Anti-CD19 CAR-T Therapy Combine With HSCT to Treat MRD+ B-cell Malignancies

Inclusion Criteria: 1. The patient is pathologically and histologically confirmed as CD19 + B cell tumors, and has no effective treatment options currently, such as chemotherapy or autologous hematopoietic stem cell transplantation (auto-HSCT); or patients voluntarily choose CD19 CAR-T cells as a first treatment; 2. The patient is MRD+ (\<10%) after at least two cycles of chemotherapies. 3. B cell hematological malignancies include the following three categories: * B-cell acute lymphocytic leukemia (B-ALL); * Indolent B-cell lymphoma (CLL, FL, MZL, LPL); * Aggressive B-cell lymphoma (DLBCL, BL, MCL); 4. \< 70 years old; 5. Expected survival time \> 6 months; 6. Female patients around childbearing age, negative pregnancy test before trial, and agreed to take effective contraceptive measures during the trial until the last visit; 7. Voluntarily participate in this experiment and sign informed consent by themselves, or legally authorized representative. Exclusion Criteria: 1. With a history of allo-HSCT; 2. With a history of epilepsy or other central nervous system diseases; 3. The presence of clinically significant cardiovascular disease, such as uncontrolled or symptomatic arrhythmias, congestive heart failure or myocardial infarction within recent six months, or heart disease with cardiac function in any grade 3 (moderate) or 4 ( severe) (according to the New York Heart Association (NYHA) Functional Classification System); 4. Pregnant or lactating women (safety of this therapy for the unborn child is unknown); 5. Not curable active infection; 6. Patients with active hepatitis B or hepatitis C virus infection; 7. Combined use of systemic steroids within two weeks (except use of inhaled steroid recently or currently); 8. Using product of gene therapy before; 9. Creatinine\> 2.5 mg / dl (221.0 umol/L); ALT / AST\> 3 X the normal amount; Bilirubin\> 2.0 mg / dl (34.2 umol/L); 10. Patients suffering from other uncontrolled diseases, and researchers believe that the patient is not suitable for trial; 11. Patients with HIV-infection; 12. Any situation that may increase the risk of patients or interfere with test results.