Hepatic Arterial Infusion of Sodium Bicarbonate (NaHCO3) Combined With NASOX Regimen and Programmed Death-1 (PD-1) Inhibitors for Pancreatic Cancer Liver Metastases

Inclusion Criteria:

* Aged 18 years and above, with no gender restrictions;
* Pathologically confirmed pancreatic cancer (originating from the pancreatic ductal epithelium), with metastasis to the liver;
* Eastern Cooperative Oncology Group (ECOG) performance status score of 0 to 2;
* Adequate organ function, meeting the following criteria:

  a. Hematological tests:
  1. Neutrophils ≥ 1.5 × 10⁹ /L;
  2. White blood cells ≥ 3.0 × 10⁹ /L;
  3. Platelets ≥ 85 × 10⁹ /L;
  4. Hemoglobin ≥ 70 g/L; b. Biochemical tests:

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  1. Total bilirubin ≤ 2× upper limit of normal (ULN) (for subjects with biliary obstruction, after biliary drainage ≤ 2.5 × ULN);
  2. Aspartate aminotransferase (AST) and alanine aminotransferase (ALT) in metastatic subjects ≤ 5 × ULN;
  3. Albumin level ≥ 28 g/L;
  4. Creatinine clearance rate ≥ 60 ml/min; c. Cardiac function tests:

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  1. Normal electrocardiogram (ECG) or ECG abnormalities deemed clinically insignificant by the investigator;
  2. Left ventricular ejection fraction (LVEF) ≥ lower limit of normal;
* At least 3 weeks post-surgery, radiotherapy, chemotherapy, or other anti-tumor treatments, with general physical condition or related adverse reactions having recovered (toxicity ≤ grade 1) or stabilized;
* Willing to participate and sign the informed consent form;
* Good compliance and agreement to cooperate with survival follow-up.

Exclusion Criteria:

* Subjects with ascites requiring clinical intervention (including moderate to large amounts of ascites; subjects with ascites need to be stable for more than 4 weeks after drainage);
* Clinically severe gastrointestinal diseases (including bleeding, infectious inflammation, perforation, obstruction, or diarrhea greater than grade 1);
* NRS pain score ≥ 4 after standardized treatment with analgesics;
* Second primary malignancy within 5 years (except cured carcinoma in situ, basal cell, or squamous cell skin cancer; subjects with other previous tumors can be enrolled if there has been no recurrence within 5 years);
* Uncontrolled cardiovascular or cerebrovascular diseases with clinical symptoms, including but not limited to: ① NYHA class III or higher heart failure; ② unstable angina; ③ myocardial infarction or stroke within 6 months; ④ supraventricular or ventricular arrhythmias requiring treatment or intervention; ⑤ uncontrolled hypertension (systolic blood pressure \&gt; 150 mmHg and/or diastolic blood pressure \&gt; 90 mmHg despite optimal treatment);
* Known active hepatitis B subjects (HBsAg positive and HBV DNA ≥ 10³ copies or ≥ 1000 U/ml);
* Active infection or unexplained fever \&gt; 38.5°C during the screening period or on the day of administration (subjects with fever caused by tumors can be enrolled as judged by the investigator), which, in the investigator\&#39;s judgment, would affect the subject\&#39;s participation in this trial or interfere with the evaluation of efficacy;
* Pregnant or breastfeeding women;
* Women of childbearing potential with a positive blood (urine) pregnancy test during the screening period (both male and female subjects should use reliable contraception during the trial and for 3 months after the last dose to prevent pregnancy);
* Subjects with other medical or social issues that, in the investigator\&#39;s judgment, might affect their ability to sign informed consent, participation in the trial, or interpretation of the trial results;
* Patients with an estimated survival time of ≤ 3 months are not included in this study.