardless of gender;
• Histologically or cytologically confirmed pancreatic cancer (arising from the pancreatic ductal epithelium), as assessed by a multidisciplinary team (MDT), with clinical records indicating resectable or borderline resectable pancreatic cancer with high-risk factors. (According to the 2022 edition of the CSCO guidelines, borderline resectable pancreatic cancer is defined as: ① Tumor contact with the portal vein-superior mesenteric vein \> 180°, or contact ≤180° combined with irregular venous contour or venous thrombosis, but with the possibility of complete resection and safe reconstruction; tumor contact with the inferior vena cava; ② (For pancreatic head/uncinate process tumors) Tumor contact with the common hepatic artery, but without involvement of the celiac artery or the origin of the left or right hepatic arteries, with the possibility of complete resection and safe reconstruction; tumor contact with the superior mesenteric artery ≤180°; tumor contact with variant arteries (e.g., accessory right hepatic artery, replaced right hepatic artery, replaced common hepatic artery, etc.). (For pancreatic body/tail tumors) Tumor contact with the superior mesenteric artery ≤180°; tumor contact with the celiac artery ≤180°.) (According to the 2022 edition of the CSCO guidelines, high-risk factors are defined as very high CA19-9, large primary tumor, massive regional lymph node metastasis, significant weight loss, and severe pain. In this study, high-risk factors are defined as CA199 \> 200 U/mL, maximum tumor diameter \> 2 cm, N1 or higher.)
• Presence of at least one measurable lesion as a target lesion (according to RECIST v1.1 criteria);
• No prior anti-tumor treatment (including radiotherapy, ablation, chemotherapy, targeted therapy, immunotherapy, etc.) or investigational drug therapy;
• ECOG performance status: 0-1;
• Life expectancy of ≥ 3 months;
• Adequate function of major organs, defined as meeting the following criteria (without transfusion of blood products or administration of hematopoietic growth factors within 14 days prior to randomization):
⁃ (1) Absolute neutrophil count ≥ 1.5 × 10⁹/L; platelets ≥ 80 × 10⁹/L; hemoglobin ≥ 9 g/dL; serum albumin ≥ 3 g/dL; (2) Total bilirubin ≤ 1.5 × upper limit of normal (ULN) (biliary drainage is permitted for biliary obstruction); alanine aminotransferase (ALT) and aspartate aminotransferase (AST) ≤ 3 × ULN (for patients with liver metastasis, up to ≤ 5 × ULN is allowed); (3) Serum creatinine ≤ 1.5 × ULN, and creatinine clearance ≥ 60 mL/min; (4) International Normalized Ratio (INR) ≤ 1.5 × ULN and activated partial thromboplastin time (APTT) ≤ 1.5 × ULN (patients on stable doses of anticoagulation therapy, such as low molecular weight heparin or warfarin, with INR within the therapeutic range of the anticoagulant, are eligible for screening); (5) Electrocardiogram: QTcF ≤ 450 ms (male), ≤ 470 ms (female); (6) Echocardiogram: Left ventricular ejection fraction (LVEF) ≥ 50%; 8. Women of childbearing potential must have a negative serum pregnancy test within 3 days prior to randomization and agree to use an appropriate method of contraception during the study and for 6 months after the end of treatment. For men, they should be surgically sterile or agree to use an appropriate method of contraception during the study and for 3 months after the end of treatment; 9. The subject voluntarily agrees to participate in this study and provides written informed consent.