This is a clinical study to observe the safety and feasibility of chimeric antigen receptor 19 (CART-19) cells in relapsed and refractory patients with CD19+ B cell lymphoma.

This is a study for the patients with B cell lymphoma. Subjects will be staged and the suitability of their T cells for CART-19 manufacturing will be determined at entry phase. Subjects will be collected their T cells and modify them, the modification is a genetic change, that CD19:4-1BB:CD3 modified T cells, in order to tells the T cells to recognize their target tumor cells and potentially kill them, but not other normal cells in the subject's body. The CART cells will then be expanded in vitro and then administered to subjects.

The purpose of this study is to assess ssess the safety and feasibility of CART-19 cells in the patients with relapsed and refractory CD19+ B cell lymphoma.

Inclusion Criteria:

1. 18 years to 70 years, expected survival > 3 months;
2. CD19 positive B-cell lymphoma;
3. KPS >80;
4. Having at least one measurable lesions;
5. Cardiac function: 1-2 levels; Liver: TBIL≤3ULN，AST ≤2.5ULN，ALT ≤2.5ULN; kidney: Cr≤1.25ULN; bone marrow: WBC ≥ 3.0×109/L, Hb ≥90 g/L, PLT ≥ 80×109/L）;
6. No serious allergic constitution;
7. No other serous diseases that conflicts with the clinical program;
8. No other cancer history;
9. No serious mental disorder;
10. Informed consent is signed by a subject or his lineal relation.

Exclusion Criteria:

1. Pregnant or lactating women; (female participants of reproductive potential must have a negative serum or urine pregnancy test);
2. Uncontrolled active infection, HIV infection, syphilis serology reaction positive;
3. Active hepatitis B or hepatitis C infection;
4. Recent or current use of glucocorticoid or other immunosuppressor;
5. With severe cardiac, liver, renal insufficiency, diabetes and other diseases;
6. Transaminase >2.5ULN, Bilirubin >3ULN，Creatinine>1.25ULN
7. Participate in other clinical research in the past three months; previously treatment with any gene therapy products;
8. Researchers think of that does not fit to participate in the study, or other cases that affect the clinical trial results;