Bortezomib Combined with PD-1 MAb and MFOLFIRINOX for Metastatic Pancreatic Cancer

Inclusion Criteria:

* Pathologically (histologically or cytologically) confirmed pancreatic ductal adenocarcinoma (PDAC).
* Recurrent disease or metastatic disease (such as liver, peritoneum, lung) evaluated by abdominal contrast-enhanced CT, MRI, and chest CT. PET/CT or other imaging examinations would be used if necessary.
* Never receive any systematic treatment or Progression after fisrt line Gemcitabine base chemotherapy
* ECOG score 0 or 1.
* Serum creatinine level is normal, and serum total bilirubin level is less than 1.5 x ULN.
* ALT and AST are less than 2 x ULN.
* Signed informed consent.

Exclusion Criteria:

* History of participation of other clinical trails within 4 weeks
* History of autoimmune disease or other condition receiving glucocorticoid treatment
* History of receiving chemotherapy within 2 weeks
* History of radiotherapy and molecular target therapy within 2 weeks
* History if active tuberculosis
* History of malignance treatment in the past, excluding basal and cutaneous squamous cell carcinoma, cervical carcinoma in situ, papillary thyroid carcinoma
* Major cardiovascular diseases (including myocardial infarction, unstable angina, congestive heart failure, severe uncontrolled arrhythmia) during the past six months of enrollment.
* Hematological precancerous diseases, such as myelodysplastic syndromes.
* Evidence of clinical-related or previous interstitial lung disease, such as noninfectious pneumonia or pulmonary fibrosis, or baseline chest CT scan or chest X-ray findings
* Previous or physical findings of central nervous system disease, except for adequately treated (e.g. primary brain tumors, uncontrolled seizures or strokes with standard medications)
* Preexisting neuropathy \> 1 (NCI CTCAE).
* Immune deficiency syndrome, such as active tuberculosis and HIV infection.
* Allograft requires immunosuppressive therapy or other major immunosuppressive therapies.
* Severe serious wounds, ulcers or fractures.
* Clinical evaluation is unacceptable