TSA-DC Vaccine in Treating Patients With Gastrointestinal Solid Tumor

Inclusion Criteria:

1. Be ≥18 and ≤75,no gender based;
2. Expression of HLA-A0201/1101/2402;
3. Histopathologic documentation of gastrointestinal solid tumors(stomach cancer or colorectal cancer ) concurrent with the diagnosis of metastatic disease, and the tumor is Measurable;
4. Patients must have adequate tissue (fresh or paraffin block) for DNA extraction, which is used for gene sequencing, and prognoses the tumor specific antigen in turn,can predict to have new tumor antigens with high affinity for MHC molecules;
5. Failure in conventional treatment， or though benefit from chemotherapy the patient can't tolerant subjectively;
6. Have an Eastern Cooperative Oncology Group (ECOG) performance status of =\< 2 and an anticipate life expectancy of at least three months,be cooperate to adverse reactions monitoring and therapeutic evaluation of the treatment;
7. Participants of child-bearing potential must agree to use adequate contraceptive methods up to 12 months after the pretreatment;
8. Serology：Seronegative for HIV antibody,seronegative for hepatitis C antibody. Hematology：Absolute neutrophil count ≥ 1000/mm(3) without the support of filgrastim ,WBC ≥ 3000/mm(3)，lymphocyte count ≥ 800/mm(3)，Platelet count ≥ 100,000/mm(3)，Hemoglobin ≥ 9.0 g/dl Chemistry：Serum ALT/AST ≤ 2.5 times the upper limit of normal，Serum Creatinine ≤1.6 mg/dl，Total bilirubin \< 1.5 mg/dl, except in patients with Gilbert s Syndrome who must have a total bilirubin \< 3.0 mg/dl;
9. Patients or their legal representatives are willing and able to understand and written informed consent form for the trial;

Exclusion Criteria:

1. Is pregnant or breastfeeding,or expecting to conceive;
2. Have a history of severe immediate hypersensitivity reaction to any of the agents used in this study.
3. Suffered grade 3-4 major organ immune-related adverse events after anti-PD1/PDL1 antibody treatment.
4. Once received allogeneic organ transplantation (including bone marrow transplantation and peripheral stem cell transplantation, except for corneal transplantation);
5. Have clinical symptoms of central nervous system metastases;
6. Have used a large number of glucocorticoids or other immunosuppressive agents within 4 weeks;
7. Have any active autoimmune disease ;
8. Be in active infection or undergo an unknown cause fever\> 38.5 ℃ during screening or before the first administration(except tumor fever which evaluated by the researchers have no effect to enrollment );
9. Received chemotherapy or small molecule targeted drug therapy in 4 weeks prior to chemotherapy pretreatment;
10. Received any antibody drug therapy (including PD-1 and CTLA-4) within 6 weeks before the treatment period;
11. Severe liver and kidney dysfunction or uncontrollable diabetes, hypertension and other chronic systemic diseases; severe coagulation disorders, mental illness, cardiopulmonary disease，hydrothorax or ascites;