Purpose of the study Phase I study: to explore the optimal dose combination of irinotecan liposome + oxaliplatin + bevacizumab regimen, irinotecan liposome + oxaliplatin Phase II study: to evaluate the safety and efficacy of the second-line treatment regimen of irinotecan liposome combined with oxaliplatin and bevacizumab compared to the second-line treatment regimen of irinotecan liposome combined with 5-FU/LV in advanced pancreatic cancer Sample size 138 cases Phase I Crawl, sample size 9-18 cases. Phase II randomized controlled clinical study, historical data NAPOLI-1 study, ORR of 8.8% for irinotecan liposome + 5-FU/LV, planned trial arm ORR upgrade to 25%, calculated at 60 cases in each arm.

Subject population Patients with advanced pancreatic cancer diagnosed after failure of first-line therapy, confirmed by histopathology or cytopathology, who meet the inclusion criteria and do not meet the exclusion criteria.

Phase I design:

Liposomal irinotecan + oxaliplatin + bevacizumab, 2-week regimen Liposomal irinotecan: start exploring with 50mg/m2 dose, preset 50mg/m2, 60mg/m2, 2 dose groups, 90min IV infusion, d1; Oxaliplatin: explored from 60mg/m2 dose, preset 60mg/m2, 85mg/m2, 2 dose groups, IV infusion, d1; Bevacizumab: 5 mg/kg, i.v., d1; Phase II study design.

Trial group:

Irinotecan liposomal: RP2D, i.v., 90min, d1; Oxaliplatin: RP2D, i.v., d1; Bevacizumab: 5mg/kg, i.v., d1; Cycles every 2 weeks until disease progression or intolerable; imaging every 3 treatment cycles/1.5 months.

Control:

Liposomal irinotecan: 70 mg/m2 IV for 90 min, d1; Calcium folinate: 400 mg/m2, IV infusion over 30 min, d1; 5-FU: 2400 mg/m2, continuous IV infusion over 46h; Cycles every 2 weeks until disease progression or intolerable; imaging every 3 treatment cycles/1.5 months.

Notes:

If the duration of irinotecan liposome infusion can be extended appropriately based on the patient's clinical response; if the patient withdraws from the trial due to intolerance of toxicity (e.g., neurotoxicity or myelotoxicity) induced by one of the drugs, follow up is required until PFS and OS.

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Inclusion Criteria:

1. Age 18 to 75 years old;
2. Patients with pancreatic cancer diagnosed by histopathology or cytology;
3. Unresectable disease assessed by multidisciplinary and imaging;
4. Subjects who have received prior failed first-line therapy, and recurrence within 6 months of the end of (neo)adjuvant therapy is considered a first-line treatment failure;
5. Subjects who have not received platinum-containing or irinotecan drugs for prior first-line therapy;
6. Patients with at least one evaluable lesion according to RECIST v1.1;
7. ECOG score of 0-2;
8. Expected survival ≥ 3 months;
9. Bone marrow function: absolute neutrophil count (ANC) ≥1.5×10^9/L, hemoglobin ≥90 g/dL, platelets (PLT) ≥100×10^9/L, and white blood cells (WBC) ≥3.0×10^9/L;
10. Liver function: alanine aminotransferase (ALT), alanine aminotransferase (AST), alkaline phosphatase (ALP) ≤2.5 times the upper limit of normal (ULN), or ≤5×ULN if liver metastases are present, total bilirubin<1.5 ULN;
11. Renal function: serum creatinine (Cr) ≤1.5 × ULN or creatinine clearance (CCr) ≥60 mL/min (according to the Cockcroft-Gault formula);
12. Coagulation function: prothrombin time (PT), activated partial thromboplastin time (APTT) and international normalized ratio (INR) ≤1.5 × ULN;
13. Patients with biliary obstruction should receive adequate biliary drainage; and
14. Adverse reactions arising from prior therapy must be restored to grade 1 or baseline according to CTCAE 5.0 (with the exception of toxicities such as alopecia, grade 2 or lower peripheral neuropathy, which can be enrolled with no safety risk in the judgment of the investigator);
15. Non-pregnant or lactating females; females/males of childbearing potential should use effective contraception during the study and for 6 months after completion of study treatment;
16. Patients are compliant, understand the study procedures, and sign a written informed consent form.

Exclusion Criteria:

1. Patients who have had other malignant tumors within the previous 5 years (except cured carcinoma in situ and basal cell carcinoma of the skin);
2. Uncontrollable pleural effusion or ascites;
3. Any known brain metastasis or meningeal metastasis;
4. Concomitant use of a potent CYP3A4 inducer within 3 weeks prior to the first dose, or concurrent use of a potent CYP3A4 inhibitor or potent UGT1A1 inhibitor within 3 weeks prior to the first dose;
5. Patients undergoing major organ surgery (except needle biopsy, central venous catheterization, port catheterization, stent placement for relief of biliary obstruction, percutaneous hepato-biliary drainage, cholecystostomy) or elective surgical procedures scheduled within 4 weeks prior to the first dose of study drug;
6. Systemically treated active, uncontrolled bacterial, viral, or fungal infections, defined as persistent signs/symptoms associated with the infection that do not improve despite appropriate antibiotics, antiviral therapy, and/or other treatments;
7. Subjects with congenital or acquired immunodeficiency, such as HIV-infected individuals or active hepatitis (transaminases do not meet the inclusion criteria, Hepatitis B : HBV DNA ≥ 1000 IU/ml; Hepatitis C : HCV RNA ≥ 1000 IU/ml); chronic hepatitis B viral carriers, with HBV DNA < 2000 IU/ml, who must be concurrently receiving antiviral during the trial period treatment before enrollment;
8. Presence of serious concomitant diseases: those with diabetes mellitus that cannot be well controlled by glucose-lowering drugs, difficult-to-control hypertension, severe cardiovascular and cerebral vascular disease, renal failure, hepatic failure, uncontrolled epilepsy, central nervous system disease or history of mental disorders, those with a clear tendency to gastrointestinal bleeding, intestinal paralysis, intestinal obstruction, etc;
9. >grade 1 diarrhea with an increase in the number of bowel movements >4 times per day compared to baseline; moderate to severe increase in stoma discharge; limited instrumental activities of daily living or even limited spontaneous activities of daily living; life-threatening; requiring urgent treatment;
10. Those with serum albumin ≤ 3 g/dL;
11. Those who had participated in other clinical studies within 4 weeks prior to enrollment;
12. Patients assessed by the investigator to be unsuitable for participation in the trial.